Hemal Electronics

TheArduino Leonardois a microcontroller board based on the AT32u4 . It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial and COM port. It also has other implications for the behavior of the board;

• OLED’s are the future of displays, as they possess some of the greatest advantages over both conventional display technologies of LCD’s and LED‘s.
• The most attractive thing about using the OLED displays is that they do not need a back-light like conventional LCD/LED screens. The organic material itself has a property known as Electroluminescence (EL), which causes the material to “glow” when stimulated by a current or an electric field. Best energy saving displays ever!!!
• They are featuring much less thickness than LCD displays with good brightness and also produce better and true colors. 
• This OLED Display Module is very compact and will add a great ever user interface experience to your Arduino project. The connection of this display with Arduino is made through the I2C(also called as IIC) serial or SPI interface.
• The 0.96″ OLED Display Module produces blue text on black background with very good contrast when supplied with DC 2.8V supply. The OLED Display Modules also offers a very wide viewing angle of about greater than 160°.
• Setting up SPI/I2C Connection with GMS096A OLED Module
• Being a new entry into the market, only limited resources are available on this small piece of a miracle (GMS096A). I2C/SPI configuration always demands helpful resources as in any case. For the SPI setup, the module comes in 4 wire SPI configuration by default and to make it work with the Arduino you can use these libraries from Adafruit.
• For the I2C setup, it demands a little bit of work on the module, let us start with resoldering the resistor from position R3 to R1 and then short the R8 resistor with some soldering tin (0 Ohm resistor). The R6 and R7 pullup resistors are already soldered, nothing to do there. Once done, the module is ready for I2C communication! The CS Pin is not necessarily needed, so just connect it to GND. The DC Pin selects the address. For standard address wire it to GND. The RES-pin needs a low pulse at startup and a high voltage during operation (as in SPI mode), a 100nF capacitor to GND and a 10k resistor to VCC would be ideal.

• No need of the backlight
• The display is self-illuminating
• Power requirement is low
• They are offering the large viewing angle
• Full Compatible with Arduino
• Factory configured for SPI protocol (can easily change to IIC)
• Better performance characteristics than traditional LCD and LED displays.
• Only Need 2 I/O Port Control

• The HC-05 Bluetooth module can work as a Bluetooth transmitter and receiver
• Easy to use with the Arduino

• Send Text Messages (SMS)
• Make or receive Phone calls
• Connect to Internet via GPRS
• TCP/IP

• Quad-band 850/900/1800/1900MHz - connect onto any global GSM network with any 2G SIM (in the USA, T-Mobile is suggested).
• Make and receive voice calls using a headset or an external 8Ω speaker and electret microphone.
• PWM/Buzzer vibration motor control
• AT command interface with "auto baud" detection
• Send and receive SMS messages.
• Send and receive GPRS data (TCP/IP, HTTP, etc.).
• Scan and receive FM radio broadcasts.
• Lead out buzzer and vibration motor control port.
• AT command interface with "auto baud" detection.
• Onboard IPEX socket that can be connected to external antenna.
• Breakouts for external 8W speaker and electret mic if you don't want to use a headphone
• Level shifting circuitry so you can run it with 2.8V to 5V logic.
• Vibrational motor (buzzer) driver so you can have noiseless notifications
• uFL or SMA connections for external antenna
• Indicator LEDs for power and network connectivity
• Standard SIM slides into the back

This module can take an input voltage of between 5 and 32V DC and converts it to an output voltage between 5 and 35V DC. You may use this module to generate high voltage upto 32V from small battery packs other power sources.

Features:

• Built-4A efficient MOSFET switches enable efficiency up to 94%; (LM2577 current is 3A)
• High switching frequency 400KHz, can use a small-capacity filter capacitors that can achieve very good results, the ripple smaller and smaller. (LM2577 frequency only 50KHz)

• Input 3V Output 12V 0.4A 4.8W (input voltage less than 5V not recommended)
• Input 5V Output 12V 0.8A 9.6W
• Input 7.4V Output 12V 1.5A 18W
• Input 12V Output 15V 2A 30W
• Input 12V Output 16V 2A 32W
• Input 12V Output 18V 1.6A 28.8W
• Input 12V Output 19V 1.5A 28.5W
• Input 12V Output 24V 1 A 24W

• Vin Input Voltage
• Iin Input current
• Vout Output Voltage
• Iout Output current

• Module Properties Non-isolated boost (BOOST)
• Rectification Non-Synchronous Rectification
• Input Current 4A (max), no-load 18mA (5V input, 8V output, no-load is less than 18mA. Higher the voltage, the greater the load current.)
• Conversion efficiency <94% (greater the pressure, the lower the efficiency)
• Output Ripple 50mV (the higher the voltage, the greater the current, the greater the ripple)

The Arduino Pro Mini is a microcontroller board based on the ATmega328. 
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers. A six pin header can be connected to an FTDI cable or Sparkfun breakout board to provide USB power and communication to the board.

The Arduino Pro Mini is intended for semi-permanent installation in objects or exhibitions. The board comes without pre-mounted headers, allowing the use of various types of connectors or direct soldering of wires. The pin layout is compatible with the Arduino Mini. There are two version of the Pro Mini. One runs at 3.3V and 8 MHz, the other at 5V and 16 MHz.  The Arduino Pro Mini was designed and is manufactured by SparkFun Electronics. You can find here your board warranty informations.

• You can find in the Getting Started section all the information you need to configure your board, use the Arduino Software (IDE), and start tinker with coding and electronics.

The LilyPad 328 ATmega328P Main Board 16M is an Arduino-program micro-controller design to be easily integrated into e-textiles and wearable projects. It offers the same functionality you find in other Arduino boards, in a lightweight, round package design to minimize snagging and profile. With wide tabs that can be sewn down and connect with conductive thread.

The LilyPad Arduino consists of an ATmega328 with the Arduino bootloader and a minimum number of external components to keep it as small (and as simple) as possible. This board will run from 2V to 5V and offers large pin-out holes that make it easy to sew and connect. Each of these pins, with the exception of (+) and (-), can control an attached input or output device (like a light, motor, or switch). Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They’re even washable!.

• The latest version of the LilyPad supports automatic reset for even easier programming.
• The back side of the LilyPad is now completely flat!
• We now use a surface mount programming connector to keep the header from poking through.
• This version of the LilyPad now uses the new ATmega328 at 8MHz.
• Use this setting when using this new LilyPad 328.

• 1 x LilyPad 328 ATmega328P Main Board 16M

This Oled Display Screen Module offers, They are featuring much less thickness than LCD displays with good brightness and also produce better and true colors. 

This Oled Display Module is very compact and will add a great ever user interface experience to your Arduino project. The connection of this display with Arduino is made through SPI interface.

The Oled Display Screen Module produces blue text on black background with very good contrast when supplied with supply. The Oled Display Modules also offers a very wide viewing angle of about greater than 160°.

• No need of the backlight
• The display is self-illuminating
• Power requirement is low
• They are offering the large viewing angle
• Full Compatible with Arduino
• The ultra-low power consumption of around 0.08w at full screen lit.

• 1 xDRV8825 stepper motor driver.

• Simple step and direction control interface
• Six different step resolutions full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step
• Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor's rated voltage to achieve higher step rates
• Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay)
• Built-in regulator (no external logic voltage supply needed)
• Over-temperature thermal shutdown, over-current shutdown, and under-voltage lockout
• Short-to-ground and shorted-load protection
• 4-layer, 2oz copper PCB for improved heat dissipation
• Exposed solderable ground pad below the driver IC on the bottom of the PCB
• Module size, pinout, and interface match those of ourA4988 stepper motor driver carriersin most respects (see the bottom of this page for more information)

Arduino Uno is a microcontroller board based on the Atmega 328PIt has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.. You can tinker with your UNO without worring too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.

"Uno" means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved to newer releases. The Uno board is the first in a series of USB Arduino boards, and the reference model for the Arduino platform; for an extensive list of current, past or outdated boards see the Arduino index of boards.

• You could download the driver of Elegoo Nano V3.0
• The Nano is using the chips ATmega328P and CH340, not FT232 as official Arduino, so pls. use the driver from above link.
• It is a smallest, complete, and breadboard friendly board. It has everything that Diecimila/Duemilanove has (electrically) with more analog input pins and onboard +5V AREF jumper.
• Nano's got the breadboard-ability of the Boarduino and the Mini+USB with smaller footprint than either, so users have more breadboard space. It's got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other).
• The Nano can be powered via the Mini-B USB connection, unregulated external power supply (pin 30), or regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.

This is a cheap and easy to use RF wireless transceiver module based on the popular nRF24L01 from Nordic Semiconductor. It works at the 2.4 GHz frequency range and has a high on air data rate of upto 1 - 2 Mbps and comes with an onboard antenna for best performance maintaining a small size factor. This is one the cheapest and easiest modules to do wireless communications using Arduino, Raspberry Pi and other micro controllers. Libraries and sample codes are available for Arduino and Raspberry Pi which will make it easier for you to start using the wireless module.

Use it to do bidirectional communication between devices. It has a standard SPI interface, which means you can directly interface this module to any microcontroller without the need for any external circuit.

This RF transceiver is perfect to making wireless robots, home automation, wireless transmission of audio and video, etc.

Features

• Based on the popular nRF24L01 from Nordic Semiconductor
• Supports SPI interface, which allows easy interface with microcontrollers
• Onboard antenna for optimum performance
• When working with datarate of 2Mbit/s, the peak.
• Standard DIP type pinout for easy Interface through jumper wires or breadboard
• Applications: wireless peripherals, remote control systems such as RC vehicles and consumer remote electronics, wireless voice transmission such as VoIP, wireless sensor networks, wireless networks, home and commercial automation

Additional Information:

• Pay Mode Terms: T/T (Bank Transfer)

The Nano 328P Expansion Adapter Breakout Board IO Shield acts as a breakout board for the Arduino Nano microcontroller. There are several different options for power input and the footprint of this board is the same as the Arduino Duemilanove.

In addition, each pinout includes 5V and GND pins for easy connection to sensors or servos. The unit comes fully assembled. Arduino Nano IO Expansion Shield is specifically designed to facilitate an easy connection between  Arduino Nano and many other devices. In essence, it expands the Arduino Nano controller to link those devices in a simple and trouble-free manner. It is a perfect companion of Nano breadboard and compatible with both Arduino Nano v2.x and v3.x.

•  I/O Pin (servo type with GND, power, and signal)
• analog Pin with power output and GND.
• PWM Pin
• Servo power input
• I2C expansion Pin
• AREF output

You can use this module with Arduino Nano, to buy them click on the name below

Features:

• Compatible with Arduino NANO.
• All digital and analog pins breakout.
• Compact size.
• External power supply current support.
• Leads  all pins out, convenient for wiring and doing experiments.

• This 37pcs Sensors Kit for Arduino is supplied with the variety of sensors which are compatible with Arduino Boards. This is the most complete performance starter kit with all the essential Arduino sensors.
• It comprises 37 Pcs essential Arduino components. The kit includes the latest Arduino components that can be used to turn your idea into a real product.
• Tons of updated lessons and Arduino codes are available on google and youtube for free. It is extremely easy for Arduino fancier to control and use these modules. This kit will help you control the physical world with sensors.

The TM1637 4 Digits 7 Segment Led Display Module with Clock for Arduino is an affordable solution for displaying the output data of your Arduino project. Though the data displayed is restricted by numbers still it allows users to display some characters too like A, B, C etc.

This 7 segment LED Display has 4 digits which are controlled by TM1637 Driver Chip. It requires only two connections to control this TM1637 4 Digits 7 Segment Led Display Module. Also thanks to the I2C Bus you can control it using only 2 wires, leaving more pins available on your MicroController to connect other things.

The module is a 12-foot clock with four common anode tube (0.36 inch) display module for driver IC TM1637, only two signal lines can make the MCU control four 7-segment digital tubes.

.

Pinout Description of TM1637 4 Digits 7 Segment Led Display Module with Clock for Arduino :-

LED Display module to Arduino

• GND    –    GND
• Vcc      –    5V
• DIO     –     D2
• CLK     –     D3

Features of TM1637 4 Digits 7 Segment Led Display Module with Clock for Arduino:-

• Ease to use.
• Ease of multiplexing.
• Can use as a 4 digit display unit.
• Can use as a clock display.
• DIY clock project.
• 4 digit display unit.
• Electrical/Electronic projects.
• The counter project using 7 segment display.
• 4 M2 screws positioning holes for easy installation

Package Includes:-

• 1 x TM1637 4 Digits 7 Segment Led Display Module with Clock for Arduino.

DC-DC boost converters step up the input voltage to a higher voltage while also stepping down the available current since the module cant output more power than its inputs.

This boost converter is adjustable and capable of outputting a voltage in the range of 5.0 to 28V at a continuous current of up to 1.5A depending on input/output voltage settings with 1A available with most settings.

Since it is a boost converter, the input voltage must be lower than the output voltage.

The device is able to use low ESR bulk ceramic capacitors rather than electrolytic caps which avoids long-term aging concerns and contributes to the compact packaging.

The MT3608 converter IC has over-current and thermal limiting features built-in to safely shut the device down if driven too hard.

The module has a single-turn potentiometer for adjustment of the output voltage.

Turning the pot CW decreases the output voltage while turning it CCW increases the output voltage.

The upper limit of the adjustment range will depend on the input voltage and the load. With a 9V input for instance, at 1A, the upper voltage limit will be approximately 20V.

These are compact boards with 4 solder pads for making connections.

1. VIN+ = Input Voltage
2. VIN- = Ground
3. VOUT+ = Output Voltage
4. VOUT- = Ground. Connected to VIN- on the module.

• The input voltage should not exceed the maximum input voltage.
• Peak current output current is not more than 2A for input & output.
• Please be noted that the output voltage should be higher than the input voltage.

1. Its efficient by up to93%.
2. It can source a good amount of current.
3. It is an inexpensive converter module.
4. Its simple to adjust to get your desired increase in voltage.

XL4015 module is a 180 KHz fixed frequency PWM buck (step-down) DC/DC module,capable of driving a 0-5A (Max) Adjustable load with high efficiency, low ripple and excellent line and load regulation. Use as a step-down modules with overcurrent protection capabilities.

This module has adjustable output Voltage and Current. Can also be used as a dedicated charger for Lithium Batteries (Li-Ion,LiPo) as it is capable of CC CV

Specifications:-

• Input voltage range???4???38VDC(Note:input voltage not exceeding 38V)
  
• Output voltage range???1.25-36VDC adjustable
  
• Output current: 0-5A
  
• Output power: 75W
  
• High efficiency up to 96%
  
• Built in thermal shutdown function
  
• Built in current limit function
  
• Built in output short protection function
  
• Input reverse polarity protection: None (if required, high current diode in series with the input).
  
• L x W x H = 5.4*2.3*1.5 CM
  

Features:-

The DC/DC buck module applications the input voltage is higher than the output voltage of the buck field, such as battery, power transformer, DIY adjustable regulated power supply, LCD Monitor and LCD TV???portable instrument power supply???telecom/networking equipment,24V vehicle notebook power supply,industrial equipment buck.

12V buck to 3.3V, 12V buck to 5V,  24V buck to 5V,24V buck to 12V,  36V buck to 24V etc.

PCF8591 Module Features:-

• The module supports external voltage input of the 4-way acquisition (voltage input range of 0-5v)
• The module integrated photoresistor by AD collection precise value of the ambient light intensity
• Module integrated thermistor by the precise value of the ambient temperature of the AD acquisition
• Module integrated 1 channel 0-5V voltage input acquisition (the blue potentiometer to adjust the input voltage)
• Modules with power indicator (for the module power supply indicator lights)
• Modules with DA output indicator, when the module DA output interface voltage reaches a certain value, will be lit panel the DA output indicator, the higher the voltage, the more obvious indicator brightness
• Module PCB size: 3.6cm x 2.3cm
• A standard double panel, thickness 1.6mm, nice layout, surrounded by a through-hole, aperture: 3mm, convenient fixed.

PCF8591 IC Features:-

• Single power supply
• A PCF8591 operating voltage range of 2.5V-6V
• Low standby current
• Via I2C bus serial input/output
• PCF8591 by 3 hardware address pins addressing
• PCF8591 I2C bus speed sampling rate decided
• 4 analog inputs programmable single-ended or differential input
• Automatic incremental channel selection
• PCF8591 analog voltage range from VSS to VDD
• PCF8591 built-in track-and-hold circuit
• 8-bit successive approximation A / D converter
• 1 analog output DAC gain

• AOUT chip DA output interface
• AINO chip analog input interface 0
• AIN1 chip analog input interface 1
• AIN2 chip analog input interface 2
• AIN3 chip analog input interface 3

• SCL – IIC clock interface connected to microcontroller IO port
• SDA – IIC digital interface connected to microcontroller IO port
• GND – connected to ground
• VCC – connected to 3.3v-5v

• P4 – connected to P4 shorting cap, select thermistor access circuit
• P5 – connect P5 shorting cap, select photoresistor access circuit
• P6 – connected to P6 shorting cap, select 0-5V adjustable voltage access circuit

DS3231 Module is a Bread Board friendly extremely precise I2C real time clock Module. This module made using DS3231 RTC and AT24C32 EEPROM integrated with temperature compensated crystal oscillator. It also has a built in comparator which monitors the status of VCC to detect power failures and to automatically switch to backup power supply. AT24C32 provides 32,768 bits of serial EEPROM organized as 4096 words of 8 bits each. This gives you 32Kb of non-volatile memory for your projects. This module can be easily interfaced with Arduino Boards, Raspberry Pi and all Microcontrollers.

Features:-

• Size: 38mm (length) * 22mm (W) * 14mm (height)
• Weight: 8g
• Operating voltage :3.3 – 5 .5 V
• Clock chip: high-precision clock chip DS3231
• Clock Accuracy :0-40 ??? range, the accuracy 2ppm, the error was about 1 minute
• Calendar alarm clock with two
• Programmable square-wave output
• Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation
• Chip temperature sensor comes with an accuracy of ± 3 ???
• Memory chips: AT24C32 (storage capacity 32K)
• I2C bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)

The ATtiny85 based mini development board is similar to the Arduino, but cheaper and smaller (of course a bit less powerful). With a whole host of shields to extend its functionality and the ability to use the familiar Arduino IDE, this ATTINY85 USB Development Board is a great way to jump into microcontroller electronics.

ATtiny85 based microcontroller development board come with the USB interface. Coding is similar to Arduino, and it uses the familiar Arduino IDE for development. This is a digispark clone.

It has 6 port with several functions. Depending on the programming (with Arduino IDE) can it have 6 digital I/O, 4 analog inputs or 3 PWM outputs. It can be powered by a USB port or an external power supply of 6-35V DC.

1. Support for the Arduino IDE 1.0 + (OSX/Windows/Linux).
2. Power via USB or External Source or 7-16 v to 5 v (automatic selection).
3. The On board, 150 ma 5 v Regulator.
4. Built in USB and serial was debugging).
5. 6 I/O Pins (2 inform the for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).
6. 8 k Flash Memory (about 6 k after bootloader).
7. The I2C and SPI (vis USI).
8. PWM on 3 pins (more possible with Software PWM).
9. The ADC on 4 pins.
10. The Power LED and the Test/Status leds.

1 xATTINY85 USB Development Board

This is DC-DC Step Up SX1308 Adjustable Power Supply 28V 2A 1.2Mhz Power Booster Module. SX1308 booster module carrying SX1308 chip, its packaging is small, and high efficiency. The output power can be adjusted, maximum can arrive 28V and its interior integrate the lowest RDS internal resistance 100m metal oxide semiconductor field effect transistor (MOSFET), which can realize large current output of up to 2A.

It widely used in 3G network products, digital products, mobile power supply, battery power supply, equipment, etc.

1. Oscillation frequency 1.2MHz
2. efficiency is as high as 95%
3. The circuit has short circuit protection, overheating protection function
4. 10k to adjust potentiometer, adjust the output voltage

1 x DC-DC Step Up SX1308 Adjustable Power Supply 28V 2A 1.2Mhz Power Booster Module

Transparent Acrylic Case Shell Enclosure Gloss Box For Arduino Uno R3 is of high-grade acrylic, which provides excellent protection. This is unique design provides an easy connection to other components. The dimension of the enclosure box is the same as the original Arduino Uno R3. Note: The UNO R3 module is not included.

Package Includes:

• 1 x Transparent Acrylic Case Shell for Uno R3 Board Module Arduino.

Features:

• Material: A grade acrylic sheet.
• For Arduino UNO R3 Development Board only.
• With screw copper pillar and installation instructions.
• To protect your little computer against damages, dust and scratches Clear Top and Bottom.
• This case provides easy access to all ports.
• It requires no tools for easy assembly and disassembly.
• Simply Clicks Together Enclosure.

Features:

• 8 Bits, 8 keys, 8 LEDs, 8 digital tubes, common cathode LED digital tube
• TM1638 Chip, this module gathers more than three common SCM peripheral circuits.

Package List:

• 1 x TM1638 GPIO Expansion Demo Board

This is the antenna for GSM Modems. A small, high-quality, quad-band, standard SMA terminated, cellular antenna. Has a length of 2 inches.

• Bluetooth protocol: Bluetooth Specification V4.0 BLE
• Modulation: GFSK (Gaussian Frequency Shift Keying)
• Sensitivity: ≤-84dBm at 0.1% BER
• Safety features: Authentication and encryption
• Support Services: Central & Peripheral UUID FFE0, FFE1
• Bluetooth Certification: Rohs Reach

The MPLAB PIC kit 3 allows debugging and programming of PIC and dsPIC Flash microcontrollers at a most affordable price point using the powerful graphical user interface of the MPLAB Integrated Development Environment (IDE). The MPLAB PIC kit 3 is connected to the design engineer's PC using a full speed USB interface and can be connected to the target via an Microchip debug ICSP connector (compatible with MPLAB ICD 2, MPLAB ICD 3 and MPLAB REAL ICE).

• USB (Full speed 12 Mbps interface to host PC)
• Real-time execution
• MPLAB IDE compatible (free copy included)
• Built-in over-voltage/short circuit monitors
• Firmware upgradeable from PC/web downloads
• Totally enclosed
• Diagnostic LEDs (power, busy, error).
• Read/write program and data memory of microcontroller
• Erase of program memory space with verification
• Freeze-peripherals at breakpoint.
• Program up to 512K byte flash with the Programmer-to-Go

Package Contents:

• PIC KIT 3
• USB cable
• 6 Pin FRC cable

Micro SD Card Reader Module also called Micro SD Adaptor is designed for dual I/O voltages. This Module is a simple solution for transferring data to and from a standard SD card. The pinout is directly compatible with Arduino, but can also be used with other microcontrollers. This module has SPI interface which is compatible with any sd card and it use 5V or 3.3V power supply which is compatible with Arduino UNO/Mega.SD module has various applications such as data logger, audio, video, graphics.

Features:-

• Support Micro SD Card (<=2G), Micro SDHC card (<=32G) (high-speed card)
  
• The level conversion circuit board that can interface level is 5V or 3.3V
  
• Power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board
  
• Communication interface is a standard SPI interface
  
• 4 M2 screw positioning holes for easy installation
  
• Size: 4.1 x 2.4cm

1. 1 channel relay module.
2. One normally closed contact and one normally open contact.
3. High impedance controller pin.
4. Default High-level trigger.
5. Pull-down circuit for the avoidance of malfunction.
6. Power supply indicator lamp.
7. Can be controlled various appliances & other Equipment With Large current.
8. Standard TTL Level logic controlled.
9. The module is compliant with international safety standards.
10. With 4 fixed screw holes, hole diameter 3.1mm, convenient installation, and fixation.

The turbidity of water refers to the degree of turbidity caused by suspended substances such as silt, clay, organic matter, plankton and microorganisms contained in the water. Industrial-grade turbidity sensors or turbidity meters are expensive, and the cost is too high in the design of electronic products. Therefore, we have selected a turbidity sensor that is widely used in household appliances, washing machines, and dishwashers. The sensor uses optical principles to comprehensively judge the turbidity through the light transmittance and scattering rate in the solution. Inside the sensor is an infrared tube. When light passes through a certain amount of water, the amount of light transmission

depends on the degree of dirtiness of the water. The dirtier the water, the less light it transmits. Light

The receiving end converts the intensity of the transmitted light to the corresponding current size. The transmitted light is more and the current is larger. On the contrary, the transmitted light is less and the current is smaller.

The turbidity sensor module converts the current signal output by the sensor into a voltage signal and performs AD conversion data processing through the single-chip microcomputer. The re-modelling module has analogue and digital output interfaces. The analogue quantity can be sampled and processed by the single-chip A/D converter to know the current water pollution. The digital value can be adjusted through the potentiometer on the module to adjust the trigger threshold. When the turbidity reaches the set threshold, the D1 indicator will be lit, the output of the sensor module changes from high level to low level, and the single-chip monitors the change in level To determine whether the turbidity of the water exceeds the standard, so as to warn or link other equipment. The module is inexpensive, easy to use, and has a high measurement accuracy

It can be used to measure the degree of water pollution of products such as washing machines and dishwashers; it can also be used in industrial field control, environmental sewage collection and other occasions that require turbidity detection and control.

The composition of the turbidity sensor module is shown below. The module is connected to the turbidity sensor through the 3Pin XH-2.54 connector. Adjust the knob of 10K blue potentiometer to adjust the trigger threshold of digital output.

The module pin definitions are as follows:

1. VCC: Positive supply voltage, 5V cannot be used 3.3V
2. AO: analogue signal output, output voltage range 0~5V
3. DO: digital signal output is less than the set value and outputs high level; greater than the set value and outputs low level
4. GND: negative supply voltage

1. Working voltage: 5.00V DC
2. Working current: 40mA (MAX)
3. Response time: <500ms
4. Insulation resistance: 100M (Min)
5. Analog output: 0~4.5V
6. Digital output: high/low level signal (the corresponding threshold can be selected by adjusting the potentiometer)
7. Operating temperature: -20~90
8. Module size: 38.6mm x 22.1mm

• Voltage upto 250 volts can be measured
• Light weight with on-board micro-precision voltage transformer
• High precision on-board op-amp circuit 
• Operating temperature : 40ºC ~ + 70ºC
• Supply voltage 5 volts to 30 volts

• Analog output corresponding quantity can be adjusted.
• Pcb board size : 49.5 (mm) x19.4 (mm)
• Good consistency, for voltage and power measurement 
• Very efficient and accuracy

• RAMPS can only work when connected to its motherboard Mega 2560 and A4988/DRV8825. Owning to its stability in operation and great compatibility with the most 3D printer (all RepRap-model such as Prusa i2 and i3). The combination of Ramps1.4 + MEGA2560 + A4988/DRV8825 is becoming a mainstream of DIY 3D printer control board.
• The modular design includes the plug in stepper drivers and extruder control electronics on an Arduino MEGA shield for easy service, part replacement, upgrade-ability, and expansion. Additionally, a number of Arduino expansion boards can be added to the system as long as the main RAMPS board is kept to the top of the stack.
• Additionally, a number of Arduino expansion boards can be added to the system as long as the main RAMPS board is kept to the top of the stack. Ramps boards are the heart of most DIY 3D printers on the market and a nice clean compact way to integrate all the systems into a compact enclosure mountable format.

• Standard interfaces (as that of the extruder)
• Reserved GCI like I2C and RS232
• MOSFET 3 MOSFET is applied to the heater/ fan and thermistor circuit.
• Another 5A added to protect the component parts.
• An 11A fuse is added to the hotbed.
• Support 5 stepper drive board
• The adoption of Pin Header as Pololu makes it more convenient to repair or change.
• I2C and SPI are reserved for expanding
• All the MOSFET can be controlled by PWM
• Use the interface of the servo motor to adjust the level of the printing platform automatically.
• Adding an SD module for SD ramps module.
• LED can indicate the status of the heater (the open and close of MOS).
• Expandable to control other accessories.
• Pololu boards are on pin header sockets so they can be replaced easily or removed for use in future designs.
• 2 stepper motor for Z axis in parallel.

• 1 x RAMPS 1.4 board, assembled.
• 15 x Step mode selection jumpers.
• 1 x 4-pin male power connector.