4 CHANNEL RELAY BOARD

Quad Channel Relay Board is a simple and convenient way to interface 4 relays for switching application in your project.

FEATURES

  • Input supply 12 VDC @ 170 mA
  • Output four SPDT relay
  • Relay specification 5 A @ 230 VAC
  • Trigger level 2 ~ 5 VDC
  • Berg pins for connecting power and trigger voltage
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for easy relay output and aux power connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 88 mm x 68 mm

Applications: Robotics, Electronics projects, Industrial controls, Microwaves Oven, Fans, DC Motor, AC Lamp, Solenoids Remote Controls etc.

RELAY LOAD (CONTACT CAPACITY OF RELAY)

  • 7 A @ 230-250 VAC
  • 10 A @ 120 VAC
  • 10 A @ 24 VDC
  • CN1 – CN4 Connector : Relay 1 to 4 (S1 to S4) Output (Normally Open/Normally Close)
  • CN5 Connector : Control Signal Input, Trigger 2 to 5 VDC and Supply Input 12 VDC
  • D2,D4,D6,D8 : Relay On/Off LED Indication
  • CN6 Connector : Axillary Supply 12 VDC

SCHEMATIC

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PARTS LIST

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CONNECTION

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PCB

ONE CHANNEL INFRARED REMOTE CONTROLLER

One Channel Infra-Red Remote and receiver with onboard Relay provides normally open and normally closed output. The project based on PIC12F683 Microcontroller from Microchip , TSOP1738 used as Infra-Red receiver. Micro-controller decodes the RC5 serial data coming from TSOP1738 and provides high output if the data is valid. The output can be set Momentary or Latch using on board Jumper (J1) and closure. The board provided with 3 LEDs, Power LED, Valid Transmission LED and Output LED. This Remote works with switch No1 of RC5 Remote.

FEATURES

  • Power Supply Remote  2X AA Batteries
  • Power Supply Receiver  7-12V DC
  • Current Consumption Receiver 30mA
  • Onboard jumper for momentary and latch operation selection
  • Transmitter range 10-15 feet
  • RC5 (Philips) Remote
  • Onboard power LED
  • Onboard output ON/OFF  LED
  • Onboard Valid Transmission LED
  • Onboard 5V regulator
  • PCB Dimensions 59.06 MM X 29.53 MM

SCHEMATIC

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PARTS LIST

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PCB

HEAT ACTIVATED COOLING FAN CONTROLLER

Heat-activated cooling fan controller is a simple project which operates a brushless fan when the temperature in a particular area goes above a set point, when temperature return normal, fan automatically turns off. The project is built using LM358 Op-amp and LM35 temperature Sensor. Project requires 12V DC supply and can drive 12V Fan. This project is useful in application like Heat sink temperature controller, PC, heat sensitive equipment, Power supply, Audio Amplifiers, Battery chargers, Oven etc

The SMD SO8 LM35 used as temperature sensor, LM358 act as comparator and provides high output when temperature rise above set point, high output drive the Fan through driver transistor. The LM35 series are precision integrated-circuit temperature devices with an output voltage linearly-proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracy of ±¼°C at room temperature. Temperature sensing range 2 to 150 centigrade. LM35 provides output of 10mV/Centigrade.

FEATURES

  • Supply 12V DC 1Amps
  • Fan 12V DC , 500mA
  • Range : 2 °C to 150 °C
  • Open Collector Output
  • It can drive PC fan
  • Onboard preset to set the Fan trigger level
  • Onboard Power LED
  • Onboard Output LED
  • Output Driver Transistor
  • Header Connector for Supply and Fan
  • PCB dimensions 59.85 mm x 12.70 mm

SCHEMATIC

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PARTS LIST

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CONNECTION

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PHOTOS

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4 CHANNEL RF REMOTE CONTROLLER

4 Channel RF remote built using PT2262 and PT2272-M4 IC from Princeton technology. PT2262 used as Encoder (Transmitter) and PT2272-M4 Decoder (Receiver) ICs are heart of the project. The receiver provides 4 channel Momentary outputs. All outputs are TTL level can be interface with other circuits or relay board. Transmitter works with 5V to 12V DC. Receiver works with 5V DC.

When any of SW1-SW4 (S1-S4) tact switch is pressed the, power is applied to encoder IC and RF transmitter module, the encoder then starts scanning Jumper J1-J8 and transmitting the status of the 8 bits address and data serially. The decoder IC receives the data and compares two times with J1-J8 address jumpers and provides outputs high and also VT LED goes On, if the data is Valid and address of Transmitter and Receiver are same. It is important to have same jumper settings J1-J8 at transmitter and receiver to pair both. Multiple remote can be used to control devices at same location by changing the address codes. All address is Tri-State and offers 6561 combinations.

Encoder – Transmitter (PT2262)

PT2262 is a remote control encoder paired with PT2272 utilizing CMOS technology. Its encode data and address pins into a serial coded waveform suitable for RF modulation. Circuit uses 8 bits of tri-state address pins providing up to 6561 address codes, thereby, drastically reducing any code collision and unauthorized code scanning possibilities.

PT2262 encodes the code address and data set into special waveform and outputs it to the DOUT when TE is pulled to low. The wave is fed to RF modulator (ASK RF TX Module) for transmission. The transmitted radio frequency is received by RF demodulator (ASK RF RX Module) and reshaped to special waveform. PT2272 is then used to decode the waveform and set the corresponding output pins. Thus completing a remote control encoding and decoding function.

Decoder Receiver (PT2272-M4)

PT2272 decodes the waveform received and fed in to the DIN pin. The waveform is decoded into code word that contains the address, data and sync bits. The decoded address bits are compared with the address set at the address input pins. If both address match for 2 consecutive code words, PT2272 drives the data output pins whose corresponding data bits is the decoded to be a 1 bit, and (2) the VT output — to high state.

VT (Valid Transmission)

When PT2272 receive a transmission code word, it initially checks weather this is a valid transmission. For a transmission to be valid, (1) it must be complete code word, and (2) the address bits must match the address setting at the address pins. After two consecutive valid transmission, PT2272 (1) drives the data pins according to the data bits received, and (2) raises VT to high state.

NOTE : Jumper J1 to J8, To set High Jumper provided at Bottom layer of PCB, Jumpers and closure provide to set low, don’t use any of these for floating.

FEATURES

  • Wide Range of Operation Voltage 5V to 12V Transmitter
  • Supply 5V DC Receiver
  • On Board Data Transmission LED
  • Single Resistor Oscillator
  • 4 Momentary Outputs
  • 4 Outputs TTL Level
  • Address setting 3 states HIGH, LOW, And FLOATING)
  • Remote provides 6561 addressable combinations by setting up J1-J8 to High, Low, and Floating.
  • On Board Power and Valid Transmission LEDS Receiver
  • ASK Modulation
  • RF link work on 433.92 MHz Frequency
  • CMOS Technology
  • Low Power Consumption
  • Very High Noise Immunity
  • Up to 8 Tri-State Code Address Pins
  • PCB Dimensions Transmitter 36MM X 26.67MM
  • PCB Dimensions Receiver 45.40 MM X 26.67

APPLICATION

  • Car Security System
  • Garage Door Controller
  • Remote Control Fan
  • Home Security
  • Automation System
  • Remote Toys
  • Robots
  • Remote Control for Industrial Use

SCHEMATICS

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4-Channel-RF-Remote-Controller-TX-SCHEMATIC

PARTS LIST

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4-Channel-RF-Remote-Controller-BOM-TX

WIRING DIAGRAM

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PHOTOS

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PCB

PWM SOLENOID AND VALVE DRIVER USING DRV103

This tiny module is a PWM Solenoids and Valves driver using Texas instrument’s DRV103 low-side DMOS power switch employing a pulse-width modulated (PWM) output. Its rugged design is optimized for driving electromechanical devices such as valves, solenoids, relays, actuators, motors and positioners. This board is also ideal for driving thermal devices such as heaters, coolers, lamps etc. PWM operation conserves power and reduces heat rise, resulting in higher reliability. In addition, adjustable PWM allows fine control of power delivered to the load. Output delay time and oscillator frequency are also externally adjustable.

The DRV103 can be set to provide a strong initial closure, automatically switching to a “soft” hold mode for power savings. A resistor, analog voltage, or Digital-to-Analog(D/A) converter can control the duty cycle. An output OK flag indicates when thermal shutdown or over current occurs.

Solenoid-driver-PIC

FEATURES

  • Supply 8V to 32V DC
  • Load Capacity 1.5A
  • Trigger Input Voltage 1.5V to 5V DC
  • Thermal and Current Limit Shutdown
  • On-Board Power LED

APPLICATIONS

  • Solenoids
  • Valves
  • Heaters, Coolers
  • Lamps
  • Relays
  • Power Contactor Coils
  • Hydraulics and Pneumatics Systems

Note: PWM Duty Cycle, Output Delay, Frequency Adjust

  • Oscillator Frequency range 500Hz to 100Khz, the default set to 5Khz, Frequency can be altered by changing  R4 ( Refer to Datasheet for more details)
  • Delay Output: Default delay set to approx. 100mili seconds, Delay can be adjusted by changing Capacitor C1
  • Duty Cycle is adjustable 10% to 95% , the default set to 95% can be altered by changing R3 (Refer to Datasheet for more details)

SCHEMATIC

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PARTS LIST

PHOTOS

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MEASUREMENTS

Vout on the solenoid. We see that goes ON and after some time it starts PWM production to retain the ON state but with lower dissipated power and thermal stress.

VIDEOS

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4 CHANNEL LARGE CURRENT RELAY BOARD

4-Channel Relay Board is a simple and convenient way to interface 4 relays for switching application in your project. The project has large Relay which can switch current up to 20Amps.

SPECIFICATIONS

  • Input supply 12 VDC @ 360 mA
  • Output four SPDT Relay
  • Relay specification 20 A @ 230 VAC NC/30A NO
  • Trigger level 2 ~ 5 VDC
  • Box Header connector for connection of trigger signal
  • LED on each channel indicates relay status
  • Power-On LED indicator
  • Screw terminal connector for easy relay output and power in connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 65 mm x 116 mm

SCHEMATIC

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PARTS LIST

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PHOTOS

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LARGE CURRENT RELAY WITH DUAL OUTPUT DC-DC CONVERTER FOR HOBBY CNC/ROUTER

Single Channel Large current relay board with dual DC-DC converter board is mainly designed for Hobby CNC, Routers, and Plasma cutters.

Hobby CNC controller requires multiple DC outputs to drive various things.  This board provides 5V DC and 12V DC 1Amp each. The dual supply helps driving LPT breakout board, Sensors, Limit switches and few other things that require 5V and 12V.

The Relay has large current handle capacity and can be used to drive spindles, solenoids, and other things that require switching. The relay requires TTL High signal to trigger or it has the capability to even trigger with GND signal.

FEATURES

  • Supply Input 15V to 35V DC
  • DC Outputs 5V @ 1A & 12V 1A
  • On Board LED for Relay Output
  • Relay Contact 20Amp NC and 30 Amps No 230V AC
  • Relay Trigger 5V TTL in or GND input
  • Screw Terminal and 2 Pin Header Connector Provided for Supply Input
  • Screw Terminal and 2 pin header provided for 5V DC & 12V DC Output
  • 3 Pin Screw Terminal Provide for Relay output Connections NO/NC
  • 3 Pin Header Connector for TTL + Signal Trigger, and Low GND signal Trigger
  • Close The Jumper to trigger rely with low GND signal input

SCHEMATIC

large-current-relay-schematicPARTS LIST

large-current-relay-bom

PHOTOS

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large-current-relay-m119-500x500PCB

+9V TO 60V PWM 2.3A SOLENOID VALVE DRIVER USING DRV101

The DRV101 is a low-side power switch employing a pulse-width modulated (PWM) output. Its rugged design is optimized for driving electromechanical devices such as valves, solenoids, relays, actuators, and positioners. The DRV101 module is also ideal for driving thermal devices such as heaters and lamps. PWM operation conserves power and reduces heat rise, resulting in higher reliability. In addition, adjustable PWM potentiometer allows fine control of the power delivered to the load. Time from dc output to PWM output is externally adjustable. The DRV101 can be set to provide a strong initial closure, automatically switching to a soft hold mode for power savings. Duty cycle can be controlled by a potentiometer, analog voltage, or digital-to-analog converter for versatility. A flag output LED D2 indicates thermal shutdown and over/under current limit. A wide supply range allows use with a variety of actuators.

FEATURES

  • HIGH OUTPUT DRIVE: 2.3A
  • WIDE SUPPLY RANGE: +9V to +60V
  • COMPLETE FUNCTION
  • PWM Output
  • Internal 24 kHz Oscillator
  • Digital Control Input
  • Adjustable Delay (Capacitor C1)
  • Adjustable Duty Cycle P1 Potentiometer
  • Over/Under Current Indicator
  • FULLY PROTECTED
  • Thermal Shutdown with Indicator
  • Internal Current Limit

APPLICATIONS

  • ELECTROMECHANICAL DRIVERS:
  • Solenoids Positioners
  • Actuators High Power Relays/Contactors
  • Valves Clutch/Brake
  • FLUID AND GAS FLOW SYSTEMS
  • INDUSTRIAL CONTROL
  • FACTORY AUTOMATION
  • PART HANDLERS
  • PHOTOGRAPHIC PROCESSING
  • ELECTRICAL HEATERS
  • MOTOR SPEED CONTROL
  • SOLENOID/COIL PROTECTORS
  • MEDICAL ANALYZERS

SCHEMATIC

PARTS LIST

PHOTOS

PCB

MIC PRE-AMPLIFIER

This project is a microphone pre-amplifier based on LM358.

DESCRIPTION

This is easy to construct microphone pre-amplifier project using compact electret condenser microphone. The pre-amplifier is important building block of many audio communication systems. Circuit has been built around Op-Amp LM358.

  • Power supply : 5 to 12 VDC @ 10 mA
  • Output: Gain Approx. 100
  • On-Board electret condenser microphone
  • Header connector for connecting of power supply input and audio output
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 35 mm x 40 mm

SCHEMATIC

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PCB

MINI AUDIO AMPLIFIER

This project is a mini Audio Amplifier based on LM386 IC.

DESCRIPTION

The Mini Audio Amplifier project is a good choice for battery operated gadgets.  It is based on Texas instruments LM386 IC, provides high quality Audio.

SPECIFICATIONS

  • Wide power supply input 6 to 12 VDC
  • 500 mW output @ 8 Ohms load
  • Takes standard audio signal as input
  • Low quiescent current drain 4 mA IC
  • The quiescent power drain is only 24 mW when operating from 6 VDC
  • Onboard preset for volume adjust
  • Header connector for connecting power supply, audio signal and speaker
  • Onboard power indication LED
  • On/Off PCB mounted slide switch for power supply
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 41 mm x 41 mm

SCHEMATIC

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PARTS LIST

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PCB

We are now selling a similar LM386 based audio amplifier module for beginners and hobbyists.

BC01

2 x LM386 Audio Amplifier Module

$10.15
This is a basic audio amplifier module for
BC-818

PAM8302- Mono 2.5W Class D Audio Amplifier

$6.70
This amplifier module is similar to LM386 module.

14W STEREO AUDIO AMPLIFIER

This project is a 14W Stereo Audio Amplifier based on LM4730 IC.

DESCRIPTION

14W Stereo audio power amplifier build around LM4730 IC. The LM4730 is stereo audio amplifier capable of delivering typical 14W per channel of continues average output power a 4 Ohms or 8 Ohms load with less than 10% THD+N from  20Hz to 20Khz frequency. Each amplifier has an independent smooth transition fade-in/out mute and a power conserving standby mode which can be controlled by onboard slide switches.

 The LM4730 has short circuit protection and thermal shutdown feature that is activated when the IC temperature exceeds 150 centigrade. The LM4730 also has under voltage lock out feature for click and pop free power off and on. Amplifier required proper heat sink.

APPLICATIONS

  • Audio Amplifier for High End Stereo TVs
  • Audio Amplifier for Component Stereo
  • Audio Amplifier for Compact Stereo
  • Audio Amplifier for PC
  • Audio Amplifier for Self Powered Speakers

SPECIFICATIONS

  • Outout Power into 4 Ohms or 8 Ohms , 14W
  • THD+N  10%
  • THD+N at 1Khz with 2X1W into 8Ohms 0.02%
  • Mute Attenuation 85dB
  • Standby Current 3.5mA (+/- 17V)
  • Dual power supply – ±18 VDC
  • Less then 10% THD+N from 20 Hz – 20 KHz
  • Onboard slide switch for mute and standby mode
  • Terminal pins for connecting left and right audio signal inputs
  • Header connector for connecting Potentiometer (POT) for volume adjustment
  • Power Battery Terminal (PBT) for easy dual power supply and speakers connection
  • Power-On LED indicator

SCHEMATIC

14W_Audio_Amplifier_Schematic

PARTS LIST

14W_STEREO_AMP_BOM

PCB

5.5W – 2 CHANNEL AUDIO AMPLIFIER

This project is a 5.5W – 2 Channel Audio Amplifier based on LA4445 IC.

DESCRIPTION

The small 2 Channel amplifier constructed around Sanyo’s LA4445 IC delivers 5.5Watts +5.5 Watts at 4 ohm load, supply in 12V DC 2Amp, Input impedance 30K.

SPECIFICATIONS

  • Dual Channels output : 5.5W
  • Minimum External Parts
  • Very small pop noise at the time of power supply ON/OFF
  • Good ripple rejections
  • Small residual noise
  • Built-in protectors 1. Thermal Protector 2. Overvoltage Surge Protector
  • Standard Audio signal
  • Supply 12V DC
  • Load: 4 Ohms Speaker on Each Channel
  • Voltage Gain : 50DB
  • Output 5.5W on each Channel (THD 10%)
  • Total harmonic distortion 1% Max @ Po=1W
  • Input impedance 30 K-ohms

SCHEMATIC

5.5W_2_Channel_Audio_Amplifier_Schematic

PARTS LIST

5.5W_2_Channel_Audio_Amplifier_BOM

 

PCB

MINI STEREO AUDIO AMPLIFIER

This project is a Mini Stereo Audio Amplifier based on TDA2822 IC.

DESCRIPTION

The dual low power amplifier built around TDA2822 8pin DIP. IC, it is mainly designed to use in portable players, radios and other building block project. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel, and a 12V power supply will provide 1W in 8 Ohm per channel for small loudspeakers.

SPECIFICATIONS

  • Supply 9V DC (supply Range 3V to 12V)
  • Load 8 Ohm Speaker
  • Gain 39dB
  • Input Impedance 100K Ohm
  • THD 10%
  • Frequency Response 20Hz to 20Khz

SCHEMATIC

Mini_Stereo_Audio_Amplifier_SCH

PARTS

Mini_Stereo_Audio_Amplifier_BOM

PCB

6.5W STEREO AUDIO AMPLIFIER

This project is a 6.5W Stereo Audio Amplifier based on TDA2004 IC.

DESCRIPTION

The 6.5W Stereo Audio Amplifier project built around TDA2004 IC. The TDA2004 is a class B dual audio power amplifier, specifically designed for car radio applications etc.

SPECIFICATIONS

  • Power supply input 15 VDC
  • Output power: 2 X 6.5 W, 4 Ohm / 2 X 10 W, 2 Ohm
  • Short circuit, thermal shut-down, load dump voltage surge protection
  • Terminal pins for connecting left and right audio signal inputs
  • Header connector for connecting potentiometer (POT) for volume adjustment
  • Screw terminal connector for easy supply input and speaker output connection
  • Power-On LED indicator
  • Heat-sink for IC
  • PCB dimensions 67 mm x 73 mm

SCHEMATIC

6.5W_Stereo_Audio_Amp_SCH

PARTS

6.5W_Stereo_Audio_Amp_BOM

PCB

10W STEREO AUDIO AMPLIFIER

This project is a 10W Stereo Audio Amplifier based on TDA1521 IC.

DESCRIPTION

The project built around Philips TDA1521 IC, The project provides high quality audio 2X10W Audio output. The device is specially designed for mains fed applications, (e.g. Stereo TV Sound and Stereo Radio). The circuit designed for asymmetrical power supply systems.

SPECIFICATIONS

  • It has few external components
  • Input muted during power on and off
  • Low offset voltage between output and ground
  • Excellent gain balance between channels
  • Short circuit proof IC
  • Thermally protected
  • Supply 18V DC @ 3.5A
  • Output Power 2X10W
  • Voltage Gain 30dB
  • Frequency response 20Hz-20Khz
  • Input impedance 20K Ohm
  • Output load 8 Ohm
  • Recommended power supply 18V @ 3Amps

SCHEMATIC

10W_Stereo_Amplifier_SCHEMATIC

PARTS

10W_Stereo_Amplifier_BOM

PCB

1.6W MONO AUDIO AMPLIFIER

1.6W Mono Audio Amplifier Project is based on TDA7231, which is class AB power amplifier with a wide range of supply.

FEATURES

  • Power supply: 5  To 12 VDC
  • Output: 1.6 W, 4 Ω / 1 W, 8 Ω
  • Low crossover distortion, soft clipping
  • PR1 Preset for Volume Adjust
  • Terminal pins for connecting power supply, input and output
  • Power On/OFF Switch
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 36 mm x 52 mm

SCHEMATIC

SCH

PARTS LIST

BOM

PCB

TINY MIC PREAMPLIFIER

The Tiny Mic Preamplifier based is based on a single transistor amplifier design.  It amplifies the output of the electret condenser microphone.  Good choice for Karaoke.

SPECIFICATIONS

  • Power supply: 5 ~ 9 VDC @ 2 mA
  • Provides standard audio signal
  • PCB dimensions 26 mm x 56 mm

SCHEMATIC

SCH

PARTS LIST

BOM

PCB

2 CHANNEL RELAY SHIELD FOR ARDUINO NANO

2 Channel Mini easy to use Relay shield for Arduino Nano consists of ULN2003 IC and 2 Mini 12V Relays with NO/NC contacts of 2A-24V Load Capacity. ULN2003 used as Relay coil driver. Relay can be controlled from D3 and D4 of Arduino Nano. Three-pin Header Connector CN1 and CN2 provided to connect the Load. Relay has normally open and normally closed contacts with 2A and 24V capacity and also can handle 120V AC but it’s not advisable. CN2 supply input 12V DC. LED D2 and D3 are the output LEDs.

FEATURES

  • Supply 12V DC
  • Relay Load 2A-24V DC (120V AC Possible with Care)
  • Relay Switch Normally Closed/Normally Open
  • On Board LED D2 and D3 Operation Indicator

SCHEMATIC

PARTS LIST

PHOTOS

PCB

4 DIGIT 7 SEGMENT DISPLAY SHIELD FOR ARDUINO NANO

4 Digit Multiplexed display shield for Arduino Nano with onboard 2 tactile switches and LM35 temperature sensor. This shield helps you to develop many projects that require 4 digit display. For example, a thermometer can be made using on board LM35 sensor.  7 Seven segment multiplexed display is a tiny board and has been designed around Common cathode 4 digit Display. Display has 12 Pins. The board is provided with current limiting resistors on all LED segments and 4 NPN Transistors to drive 4 digits. This tiny board directly seats on Arduino Nano.  Nano analog pin A0 connected to LM35 sensor, A1 and A2 connected to Switch 1 and switch 2 with pull down resistors. Digital pin D2-D8 connected to displays segment A-F, Digital pin D9 connected to DP of display, D10-D12 pins are associated to Digit 1-4 common cathode.

FEATURES

  • Supply 5V DC
  • 4 Digit 0.3 Inch Common Cathode 7 segment display
  • On board 2 Tact switch
  • On Board Female Connector to install LM35 Temperature sensor

SCHEMATIC

PARTS LIST

PHOTOS

PCB

10 LED BAR-GRAPH DISPLAY WITH OP-AMP SHIELD FOR ARDUINO NANO

Arduino Nano Bar-Graph display with universal op-amp shield consists of 10 LEDs and single low voltage general purpose LMV321 op amp including few capacitors and resistors connected to op-amp pins. The op-amp proto area can be configured without any modifications to the board and all that is necessary is to select the correct resistors and capacitors. The other optional components can be left open or shorted depending on the configuration desired. All 10 LED comes with current limiting series resistors connected to digital pins D2 to D11 of Arduino Nano, Nano analog pin A0 used as input, the input can be used directly as voltage input to measure the voltage and display on Bar-graph.

0 To 5V Bar-graph volt meter with 0.5V step is simplest project possible with the shield, many other sensor based application possible using op-amp as signal conditioning amplifier.

Code for Simple Bar-Graph Voltmeter with 0-5V range is available here.

https://www.arduino.cc/en/Tutorial/BarGraph

FEATURES

  • Supply 5V DC
  • 10 LED Connected to D2-D11 pins of Nano
  • Universal Op-Amp proto available
  • Trimmer Potentiometer provided to fine adjust the analog input Voltage
  • A0 Analog pin with series resistor is available for input

SCHEMATIC

PARTS LIST

CONNECTIONS

PHOTOS

VIDEO

PCB

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