Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with a 16x2 I2C LCD, a DHT 11 temperature and humidity sensor, a 12V single-channel relay, and a DC motor. The circuit is powered through a 2.1mm barrel jack with a terminal block. The Arduino UNO controls the relay, which in turn controls the DC motor. The DHT 11 sensor provides temperature and humidity data, which is displayed on the 16x2 I2C LCD.

Component List

1. Arduino UNO

   • Description: A microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. DC Motor

   • Description: A simple DC motor.
   • Pins: pin 1, pin 2

3. DHT 11

   • Description: A temperature and humidity sensor.
   • Pins: VCC, GND, DATA

4. 16x2 I2C LCD

   • Description: A 16x2 character LCD with I2C interface.
   • Pins: GND, VCC, SDA, SCL

5. 2.1mm Barrel Jack with Terminal Block

   • Description: A power connector for external power supply.
   • Pins: POS, NEG

6. 12V SINGLE CHANNEL RELAY

   • Description: A relay module for switching high power devices.
   • Pins: NC, COM, NO, IN, GND, VCC

Wiring Details

Arduino UNO

• GND connected to:

  • 16x2 I2C LCD (GND)
  • DHT 11 (GND)
  • 12V SINGLE CHANNEL RELAY (GND)

• 5V connected to:

  • 16x2 I2C LCD (VCC)
  • DHT 11 (VCC)
  • 12V SINGLE CHANNEL RELAY (VCC)

• A4 connected to:

  • 16x2 I2C LCD (SDA)

• A5 connected to:

  • 16x2 I2C LCD (SCL)

• D3 connected to:

  • 12V SINGLE CHANNEL RELAY (IN)

• D2 connected to:

  • DHT 11 (DATA)

DC Motor

• pin 1 connected to:

  • 12V SINGLE CHANNEL RELAY (NO)

• pin 2 connected to:

  • 2.1mm Barrel Jack with Terminal Block (NEG)

2.1mm Barrel Jack with Terminal Block

• POS connected to:
  • 12V SINGLE CHANNEL RELAY (COM)

12V SINGLE CHANNEL RELAY

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• IN connected to:

  • Arduino UNO (D3)

• NO connected to:

  • DC Motor (pin 1)

• COM connected to:

  • 2.1mm Barrel Jack with Terminal Block (POS)

16x2 I2C LCD

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• SDA connected to:

  • Arduino UNO (A4)

• SCL connected to:

  • Arduino UNO (A5)

DHT 11

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• DATA connected to:

  • Arduino UNO (D2)

Documented Code

Arduino UNO Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Documentation (documentation.txt)