Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with various components including a DS18B20 temperature sensor, a 16x2 I2C LCD, multiple pushbuttons, 5V relays, a heater element, a fan, and a 220V power source. The circuit is designed to control the heater and fan based on temperature readings and user inputs.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. DS18B20

   • Description: A digital temperature sensor.
   • Pins: VDD, DQ, GND

3. 16x2 I2C LCD

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

4. 5V Relay

   • Description: A relay module that operates at 5V.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

5. Pushbutton

   • Description: A simple pushbutton switch.
   • Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)

6. Connector 5V

   • Description: A connector for 5V power supply.
   • Pins: GND, VCC

7. Power 220V

   • Description: A 220V power source.
   • Pins: hot wire, neutral wire

8. Heater Element

   • Description: A heating element.
   • Pins: VCC, GND

9. Fan

   • Description: A 5V fan.
   • Pins: GND, 5V

Wiring Details

Arduino Nano

• D3 connected to DQ of DS18B20
• D5 connected to In of 5V Relay
• D6 connected to In of 5V Relay
• VIN connected to:
  • Common terminal of 5V Relay
  • VCC of 5V Relay
  • VCC of 16x2 I2C LCD
  • VCC of 5V Relay
  • VCC of Connector 5V
  • VDD of DS18B20
• GND connected to:
  • GND of Fan
  • GND of 5V Relay
  • Pin 2 (in) of Pushbutton
  • Pin 2 (in) of Pushbutton
  • GND of 16x2 I2C LCD
  • Pin 2 (in) of Pushbutton
  • GND of 5V Relay
  • GND of Connector 5V
  • GND of DS18B20
• A5 connected to SCL of 16x2 I2C LCD
• A4 connected to SDA of 16x2 I2C LCD
• A2 connected to Pin 4 (out) of Pushbutton
• A1 connected to Pin 4 (out) of Pushbutton
• A0 connected to Pin 4 (out) of Pushbutton

DS18B20

• DQ connected to D3 of Arduino Nano
• VDD connected to VIN of Arduino Nano
• GND connected to GND of Arduino Nano

16x2 I2C LCD

• GND connected to GND of Arduino Nano
• VCC connected to VIN of Arduino Nano
• SDA connected to A4 of Arduino Nano
• SCL connected to A5 of Arduino Nano

5V Relay

• In connected to D5 of Arduino Nano
• In connected to D6 of Arduino Nano
• Common terminal connected to VIN of Arduino Nano
• VCC connected to VIN of Arduino Nano
• GND connected to GND of Arduino Nano
• Normally Open connected to VCC of Heater Element

Pushbutton

• Pin 2 (in) connected to GND of Arduino Nano
• Pin 4 (out) connected to A2 of Arduino Nano

Pushbutton

• Pin 2 (in) connected to GND of Arduino Nano
• Pin 4 (out) connected to A1 of Arduino Nano

Pushbutton

• Pin 2 (in) connected to GND of Arduino Nano
• Pin 4 (out) connected to A0 of Arduino Nano

Connector 5V

• GND connected to GND of Arduino Nano
• VCC connected to VIN of Arduino Nano

Power 220V

• hot wire connected to Common terminal of 5V Relay
• neutral wire connected to GND of Heater Element

Heater Element

• VCC connected to Normally Open of 5V Relay
• GND connected to neutral wire of Power 220V

Fan

• GND connected to GND of Arduino Nano
• 5V connected to Normally Open of 5V Relay

Documented Code

Arduino Nano 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)