Circuit Documentation

Summary

This circuit is designed to monitor temperature and humidity using a DHT11 sensor, display the data on an OLED screen, and control an exhaust fan and air heater using a relay module. The system is powered by an Arduino UNO microcontroller, which interfaces with the various components to perform the required tasks.

Component List

1. KY-004 Key Switch Module

   • Description: A simple key switch module used for user input.
   • Pins: S, Middle, -

2. RTC (Real-Time Clock)

   • Description: A module to keep track of the current time.
   • Pins: VCC, GND, CLK, DAT, RST

3. KY-015 DHT11 Temperature-Humidity Sensor Module

   • Description: A sensor module to measure temperature and humidity.
   • Pins: VCC, GND, DOUT

4. 0.96" OLED

   • Description: A small OLED display to show data.
   • Pins: GND, VDD, SCK, SDA

5. Exhaust Fan

   • Description: A fan to control air circulation.
   • Pins: L, GND

6. Power 220V

   • Description: Power source for high voltage components.
   • Pins: Hot wire, Neutral wire

7. Air Heater

   • Description: A heater to control the temperature.
   • Pins: L, GND

8. 5V Adapter

   • Description: Adapter to convert AC to 5V DC.
   • Pins: AC In 1, AC In 2, 5V, GND

9. Arduino UNO

   • Description: Microcontroller to control the circuit.
   • 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

10. Relay 4 Channel 5V

    • Description: Relay module to control high voltage components.
    • Pins: GND, IN1, IN2, IN3, IN4, VCC, COM1, COM2, COM3, COM4, NO1, NO2, NO3, NO4, NC1, NC2, NC3, NC4

11. USB Power

    • Description: Power source for USB-powered components.
    • Pins: +, -

Wiring Details

KY-004 Key Switch Module

• Pin S connected to Arduino UNO D3
• Pin - connected to GND (Common Ground)

RTC (Real-Time Clock)

• Pin VCC connected to Arduino UNO 5V
• Pin GND connected to GND (Common Ground)
• Pin CLK connected to Arduino UNO A5
• Pin DAT connected to Arduino UNO A4

KY-015 DHT11 Temperature-Humidity Sensor Module

• Pin VCC connected to Arduino UNO 5V
• Pin GND connected to GND (Common Ground)
• Pin DOUT connected to Arduino UNO D2

0.96" OLED

• Pin GND connected to GND (Common Ground)
• Pin VDD connected to Arduino UNO 5V
• Pin SCK connected to Arduino UNO A5
• Pin SDA connected to Arduino UNO A4

Exhaust Fan

• Pin L connected to Relay 4 Channel 5V NO4
• Pin GND connected to Power 220V Neutral wire

Power 220V

• Hot wire connected to Relay 4 Channel 5V COM3 and COM4
• Neutral wire connected to Exhaust Fan GND and Air Heater GND

Air Heater

• Pin L connected to Relay 4 Channel 5V NO3
• Pin GND connected to Power 220V Neutral wire

5V Adapter

• AC In 1 connected to Power 220V Hot wire
• AC In 2 connected to Power 220V Neutral wire
• 5V connected to Arduino UNO 5V
• GND connected to GND (Common Ground)

Arduino UNO

• 5V connected to VCC of RTC, KY-015 DHT11, and 0.96" OLED
• GND connected to GND (Common Ground)
• A5 connected to CLK of RTC and SCK of 0.96" OLED
• A4 connected to DAT of RTC and SDA of 0.96" OLED
• D3 connected to Pin S of KY-004 Key Switch Module
• D2 connected to DOUT of KY-015 DHT11
• D9 connected to IN2 of Relay 4 Channel 5V
• D8 connected to IN4 of Relay 4 Channel 5V
• D7 connected to IN3 of Relay 4 Channel 5V

Relay 4 Channel 5V

• IN2 connected to Arduino UNO D9
• IN4 connected to Arduino UNO D8
• IN3 connected to Arduino UNO D7
• NO4 connected to L of Exhaust Fan
• NO3 connected to L of Air Heater
• COM3 connected to Power 220V Hot wire
• COM4 connected to Power 220V Hot wire

USB Power

• Pin + connected to Pin - of another USB Power
• Pin - connected to Pin + of another USB Power

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:

}

Documentation (documentation.txt)

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the microcontroller.