Circuit Documentation

Summary

This circuit is designed to detect the presence of a flame using a KY-026 Flame Sensor and control a 220V fan through a 1-Channel Relay. The Arduino UNO microcontroller is used to process the sensor input and control the relay, which in turn controls the fan.

Component List

1. 1-Channel Relay (5V 10A)

   • Description: A relay module that allows a low voltage (5V) control signal to switch a high voltage (up to 10A) load.
   • Pins: NC, signal, C, power, NO, ground

2. KY-026 Flame Sensor

   • Description: A sensor module that detects the presence of a flame.
   • Pins: A0, GND, VCC, D0

3. 220V Fan

   • Description: A fan that operates on 220V AC.
   • Pins: N, L

4. Power 220V

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

5. 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

Wiring Details

1-Channel Relay (5V 10A)

• power connected to Arduino UNO 3.3V
• ground connected to Arduino UNO GND
• signal connected to Arduino UNO D4
• C connected to Power 220V hot wire
• NO connected to 220V Fan L

KY-026 Flame Sensor

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• D0 connected to Arduino UNO D2

220V Fan

• L connected to 1-Channel Relay NO
• N connected to Power 220V neutral wire

Power 220V

• hot wire connected to 1-Channel Relay C
• neutral wire connected to 220V Fan N

Code Documentation

Arduino UNO Code

#define FLAME 2 
#define FAN 4 

void setup() { 
    pinMode(FLAME, INPUT); 
    pinMode(FAN, OUTPUT); 
}

void loop() { 
    delay(200); 
    int flame = digitalRead(FLAME); 
    if(flame == 1) { 
        digitalWrite(FAN, HIGH); 
    } else { 
        digitalWrite(FAN, LOW); 
    } 
}

Explanation:

• FLAME is defined as pin 2, which is connected to the D0 pin of the KY-026 Flame Sensor.
• FAN is defined as pin 4, which is connected to the signal pin of the 1-Channel Relay.
• In the setup() function, pinMode is used to set FLAME as an input and FAN as an output.
• In the loop() function, the code reads the state of the flame sensor every 200 milliseconds. If a flame is detected (flame == 1), the relay is activated (digitalWrite(FAN, HIGH)), turning on the fan. If no flame is detected, the relay is deactivated (digitalWrite(FAN, LOW)), turning off the fan.