HOW to Create a Mini Fire-fighter with ESP32

Description

Today we will use Arduino simulation to build an extinguishing robot that will automatically sense the fire and start the fan. In this project we will learn how to build a very simple robot using ESP32, (detecting flames with a flame sensor, blowing out candles with a fan) can teach us basic concepts about robotics. Once you understand the basics below, you can build more complex robots.

Components Required

Connection Diagram

Test Code

//**********************************************************************************
/*  
 * Description : Flame sensor controls the 130 fan module
 * Auther      : http//www.keyestudio.com
*/
int item = 0;
void setup() {
  Serial.begin(9600);
  pinMode(15, OUTPUT);//INA corresponds to IN+, and sets GPIO15 to output mode
  pinMode(4, OUTPUT);//INB corresponds to IN-, and sets GPIO4 to output mode
}

void loop() {
  item = analogRead(34);//The flame sensor is connected to GPIO34, and read the simulated value to Item  
  Serial.println(item);//Serial port display analog value
  if (item < 3000) {//Less than 3000
    digitalWrite(15, LOW);//Turn on the fan
    digitalWrite(4, HIGH);
  } else {//Otherwise, turn off the fan.
    digitalWrite(15, LOW);
    digitalWrite(4, LOW);
  }
  delay(100);
}
//**********************************************************************************

Code Explanation

In the code, we set the threshold value to 3000. When the ADC value detected by the flame sensor is lower than the threshold value, the fan will be automatically turned on; otherwise, it will be turned off. For the driving method of the fan, please refer to the 130 Motor.

Test Result

Connect the wires according to the experimental wiring diagram, switch the DIP switch on the ESP32 expansion board to the ON end and power up, compile and upload the code to the ESP32. After uploading successfully, open the serial monitor and set baud rate to 9600, then the ADC value of the flame will be printed. When this value is less than 3000, the fan will work to blow out the fire, otherwise, it will be turned off. Basically, the ADC value can be set by yourself.