Keyestudio ESP32 Manual page 126

ESP32 Starter Kit
3. Wiring Diagram
4. Test Code
Connect the sensor to pin IO33. Read the sound analog value through analogRead(Pin) function and print it on serial
monitor.
/*
keyestudio ESP32 Inventor Learning Kit
Project 21.1Sound Controlled LED
http://www.keyestudio.com
*/
int
sound = 33; //Define sound as IO33
void
setup(){
Serial.begin(9600);
pinMode(sound,INPUT);
}
void loop(){
int value = analogRead(sound);
Serial.println(value);
}
122 Chapter 8. Arduino Tutorial