Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
const int sensorPin = A0;
void setup() {
Serial.begin(9600);
}
void loop() {
int moisture = analogRead(sensorPin);
Serial.println(moisture);
delay(1000);
}How it works
This lesson matches the page title and gives a clean starting point for this exact example.
Common mistakes
Check board selection, wiring, libraries, power supply and serial monitor baud rate.