Arduino motion sensor code not working :(

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1

For an school assignment, we need to code a motion sensor. When it detects movement it will turn on a buzzer, when it doesn't it doesn't play a noise
PLEASE HELP AND THANK YOU !!!!!!

const int PIN_TO_SENSOR = 3;
int pinStateCurrent = LOW;
int pinStatePrevious = LOW;

const int buzzerPin = 9;

int rate = 500
int frequency = 1000000/ (rate * 2);

void setup() {
  Serial.begin(9600);
  pinMode(PIN_TO_SENSOR, INPUT);
pinMode(buzzerPin, OUTPUT);
Serial.print (frequency);
}

void loop() {
 pinStatePrevious = pinStateCurrent;
 pinStateCurrent = digitalRead(PIN_TO_SENSOR);

if (pinStatePrevious= LOW && pinStateCurrent == HIGH) {
Serial.println("Motion detected");
digitalWrite (buzzerPin,HIGH);


}




}
2

Maybe this helps

3

At no time do you use this line... follow @Kai-R and learn how the program works. Have fun with all your projects.

4

forgot the ;

5

change this to Serial.println(frequency); so you get a new, clean line once you enter void loop()

6

Oops, watch that usage of = vs ==

7

This is why it is also helpful to write if (LOW== pinStatePrevious) instead of if (pinStatePrevious== LOW). Then the compiler will complain if you use "=" instead of "==". The error will then not go unnoticed.

8

Thank you all so much for your feedback. We have edited the program via your help and it works great now! Thanks everyone, hope you all have a great day!

1 Like
9

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