I am trying to make an LED blink when someone goes past an ultrasonic range finder. My code constantly blinks seemingly whether the if statement is true or not. Below is my void loop. Why would this be? void loop() { // establish variables for duration of the ping, and the distance result // in…

LED Blink When Someone Walks Past

LarryD April 6, 2018, 10:18pm 2

if (oldcm-cm > 50);

That ; is a place you can start looking at.