Here is the button press code that works and as far as far as I can see is the same as I'm using in my main program. Only the conditions of what happens when the button is pressed is differnt.
// Push button variables
const byte buttonPin = 4; // Arduino pin the push button is connected to.
byte previousButtonState = HIGH; // Assume switch open because of pull-up resistor.
byte currentButtonState; // Will be populated by reading button pin satae.
const unsigned long debounceTime = 10; // Milliseconds of debounce.
unsigned long buttonPressTime; // Time since button last changed state. Used to differentialte button bounce vs. intentional press.
boolean buttonPressed = 0; // A flag variable to identify button presses. Returned from button debounce code.
void setup() {
pinMode (buttonPin, INPUT_PULLUP); // Set button pin as input.
Serial.begin(9600); // Begin Serial monitor.
}
void loop() {
// Button press code with debounce.
currentButtonState = digitalRead (buttonPin);
if (currentButtonState != previousButtonState){
if (millis () - buttonPressTime >= debounceTime){ // debounce
buttonPressTime = millis (); // when we closed the switch
previousButtonState = currentButtonState; // remember for next time
if (currentButtonState == LOW){ // When debounce criteria are met and button is still pressed.
buttonPressed = 1; // Set button flag to 1.
Serial.println("Button Pressed");
}
else { // When debounce criteria are not met because boutton is not pressed or it is bouncing.
buttonPressed = 0; // Set button flag to 0.
}
}
}
}