Essentially I am wanting to combine the StateChangeDectection (Digital) and Calibration (Analog) examples. I am wanting a press and release of a button to switch the LED off or have the brightness controlled by the potentiometer. However, pressing the button doesnt seem to change the state of the LED in a controlled manner, i.e. after pressing the button 4 times turn off or after 1 press turn on.
I'm not sure if its my code (probably is) or the setup of my breadboard. I have attached my setup and the code below.
Any ideas?
// These constants won't change:
const int sensorPin = A0; // pin that the sensor is attached to
const int ledPin = 9; // pin that the LED is attached to
const int buttonPin = 4; // pin button attached to
// variables:
int sensorValue = 0; // the sensor value
int sensorMin = 1023; // minimum sensor value
int sensorMax = 0; // maximum sensor value
int buttonState = 0; // initial state of button
int lastState = 0; //initial last state of button
int counter = 0; // start counter at 0
void setup() {
// turn on built in LED to signal the start of the calibration period:
pinMode(13, OUTPUT);
pinMode(buttonPin,INPUT);
digitalWrite(13, HIGH);
analogWrite(ledPin,0);
// calibrate during the first ten seconds
while (millis() < 10000) {
sensorValue = analogRead(sensorPin);
// record the maximum sensor value
if (sensorValue > sensorMax) {
sensorMax = sensorValue;
}
// record the minimum sensor value
if (sensorValue < sensorMin) {
sensorMin = sensorValue;
}
}
// signal the end of the calibration period
digitalWrite(13, LOW);
}
void loop() {
// read the sensor and button:
sensorValue = analogRead(sensorPin);
buttonState = digitalRead(buttonPin);
// apply the calibration to the sensor reading
sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
// in case the sensor value is outside the range seen during calibration
sensorValue = constrain(sensorValue, 0, 255);
if (buttonState != lastState)
{
if (buttonState == HIGH) {
counter++;
}
delay(50);
}
lastState = buttonState;
if (counter % 2 == 1) {
analogWrite(ledPin,sensorValue);
} else {
analogWrite(ledPin,0);
}
