30 lines
938 B
C++
30 lines
938 B
C++
// Button Input pullup demo
|
|
// Connect to D19
|
|
// Note: no debounce logic
|
|
|
|
const int BUTTON_PIN = 19; // GIOP19 pin connected to button
|
|
|
|
// Variables will change:
|
|
int lastState = LOW; // the previous state from the input pin
|
|
int currentState; // the current reading from the input pin
|
|
|
|
void setup() {
|
|
// initialize serial communication at 9600 bits per second:
|
|
Serial.begin(115200);
|
|
// initialize the pushbutton pin input
|
|
// the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed.
|
|
pinMode(BUTTON_PIN, INPUT_PULLUP);
|
|
}
|
|
|
|
void loop() {
|
|
// read the state of the switch/button:
|
|
currentState = digitalRead(BUTTON_PIN);
|
|
|
|
if(lastState == HIGH && currentState == LOW)
|
|
Serial.println("The button is pressed");
|
|
else if(lastState == LOW && currentState == HIGH)
|
|
Serial.println("The button is released");
|
|
|
|
// save the the last state
|
|
lastState = currentState;
|
|
}
|