/* * This example shows how to combine the EnableInterrupt * library with some simple debouncing code for reading * button presses consistently. * * The interrupt is attached to digital input 5 and the * service routine just toggles the onboard LED status. * * Tested on: ATmega328P * * Example by Lorenzo Cafaro * */ #include #define BUTTON_PIN 5 #define DEBOUNCE_DELAY 100 // in ms uint32_t last_interrupt_time = 0; uint8_t led_status = 0; void setup() { pinMode(BUTTON_PIN, INPUT); pinMode(LED_BUILTIN, OUTPUT); enableInterrupt(BUTTON_PIN, isr_handler, RISING); } void loop() { // zZz } void isr_handler() { uint32_t interrupt_time = millis(); if (interrupt_time - last_interrupt_time > DEBOUNCE_DELAY) { led_status = !led_status; digitalWrite(LED_BUILTIN, led_status); } last_interrupt_time = interrupt_time; }