The ideal library for heartbeats, timeouts and repeated timers. Easier to use than your kitchen timer.
This is a library I use in almost all of my projects. It is fully unit-tested and works on all platforms (AVR, SAM, ESP...) that support the arduino core.
The LED will turn off after 2 seconds.
#include <Timeout.h>
const int LED_PIN = 13;
Timeout timer;
void setup()
{
pinMode(LED_PIN, OUTPUT);
timer.start(2000);
}
void loop()
{
digitalWrite(LED_PIN, !timer.time_over());
}Connect a button to pin 12. Press the button to turn on the LED. Failing to press the button for more than one second switches off the LED.
#include <Timeout.h>
const int LED_PIN = 13;
const int BUTTON_PIN = 12;
Timeout heartbeat;
void setup()
{
pinMode(LED_PIN, OUTPUT);
pinMode(BUTTON_PIN, INPUT);
}
void loop()
{
if (digitalRead(BUTTON_PIN)) {
heartbeat.start(1000);
}
digitalWrite(LED_PIN, !heartbeat.time_over());
}Toggles the LED every 200 milliseconds.
#include <Timeout.h>
const int LED_PIN = 13;
bool led_on = false;
Timeout timer;
void setup()
{
pinMode(LED_PIN, OUTPUT);
}
void loop()
{
if (timer.periodic(200)) {
led_on = !led_on;
digitalWrite(LED_PIN, led_on);
}
}Timeout instances have the following methods:
// set the timer to `time_ms` and start ticking
void start(uint32_t time_ms);
// returns a single true when time runs out and then resets to `time_ms`.
bool periodic(uint32_t time_ms);
// pause and resume the timer
void pause();
void resume();
// runs out the timer so `time_over()` returns true
void expire();
// returns whether the time ran out
bool time_over();
// returns whether the timer is paused
bool is_paused();
// returns the milliseconds until the timer runs out
uint32_t time_left_ms();