Arduino tiny and cross-device compatible timer library.Timers used by each microcontroller:

• Atmel ATtiny: Timer1 (2nd timer) - https://github.com/damellis/attiny and https://github.com/SpenceKonde/Disgispark AVRCore (25, 45 and 85)
• DisgiSpark AVR: Timer0 (1st timer) - https://github.com/digistump/DigistumpArduino
• Atmel AVR 32U4: Timer3 (4rd timer)
• Atmel AVR other: Timer2 (3rd timer)
• STM32: Timer3 (3rd timer)
• SAM (Due): TC3 (Timer1, channel 0)
• ESP8266: OS Timer, one slot of seven available (Software timer provided by Arduino because ESP8266 has only two hardware timers and one is needed by it normal operation)
• ESP32: OS Hardware Timer.
• SAMD21: Timer 4, CC0 (TC3). See http://ww1.microchip.com/downloads/en/DeviceDoc/40001882A.pdf
• SAMD51: Timer 2 (TC1), 16 bits mode (See http://ww1.microchip.com/downloads/en/DeviceDoc/60001507C.pdf

You have public TimerLib variable with following methods:

• TimerLib.setInterval_us(callback_function, microseconds);* : callback_function will be called each microseconds.
• TimerLib.setInterval_s(callback_function, seconds);* : callback_function will be called each seconds.
• TimerLib.setTimeout_us(callback_function, microseconds);* : callback_function will be called once when microseconds have passed.
• TimerLib.setTimeout_s(callback_function, seconds);* : callback_function will be called once when seconds have passed.
• TimerLib.clearTimer();* : will clear any timed function if exists.