These Hardware Timers, using Interrupt, still work even if other functions are blocking. Arduino Uno has 3 x Timers available: Timer0 - An 8 bit timer. ![]() ![]() For example, a simple timer interrupt or a watchdog timer interrupt (when the timer. Timer0 - An 8 bit timer used by Arduino functions delay(), millis() and micros(). This library enables you to use Interrupt from Hardware Timers on supported Arduino boards such as AVR, Mega-AVR, ESP8266, ESP32, SAMD, SAM DUE, nRF52, STM32F/L/H/G/WB/MP1, Teensy, Nano-33-BLE, RP2040-based boards, etc. ESP8266 gas 2 x Timers available: 0 (Used by WiFi), 1 is available to configure. Software Interrupts These occur in response to a software instruction. NOTE - Timer interrupts may interfere with other functionality (PWM for example) depending on the timer chosen to configure.Ġ (Used by WiFi), 1 is available to configure.Į.g. It now supports 16 ISR-based timers, while consuming only 1 Hardware Timer. Only fire when the configured timer overflowsĪre restricted to a small number of timers depending on the MCU hardware in use.Ĭan only set values to variables declared with VOLATILE, which ensures they arent optimized away, and can be used reliably in the ISR and in the main loop() code This library enables you to use Interrupt from Hardware Timers on an Arduino, Adafruit or Sparkfun AVR board, such as Nano, UNO, Mega, Leonardo, YUN, Teensy, Feather32u4, Feather328P, Pro Micro, etc. Author: Stoyko Dimitrov, Jesse Tane, Jrme Despatis, Michael Polli, Dan Clemens, Paul Stoffregen. Need to be extremely fast to execute, and it is often best to simply set a number of flags or states within the Interrupt Service Routine, then evaluate them when required in your normal thread code in loop(). Use hardware Timer1 for finer PWM control and/or running an periodic interrupt function.
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