30sec Timer

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Find out how many days until Spring 2026. Live countdown timer and planning tips for Spring.

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too many arguments to function 'hw_timer_t* timerBegin (uint32_t)' 528 | timer = timerBegin (0, 80, true); // Alarm value will be in in us it looks like you are attempting to build code using ESP32 core 3.x which was implemented for ESP32 core 2.x have a look at the ESP32 core V3.x Arduino-ESP32 Timer API also worth looking at is Migration from ESP32 core 2.x to 3.x

I'm posting here a simple project to create an interrupt timer on an ESP32 board for version 3.1.1 by Esspressif Systems. I had difficulties to find updated information to make this code, I hope it can be useful to someone ! This code creates an interrupt every 100ms and counts the number of interrupts. There is the code : #include "esp32-hal-timer.h" const int ledPin = 2; // pin of the LED ...

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I clear the timer, set it up in Input Capture Mode, set the pre-scaler to ClkIO/1024, and enable Overflow interrupts, as the event I'm timing can take up to 10 seconds, which means the timer may overflow twice. I maintain a software count, in a uint32_t that is increment by 65536 every time an overflow occurs.

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I am creating a timer for a race. I have a photosensor that has a laser pointed to so when someone crosses the finish, it trips the sensor, and the system logs the racer's time. I am using millis() to time the race, but I need the timer to start when I push the button. I have tried using edge detection to start the timer, but the timer starts when the program starts, not when the program ...

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