The code is working perfectly,
Starting like this makes people think it's an open question just to give hints on how to do it.
Few people will scroll down to read this part:
but won't run below approx 1300rpm (22Hz), or above approx 10500rpm (175Hz). At the low end it just stops working. At th… Answer from rtek1000 on forum.arduino.cc
CircuitDigest
circuitdigest.com › microcontroller-projects › esp32-timers-and-timer-interrupts
ESP32 Timers & Timer Interrupt Tutorial
August 5, 2025 - More sophisticated ESP32 timer interrupt programming projects may implement multiple timer interrupts to, for example, construct a complicated timing sequence, multiplex sensor data, or handle timed communication protocols.
ElectronicWings
electronicwings.com › esp32 › esp32-timer-interrupts
ESP32 Timer Interrupts | ESP32
So, for accuracy in time interval, mission critical tasks, etc H/W timers are very much important. The ESP32 has two timer groups.
ESP32 Multiple changing timer interrupts - Motorcycle CDI
Hi Guys, I have been using the code below to run my DIY CDI system. The code is working perfectly, What I'm doing is getting an external interrupt from the variable reluctance sensor (though a conditioning circuit). This external interrupt then start the process of waiting....charging a capacitor, ... More on forum.arduino.cc
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1
July 15, 2022ESP 32 Timer Interrupts – ‘Unlimited’ Programmatic User Definable Timers
Hi, If you have an interest in interrupt timers and want a flexible approach to their use in your projects then you might find this post of interest... More on forum.dronebotworkshop.com
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July 20, 2022Programming timer interruption
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 ... More on forum.arduino.cc
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February 6, 2025Working interrupt timer example?
My guess is PlatformIO's ESP-IDF package isn't as new as the one in Arduino IDE, which always has the latest espressif bits, unlike PIO. Without seeing your code I can't really say much. More on reddit.com
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March 26, 2024Videos
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Learning Timer Interrupts for ESP32 and Arduino - YouTube
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008 - ESP32 MicroPython: Hardware Timer Interrupt - YouTube
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ESP32 #56: ESP32 Timer & Multiple Timer & Changing Timer - YouTube
Espressif
docs.espressif.com › projects › esp-idf › en › v4.3 › esp32 › api-reference › peripherals › timer.html
General Purpose Timer - ESP32 - — ESP-IDF Programming Guide v4.3 documentation
Timer Control - describes how to read a timer’s value, pause or start a timer, and change how it operates. Alarms - shows how to set and use alarms. Interrupts- explains how to use interrupt callbacks. The two ESP32 timer groups, with two timers in each, provide the total of four individual timers for use.
TechTutorialsX
techtutorialsx.com › 2017 › 10 › 07 › esp32-arduino-timer-interrupts
ESP32 Arduino: Timer interrupts
In this post we are going to learn how to receive messages sent from the WebSerial UI, on the ESP32.
Top answer 1 of 2
1
The code is working perfectly,
Starting like this makes people think it's an open question just to give hints on how to do it.
Few people will scroll down to read this part:
but won't run below approx 1300rpm (22Hz), or above approx 10500rpm (175Hz). At the low end it just stops working. At th…
2 of 2
1
@rtek1000
Thanks for your comments.
I think that I've figured it out...eventually.
I see now what I was doing.
Basically, using one timer will not work unless the variable for ignAdv is great than the variable for baseAdv. If it is less then the external interrupt fires before the timer sequence…
ESP32 Forum
esp32.com › viewtopic.php
Having an issue with multiple timer interrupts. - ESP32 Forum
May 19, 2021 - After I added a second timer and interrupt for LDR readings my temperature interrupt stopped working.
Random Nerd Tutorials
randomnerdtutorials.com › home › project › esp32 › esp32 with freertos: software timers/timer interrupts (arduino ide)
ESP32 FreeRTOS: Software Timers/Timer Interrupts (Arduino) | Random Nerd Tutorials
November 20, 2025 - Use software timers (timer interrupts) with the ESP32 using FreeRTOS programming on Arduino IDE. Discover auto-reload (periodic) timers and one-shot timers with simple examples.
GitHub
github.com › khoih-prog › ESP32TimerInterrupt
GitHub - khoih-prog/ESP32TimerInterrupt: This library enables you to use Interrupt from Hardware Timers on an ESP32-based board. It now supports 16 ISR-based timers, while consuming only 1 hardware Timer. Timers' interval is very long (ulong millisecs). The most important feature is they're ISR-based timers. Therefore, their executions are not blocked by bad-behaving functions or tasks. This important feature is absolutely necessary for mission-critical tasks. · GitHub
January 29, 2023 - This library enables you to use Interrupt from Hardware Timers on an ESP32-based board. It now supports 16 ISR-based timers, while consuming only 1 hardware Timer. Timers' interval is very long (ulong millisecs).
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DeepBlue
deepbluembedded.com › home › blog › esp32 timers & timer interrupt tutorial (arduino ide)
ESP32 Timers & Timer Interrupt Tutorial (Arduino IDE) – DeepBlueMbedded
February 17, 2025 - We’ll be doing 2 different LABs in this tutorial. In the first LAB, we’ll be configuring one of the ESP32’s Timers to generate a periodic interrupt in which we’ll toggle an LED. In the 2nd LAB, we’ll measure the elapsed time between two external events using one of the ESP32’s Timers.
ArduinoYard
arduinoyard.com › home › esp32 guides › esp32 interrupt timers – a basic guide for beginner’s
ESP32 Interrupt Timers – A Basic Guide For Beginner’s - ArduinoYard
September 10, 2025 - Whether you are blinking an LED ... timers. The ESP32 makes this possible through interrupt timers, which are hardware-based modules designed to trigger specific functions at defined intervals. The ESP32 has multiple hardware timers that can generate interrupt...
Iotespresso
iotespresso.com › timer-interrupts-with-esp32
Timer Interrupts with ESP32 – iotespresso.com
Instead of 0 to 10, they count from 0 to (2^N -1), N being the number of bits of the counter. Thus, an 8-bit counter will count from 0 to 255, a 16-bit counter will count from 0 to 65535, and so on. ESP32 has two timer groups, each group containing two 64-bit timers.
ESP32 Forum
esp32.com › viewtopic.php
[SOLVED] ESP32 - Using more than one timer - ESP32 Forum
March 10, 2021 - pinMode(pinSend, OUTPUT); timer = timerBegin(0,80,true); //1MHz, prescaler de 80 timerAttachInterrupt(timer, &onTime, true); timerAlarmWrite(timer, 10, true); //interrumps every 10 micros timerAlarmEnable(timer); timer2 = timerBegin(1,80,true); //1MHz, prescaler de 80 timerAttachInterrupt(timer2, &onTime2, true); timerAlarmWrite(timer2, 501, true); //interrumpe every 501 micros timerAlarmEnable(timer2); Loop: ... if (interruptCounter2 > 0) { //this one works ok!!
DroneBot Workshop
forum.dronebotworkshop.com › forums › inside the workshop › project corner › show & tell
ESP 32 Timer Interrupts – ‘Unlimited’ Programmatic User Defi...
July 20, 2022 - What I ended up with was a solution that met all of the above objectives and one that can be used as a framework sketch, as a starting point, were a solution requiring a number of user definable timers are to be handled – the ESP 32 ETA Framework. The ETA framework was developed using an ESP 32S 30 pin WROOM microcontroller and the Arduino IDE. The IDE board selection was "DOIT ESP32 DEVKIT V1".
Espressif
docs.espressif.com › projects › esp-idf › en › release-v4.2 › esp32 › api-reference › peripherals › timer.html
Timer - ESP32 - — ESP-IDF Programming Guide release-v4.2 documentation
Timer Control - describes how to read a timer’s value, pause or start a timer, and change how it operates. Alarms - shows how to set and use alarms. Interrupts- explains how to enable and use interrupts. The two ESP32 timer groups, with two timers in each, provide the total of four individual timers for use.
Arduino Forum
forum.arduino.cc › projects › programming
Programming timer interruption - Programming - Arduino Forum
February 6, 2025 - 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.
Arduino
arduino.cc › reference › en › libraries › esp32timerinterrupt
Arduino
July 19, 2022 - The Arduino environment can be extended through the use of libraries. Libraries provide extra functionality for use in sketches. To use a library in a sketch, select it from Sketch > Import Library.
Wolles Elektronikkiste
wolles-elektronikkiste.de › startseite › interrupts – part 3: timer interrupts
Interrupts - Part 3: Timer Interrupts • Wolles Elektronikkiste
January 28, 2025 - The ESP32 has four 64-bit timers (exception: the ESP32-C3 has two) and for each of them you can set up an interrupt. The timer counts according to the system frequency (i.e.
ESP32 Forum
esp32.com › viewtopic.php
Control multiple device using Timer - ESP32 Forum
September 4, 2023 - So you're not trying to generate ... can only process one timer at a time, though, so if multiple timers fire at or around the same time, they will still processed after eachother, meaning some will 'lag' a bit....
Last Minute Engineers
lastminuteengineers.com › handling-esp32-gpio-interrupts-tutorial
Configuring & Handling ESP32 GPIO Interrupts In Arduino IDE
January 20, 2026 - The ESP32 has a sophisticated interrupt system that can handle multiple interrupts simultaneously, prioritize them, and even assign them to specific cores—making it more powerful than traditional Arduino boards.
ESP-IDF Programming Guide
my-esp-idf.readthedocs.io › en › latest › api-reference › peripherals › timer.html
TIMER — ESP-IDF Programming Guide v3.0-dev-1395-gb9c6175 documentation
The ESP32 chip contains two hardware timer groups. Each group has two general-purpose hardware timers.