March 23, 2017 - Calling micros() twice is in a row, takes nearly 50uS. Something line: uint32_t t0 = micros(); uint32_t t1 = micros(); uint32_t delta_t = t1 - t0; printf( "Delta = %u\n", delta_t ); // this prints around 51 on my system. Looking at the i...

What Is micros() and Why Use It? The micros() function tells you how many microseconds have passed since the ESP32 started running. It’s like having an ultra-fast stopwatch in your program.

September 16, 2020 - Hi all, Being aware of the following bug with micros() function in ESP32 arduino, I have jumped into the FOCutils.cpp file and seen that the bug is probably called ☹ The bug is explained here: https://github.com/espressif/arduino-esp32/issues/1168 Trust me micros() is not reliable with ESP32.

May 31, 2022 - Hi everyone, I would like to measure a pulse duration of 32us (4 clock cycles at 125kHz). Therefor I set an interrupt on the according pin. The interrupt is triggered with the rising and falling edge and store the start & endtime with the funktion micros() in two diffrent variables.

August 17, 2023 - The Arduino micros() is a function that returns to you the time elapsed (in microseconds) since the Arduino board was powered up. Which can be used to create a time base for various events in your applications (like LED blinking, short pulse ...

March 3, 2018 - I am trying to use a run-of-the-mill Arduino e-paper display library that happens to watch a certain "busy" pin, and reports debug info via Serial.printf() when the pin appears busy for too long. The code is a delay(1) spin loop, and it is almost instantly reporting timeout. This caused me to write some of my own debug code to test the behavior of the micros() implementation in the HAL.

April 26, 2018 - Hardware: Board: ESP32 DEVKITV1 Core Installation/update date: 25/apr/2018 IDE name: Arduino IDE/IDF component Flash Frequency: 80Mhz Upload Speed: 115200 Description: micros() returns strange values when using arduino-esp32 as component...

I am using a time critial library (MCCI LMIC), that depends on micros() as monotonic time base. In arduino-esp32 micros() is hardwired to esp_timer_get_time(), which does not persist it's counter value during deep sleep. Thus micros() cannot act as a monotonic counter after waking up from sleep.

August 5, 2024 - Dual-core: most ESP32 are dual-core— they come with 2 Xtensa 32-bit LX6 microprocessors: core 0 and core 1. Rich peripheral input/output interface—the ESP32 supports a wide variety of input (read data from the outside world) and output (to ...

4 days ago - Arduino-ESP32 – Arduino core for the ESP32, ESP32-S2, ESP32-S3 and ESP32-C3. ... Mongoose OS – an operating system for connected products on microcontrollers; programmable with JavaScript or C.

October 2, 2025 - The Esp32 web site provides a more advanced install but DFRobot provide a simple esp32 installation for Arduino using the standard Arduino board manager. Add the following url to the board support packages in the visual micro IDE location window or follow the guide

unsigned long ARDUINO_ISR_ATTR micros() { return (unsigned long)(esp_timer_get_time()); } · unsigned long ARDUINO_ISR_ATTR millis() { return (unsigned long)(esp_timer_get_time() / 1000ULL); } · void delay(uint32_t ms) { vTaskDelay(ms / portTICK_PERIOD_MS); } ·

March 19, 2026 - The ESP32, developed by Espressif Systems, is a high-performance, low-power microcontroller designed for IoT, wireless communication, and advanced embedded systems. Unlike the Arduino Uno, it has built-in Wi-Fi and Bluetooth, allowing direct ...

June 16, 2024 - Bring us your Arduino questions or help answer something you might know! 😉 ... Depends what your goal is, but easiest way is a UART connection. RX to TX, TX to RX. Then you can just use the serial library to send things back and forth. Keep in mind the Micro is 5v and the ESP32 is 3.3v logic, so you will need a logic level converter between the two.

January 31, 2024 - In this tutorial you will learn how to connect ESP32 with micro-ROS and ROS 2. You will also learn how to install micro-ROS agent in Linux.

The official Arduino programming language structure reference pages.

June 11, 2021 - //Change the code below by your sketch #define pin 19 volatile unsigned long time_prv = 0; volatile unsigned long time_cur = 0; int time_diff = 0; volatile int counter = 0; void IRAM_ATTR ttt() { time_prv = time_cur; time_cur = micros(); counter++; } void setup() { // put your setup code here, to run once: Serial.begin(115200); pinMode(pin, INPUT); Serial.println("Wait for 2 Sec Delay"); delay(5000); Serial.println("Over and Start"); counter = 0; attachInterrupt(digitalPinToInterrupt(pin), ttt, FALLING); } void loop() { // put your main code here, to run repeatedly: time_diff = time_cur - time_prv; if(time_diff != 0) { Serial.println((60000000 / time_diff)); } }

October 17, 2017 - How to Get an Arduino Micros() Function With 0.5us Precision: I love Arduino microcontroller programming, and I regularly use it in aerospace research, as well as in home projects. As I work on my many home projects, however, I frequently find myself needing a very precise timer.