Comments on: ESP8266 Interrupts and Timers using Arduino IDE (NodeMCU)

By: Hans

Hans — Mon, 12 May 2025 11:00:54 +0000

In reply to Sara Santos. yes but I need different sounds and a active buzzer isn't able to do. A passive buzzer is but there is the same problem as with a speaker.

By: Sara Santos

Sara Santos — Mon, 12 May 2025 10:56:46 +0000

In reply to Hans.

Have you tried using a piezo buzzer?
Regards,
Sara

By: Hans

Hans — Sat, 10 May 2025 10:35:34 +0000

Hi Rui and Sara,
I’m looking for a routine that can play a sound while a LED is flashing. All I tried failed as the LED ist stopping flashing during sound is playing. It’s for the sketch provided on Instructables project (instructables.com/ISS-Antenna-Indicates-When-the-ISS-Is-Overhead/). I would like to play sound if ISS is within 1000km distance and another sound if it is within 500km range.
Can you help me?
Best regards from Belgium to Portugal
Hans

By: Nimantha

Nimantha — Mon, 17 Feb 2025 08:00:28 +0000

Very use full Thank You So much

By: Robert Johnson

Robert Johnson — Thu, 17 Oct 2024 21:35:55 +0000

In reply to Sara Santos.

Sara,
Great article. It would be helpful to comment in the text on the role of the ICACHE_RAM_ATTR attribute and why it is used. ICACHE_RAM_ATTR places the code in internal RAM which is much faster than FLASH RAM and an ISR needs to be as quick and short as possible.
Kind regards,
Robert

By: Jorge Vila

Jorge Vila — Sun, 12 Nov 2023 23:06:35 +0000

hello
I would need to use an ESP8266-01 but I need an interrupt because I need to use the RCSwitch.h library to receive 433Mhz RF sensors
I looked online and couldn’t find this information.
That’s why I’m turning to GURUS who are experts in this area
The idea is to use that module that already has a relay, LED, regulator, etc. where the ESP8266-01 fits
thanks

By: Daniel Thackeray

Daniel Thackeray — Thu, 05 Oct 2023 22:36:07 +0000

startTimer and lastTrigger should be declared as volatile, otherwise the main loop might use a value for these variables that is not the most recent value set in the ISR.

You can’t just wire up a 5V PIR to VIn and expect it to work properly with a 3.3V ESP8266. You must insert a voltage divider into the data input.

By: Shashi Kiran

Shashi Kiran — Thu, 24 Aug 2023 12:41:24 +0000

Hello,
I’m connecting the PIR sensor data pin to Pin 13 of the ESP32 Webcam, and I’m getting an error,
===========X== Cut and Paste ====X===
8:06:42.048 -> [E][camera.c:1327] camera_init(): gpio_install_isr_service failed (105)
18:06:42.048 -> [E][camera.c:1406] esp_camera_init(): Camera init failed with error 0x105
==X == Done ==X==

I did Google and did not find any workable solutions.
Is this ISR good for Webcam -ESP32 as well.

I found another similar example/sketch/source code in your randomnerd tutorials website for the PIR sensor and Webcam , and still getting the same error.

Appreciate a reply.

By: Claudio Beringhs

Claudio Beringhs — Mon, 07 Aug 2023 21:13:12 +0000

In reply to Rui Santos. Rui, good afternoon How many interrupts can I use on NodeMcu, since there are 2 on Arduino?

By: Cepi burhanudin

Cepi burhanudin — Tue, 19 Jul 2022 10:26:29 +0000

Halo tuan baga mana cara agar hal tersebut bisa di gunakan untuk pengaturan kurva pengapian kendaraan bermotor.harap bimbingan nya