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Questions tagged [interrupt]

Interrupts allow the processor to suspend normal operation temporarily so that a high-priority software or hardware event can be handled instead.

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Arduino Mega 2560 time delays counting between events on different pins

I am wondering how I can precisely count time delays between rise events happening on 4 different lines/pins using Input Capture of Arduino Mega 2560. How can I synchronize timer/counters? Appreciate ...
Bakyt's user avatar
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Software debouncing a button when released

I'm having some trouble with software debouncing on Arduino UNO. There is a condition in my code where an unwanted debounce registers as a button push. I'm using an interrupt for my button press, ...
Boyfinn's user avatar
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Interrupt protection in ESP32 from interference signals

When my ESP32 is powered with an external 5V adapter or 12V power (2596 DC-DC to 5V), and my water meter (reed switch) is connected with the ESP32, the pulse start running wild and keeps increasing at ...
Just doin Gods work's user avatar
1 vote
1 answer
63 views

Emulating Arduino Uno with QEMU: interrupts do not work

So I wrote this code for Arduino Uno: // file qemu.ino void setup() { Serial.begin(9600); } void loop() { Serial.println(millis()); } And then compiled and uploaded it to the real ...
lch361's user avatar
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2 votes
2 answers
140 views

interrupt from a button and wait until serial port 1 has a message

I'm a little bit loss because I'm learning how to use the interruptions on Arduino. I'm creating a program to read an RFID code that arrives if an RFID transmitter is close to the antenna (a little ...
Aeva's user avatar
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0 answers
38 views

Combining esp_wakeup_timer with external interrupt ext0

I'm working with ESP32-Dev-Kit1 and MMA8452Q accelerometer. I want the ESP to read the accelerometer for 10s, then go to sleep for 10s. If within the sleep period, the accelerometer magnitude reading ...
Lily's user avatar
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1 vote
1 answer
97 views

Fixing a pedestrian traffic light sequence pattern in a cycle using millis and without delay

I was emulating the pedestrian traffic light cyclic pattern (red, green, green flashing) in the next Arduino code. But when I run this code with my ESP8266 Wemos D1 mini controller, it appears the ...
Hong Christian Lin Jiang's user avatar
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2 answers
82 views

I can't get my interrupt to control my project

I'm building a programmable resin pump for my resin printer. The goal is to enable the ability to set a print volume and print time provided by the printer. The pump would then pump at full speed to ...
TheCodeGeek's user avatar
-1 votes
2 answers
77 views

I cannot resolve the errors with attachInterrupt() (error: invalid use of non-static member function) [duplicate]

I have been trying for days to get this code to work, but I cannot find a solution. Can anyone please help me find what I am missing here? My sketch: #include <ControlInterrupt.h> const int ...
TheCodeGeek's user avatar
0 votes
3 answers
120 views

Arduino interrupt for serial data on digital pin, that is too large for the serial buffer

I am using an Arduino Nano in combination with a NEO 6m GPS module. The GPS module is sending data, consisting of a few hundred chars, every second. Since I am communicating with my PC over the ...
Vincent Pruy's user avatar
2 votes
2 answers
1k views

Alternative to polling interrupt flag from main loop?

I am using an ISR, which is written to be as minimal as possible: volatile bool interrupt1{}; void ISR1() { interrupt1 = true; } The interrupt is handled by polling the interrupt1 variable in ...
Erik's user avatar
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1 answer
148 views

Wake esp8266 from deep sleep with PIR but disable while running code

I am using an ESP8266 to control a ring of neopixels. I want to use a PIR to trigger a brief light show. I'm using batteries and need them to last as long as possible. I have it working by checking ...
Eoin Byrne's user avatar
0 votes
1 answer
134 views

Use class object inside an ISR

I have to simulate an ADC that behaves as an I2C slave. The simulated values that the ADC shall expose are sent over serial, saved on an attribute and are requested by a master device over I2C. A ...
lumaca96's user avatar
1 vote
1 answer
112 views

Where to find interrupt flag for 3rd-party Arduino board cores?

This question might be a bit broad, but I'm running into an apparently classic problem with Arduino interrupts, where the rising or falling edge flag is triggered prior to a rising or falling edge ...
E.HP.S's user avatar
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1 answer
47 views

Rising and falling edge on GPIO_STM32G4

I am working with STM32G491RE.I am giving pulse to GPIO pin from function generator. That pulse will be 2 msec on time and 8msec off time.I need to make flag high if the signal from function generator ...
Sireesha's user avatar
2 votes
2 answers
273 views

Using Internal Timer Interrupt to Read Analog Sensor

I'm having difficultly using an internal timer interrupt with my Arduino Nano to properly capture a specific value from a linear potentiometer and then instantly stopping the actuator. I basically ...
wickedhurricane's user avatar
2 votes
2 answers
2k views

How to use Interrupt in Arduino to receive the data from Serial Input

Currently i have a project that forced me to make a program that receives several data from Serial Input using Interrupt in Arduino. I use Arduino as the receiver and ESP32 as the sender through ...
Zero's user avatar
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1 vote
2 answers
171 views

Timer interrupt setup for one second is too slow (~ 4 seconds)

I am trying to use the timer interrupt on an Arduion Uno. Here is a imple example code for displaying a progressive digit on a lcd display, which is updated with timer interupt every second: #include &...
maddes8cht's user avatar
0 votes
2 answers
323 views

ATtiny85 with sleep and serial

I want to communicate over serial to another device (dfplayer) and also set the microcontroller into sleep mode. The ATtiny85 does not have a hardware serial pin so I need to use a virtual serial (...
boop's user avatar
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4 votes
0 answers
255 views

Rotary Encoder with interrupts - erratic behaviour

I'm trying to change my working rotary encoder code (stolen from here) to an interrupt-based code on my Mega2560. The trouble is that the result behaves very erratically, even though the physical ...
Malibu's user avatar
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1 vote
0 answers
143 views

ESP32 trouble with running ledcWrite inside of ISR

ESP32-S2 (Wemos/Lolin S2 mini) Arduino 2.1.1 on Windows 11 Hello, Thank you for taking the time to read this post and for any assistance you can provide. I consider myself a newbie when it comes to ...
Michael.G's user avatar
5 votes
1 answer
247 views

Pin Change Interrupt Flag timing on 1284P

I want to ask about pin change interrupts on a 1284P chip using MightyCore. I have a question about the timing of multiple interrupts on one port. Specifically, if I am servicing a PCINT vector and ...
Delta_G's user avatar
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2 votes
2 answers
564 views

Using interrupts as flags/latches without any ISR

I've got an Arduino Mega periodically running an (~400ms) operation that is sensitive to repeatable timing, so I don't ever want it to be interrupted. But, I'd like to be able to use an interrupt ...
Nicholas's user avatar
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2 votes
2 answers
200 views

Changing SPI ports on an Arduino

My end goal is to read information from an nRF24l01 module connected to my Arduino UNO R3, and generate an interrupt whenever a message is sent to the Arduino. Now, I have read that for Hardware ...
insipidintegrator's user avatar
1 vote
1 answer
235 views

How to make the built-in LED blink with a frequency of 5 Hz using interrupts

The task is: after five clicks on OK, the built-in LED starts flashing with a frequency of 5Hz using an interrupt. After the eighth click on OK, the flashing (and glowing) should stop.Why is flashing ...
Good York's user avatar
0 votes
1 answer
300 views

Why NEC IR remote control decoder does not work

I need to recognize a signal from an IR remote, not to use a library for working with IR remotes/receivers. How can when the button is clicked to display its name. I have PIC12F615 microcontroller ...
Good York's user avatar
1 vote
1 answer
136 views

How can when the button is clicked to display its name

I need to recognize a signal from an IR remote, not to use a library for working with IR remotes/receivers. How can when the button is clicked to display its name. I have PIC12F615 microcontroller ...
Good York's user avatar
1 vote
1 answer
95 views

attachInterrupt has no effect on Industruino SAMD21

I'm using Industruino D21G (SAMD21G version) with Visual Studio Code extension for Arduino. attachInterrupt seems to have no effect. I tried Industruino CH1, CH6 and CH7 with the same result. When I ...
Paul Jurczak's user avatar
0 votes
1 answer
420 views

Why does the interrupt not work after pressing the button

Implement interrupt processing when the button is pressed, and the very start on the rising edge, the interrupt pin and to which the button is connected 11. Why does the interrupt not work after ...
Good York's user avatar
0 votes
0 answers
159 views

SDI-12 protocol, working with SoftwareSerial

I have a Teros 11 moisture sensor that I have managed to make it work with the SDI-12 arduino library. However, this library does not work with SoftwareSerial and this is critical for me. There is a ...
user1584421's user avatar
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2 votes
2 answers
217 views

Tone() generates a high pitched sound when button is released

I have a simple circuit that makes use of the tone() function to produce some sounds. I also have a button, hooked with an interrupt function, that whenever is pressed, a variable changes. Sometimes, ...
user1584421's user avatar
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1 vote
0 answers
326 views

Motor encoder and interrupts

I'm trying to write motor controller for automated blinds using Raspberry Pi Pico with arduino-pico. My problem is that I can't seem to get a consistent result from motor encoders. In my setup ...
Leonti's user avatar
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0 votes
2 answers
134 views

best practice for performance: empty loop() when using interrupt?

I'm working on a little midi hardware project and I'm using attachInterrupt() to assign a callback function to an interrupt pin. Nothing gets done in the loop function, so it looks like this: void ...
strudelkopf's user avatar
1 vote
1 answer
119 views

Checking a thing about interrupts

If I disable interrupts (for example noInterrupts or cli) and enable them (interrupts or sei for example) later, would interrupts which would have executed in the window in between fire by the ...
markoj's user avatar
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0 votes
1 answer
77 views

ATTiny88 missing pulses - maybe

I have been given to understand the ATTiny88 is very similar to the Arduino Uno / ATMega328 MCU. There does not seem to be a tag for the ATTiny88, so that is why I chose the tags I did. I do not ...
Leslie Rhorer's user avatar
2 votes
1 answer
121 views

Is ESP8266 dropping an interrupt?

I want to use interrupts on my ESP 8266 to monitor the digital outputs of a power meter and water meter. The idea is to increment a counter in the ISRs and at some point to take the value of the ...
Plamen Peev's user avatar
0 votes
1 answer
237 views

DS3231 with Arduino Nano for Timing precision

I am in need to synchronize two separate circuit boards working with Arduino nano. The need is to activate one relay using Arduino-1 after 45 min and another relay using Arduino-2 after 45.36 seconds. ...
Lawliet's user avatar
  • 183
2 votes
2 answers
216 views

Arudino receiving interrupt command BEFORE entering sleep mode causing it not to receive any interrupt commands in order to wake up

I've written code for an Arduino Nano that when a button is pressed, it sends an IR command. It is set so that if no button press has been received for a period of 10 seconds, it will enter sleep mode ...
99natmar99's user avatar
0 votes
1 answer
583 views

Arduino nano timing precision

How precisely can an Arduino nano be timed? The project I am working on needs two Arduino nano to work synchronously. Arduino one have to activate a relay after 2700 sec and Arduino two have to ...
Lawliet's user avatar
  • 183
0 votes
3 answers
2k views

Interrupt on button press + debouncing

I want to have an interrupt function executed whenever a button is pressed. The button is connected to pin 2 and the GND. Therefore, the pin is turned to LOW whenever the button is pressed. In ...
user1584421's user avatar
  • 1,405
1 vote
1 answer
73 views

Fubarino (microchip pic32mx), Second timer interrupt is not firing

volatile uint32_t counter_timer = 0; void __USER_ISR myISR() { counter_timer++; clearIntFlag(_TIMER_3_IRQ); } void __USER_ISR myISR_timer_four() { clearIntFlag(_TIMER_4_IRQ); TMR4 = ...
NaturalDemon's user avatar
2 votes
1 answer
764 views

Attiny timer interrupt does not make an interrupt every 1000ms

I'm making a stopwatch using an attiny85, the idea was to use the timer interrupts to count the seconds my theory was: since I set the Attiny85 to run at 1Mhz, I can use a presale of 1024; 1000000 / ...
Isael Guillén's user avatar
0 votes
1 answer
267 views

Why doesn't my mcp23s17 interrupts work anymore?

I'm using a teensy 4.0 with two mcp23s17 gpio expanders where #1 has 16 buttons wired to it, and #2 has 4 buttons and six rotary encoders. To run everything I'm using majenkos mcp23s17 library. ...
Erik's user avatar
  • 261
-1 votes
1 answer
84 views

Share interrupt service between class

I would like to share interrupt routine between class. I followed this tutorial. But I need to call a member function in callback function, I have the issue : This is my code : Timer.h static void (*...
oAGAo's user avatar
  • 3
-1 votes
1 answer
540 views

Stopwatch stop/start button and reset

i am trying to make a stop watch with a stop/start button and a reset button i have made this #include "RTClib.h" //Setup the Real Time Clock, DS3231 RTC_DS3231 rtc; const byte SQWinput = 2;...
Amr Ahmed's user avatar
-1 votes
1 answer
238 views

`noInterrupts()` causes the arduino to no longer appear in ports

Minimal working example: void setup() { // initialize digital pin LED_BUILTIN as an output. noInterrupts(); pinMode(LED_BUILTIN, OUTPUT); } // the loop function runs over and over again forever ...
beyarkay's user avatar
  • 111
0 votes
2 answers
226 views

External Interrupt not working on 3.3V atmega168

I made a 3.3V board and I've put both atmega328p (that I pulled off of a 3.3V pro mini), and an atmega168 that I bootloaded (using USBtinyISP whilst selecting board "Arduino Pro or Pro Mini" ...
Troy Cados's user avatar
-1 votes
1 answer
34 views

Interrupt is sporatic, potentially after 220Hz or so

Background although likely not needed: I am recieving a frequency on the destination side of a opto isolater. A fan trips a hall effect sensor, and grounds a circuit which lights the opto. On the ...
Rob Stoner's user avatar
1 vote
1 answer
138 views

Help with Arduino sleep and watchdog timer interrupt

I want to use Arduino's sleep and wakeup functionality but have hit a roadblock and can't seem to get past it. As I am just prototyping for a final system, I cannot use the LowPower library to ...
phizaics's user avatar
-1 votes
2 answers
302 views

Can't make attachInterrupt() work

I have an accel+gyro sensor connected to an Arduino Zero. It's configured to output an interrupt signal on pin 2 when tapped. I can do a digitalRead() on the pin, and it does go high, so the interrupt ...
Zhelyazko Grudov's user avatar

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