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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21 views

Possible race condition using ADXL345, external interrupts and sleep

Setup: I have an Adafruit ADXL345 attached to an Adafruit feather 32u4, via I2C lines and an interrupt line. Goal: The microcontroller should be in a sleep condition when acceleration values are ...
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58 views

how to interrupt the loop function and restart it?

I have a project with some NeoPixels and other LEDs and an Arduino UNO. Once switched on, the defaultLEDAnimation with colors and blinking, etc. starts. I want to trigger some other animations, so I ...
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14 views

GY91 IMU module, Interrupt?

Are there interrupt Pin in the GY91 Module? If not, are there good alternative for periodic sensor reading? (apart from mcu schedule/external timer)
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25 views

Does DmxSerial stops interrupts?

I am trying to build a setup with an Arduino Mega, having a DMX output (using DMXSimple library), and a MIDI library (to be done). I was wondering, if I get into problems. According to This question, ...
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Why is my quadrature encoder writing as irregular intervals in serial monitor after working fine?

I'll try to keep this brief and add code/output at the bottom. I am using an Arduino Uno with a Pololu motor shield and two Pololu motors. I am driving speed control using the encoders at the ends of ...
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16 views

How to adapt this code using a DF Mini Player and interrupts for the ATTiny85?

So I programmed my Arduino Mega 2560 to play certain sound effects from a DF Mini Player that I have. I took the base code that I modified from online so some fo the names might seem odd. Currently, ...
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29 views

How to get interrupt while in sleep mode?

I am using Arduino-uno, attached ESP-01 module I want to give interrupt when I send some wifi-signal to arduino, which is in sleep mode. so I write this code: SoftwareSerial esp(2, 3); // RX, TX ...
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28 views

Combining ADC IRQ with SPI peripherals results in SPI not working

I'm working on a pet project that requires ADC, SD card (SPI interface, SdFat library) and a display in the future (also SPI). I have put together a piece of code that initializes ADC at the highest ...
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Writing to sd card with a sampling rate 50ms or less? I have a sketch that writes to sd every 1s but jams at faster sampling rates. Please help?

My code below reads data from an ADC and 3 digital pins via a Mega and prints to an SD Shield (Deek Robot). I want to be able to read the data every 50ms (20ms ideally). I can't get below 250ms. I've ...
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1answer
48 views

ESP - Nodemcu amica - attachInterrupt crash program

I get new boards from the shop but they are little different from the previous version. I got software what works ok on Nodemcu lolin v3 now I get Nodemcu Amica what is almost same board but if I got ...
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25 views

Atmega collecting and relaying interrupt calls

I like to collect all possible interrupt and relay them to an alternative handler interrupt table what the user can set. In order to do this i have to: 1) collect all/any interrup request 2) ...
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17 views

Timer 1 COMPA ISR - default behaviour?

I'm creating a LCD frequency generator. When TIMER1 reaches a set value, it's set to toggle Pin 9 (via OC1A). Accidentally, I left the TIMER1 "interrupt on compare match A" enabled, but never ...
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23 views

How do I have this audio and LED activate ONLY when a button is held using an Arduino?

I have this code that I am using to play a sound effect where I used a program called wav2c to convert a .wav file to number values that I put into a header file that I use in the code to generate the ...
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83 views

Debouncing a button with interrupt

I tried to follow the answer here: https://arduino.stackexchange.com/a/18545/51302 Unfortunately I can only get the interrupt to go once (on serial monitor is the time of that first interrupt), then ...
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758 views

What is the right way to query an I2C device from an interrupt service routine?

The ADXL345, for example, requires that interrupts are responded to by querying the INT_SOURCE (interrupt source) register. In example code for the SparkFun ADXL345 Arduino Library, there is code that ...
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1answer
45 views

Rotary encoder using interrupt

This is my first time working with a rotary encoder and interrupts. I am using a Pro Micro which has interrupt pins at pin0 and pin1. The code below works as expected. My question: do I need to use ...
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73 views

analogRead() output oscillates even though the pin is grounded

I'm using Arduino Micro to read from 5 flex sensors and display the corresponding angles to the Serial monitor. I am currently having quite some problems with the oscillating values I am getting from ...
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93 views

Interrupts arduino interrupting serial comunication

I have problem with communicating VB.Net-Arduino. It seems the interrupt pause my serial communication line in void loop() { ... }. I don't know what to do, and I can't erase interrupts line since I ...
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42 views

Why does my TFT keep turning white after moments?

Alright, seems there is something wrong I am doing that I don't understand. Before I start explaining, my question is different than this white screen question. First of all my TFT ST7735 is working ...
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219 views

Constant ADC sampling rate on ESP8266 or ESP32

I want to sample Sound input with either an ESP8266 (preferred) or ESP32. As I'm using a low pass filter anyway, a sample rate of 1000-2000hz would be totally ok. What is more important, is that it is ...
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39 views

MEGA2560 only starts program after pressing RESET button multiple times

I am working on a program where I am controlling an MP3 player by using UART between my MEGA2560 and the MP3 player. The MEGA2560 sends serial commands to the MP3 player when external interrupts are ...
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59 views

External Interrupt Pins on Nano Clones

Long time lurker, first time poster here. Do the cheap Arduino Nano clones such as this one have external interrupt pins? For example, the original Nano has pins 2 and 3 usable for interrupts. Do ...
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63 views

Can arduino interrupts occur in a middle of if statement?

I got an issues from few days, got some code which reset millis time on successful i2c communication, if not it restart an relay after specified period of time. Here is part of the code: if ((...
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56 views

RGB LED Mode toggle - Trying to avoid using main loop()

I'd like to start by saying that I have only been dabbling in electronics (not just Arduino) for about 3 days now. I am trying to write a sketch which changes an RGB LED when a push switch is pressed....
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53 views

Two rpm counters with interrupts

Can I use two interrupts on to count rpm square signals coming from two hall effect sensor modules (that has built in comparators to generate square signals) ? What if two signals come together ? ...
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63 views

High speed rotary encoder with Arduino MEGA

I'm trying to develop length measuring system and I'm using a industrial rotary encoder as the sensor. A have decided to use an Arduino external interrupt for connect the encoder. But, Encoder will ...
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19 views

Moving timer-related code into a separate file causing timing inconsistencies?

I have written the following code, attempting to re-implement the Arduino micros function: main.c #include <avr/interrupt.h> #include <stdbool.h> #define CLOCK_CYCLES_PER_MICROSECOND (...
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49 views

MPU-6050 Interrupt Sample Code

does anyone know where I could find some working code the demonstrates how to use the interrupt pin on the MPU-6050? My goal is to be able to shake the sensor in order to trigger an interrupt which ...
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55 views

Using Sleep with Interrupts

I have 2 doors closet, that I want to lit when door is open. I use 2 prox sensors to detect state, an Arduino Pro mini, and 2 led strips. I use same code and hardware ( minus not needed doubled ...
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1answer
24 views

ISR definition causing boot loop?

I am trying to compile and upload code to an Arduino Uno from the command-line, however I seem to be experiencing an odd issue. When I compile this code: #include <avr/interrupt.h> #include &...
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35 views

Arduino Mega - Enabling CTC mode disables timer

I'm trying to use timer3 on an Arduino Mega 2560 in CTC mode. However, enabling CTC disables the code entirely. Here is the function I call in setup() to setup the times. void SetupInterrerupt() { ...
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62 views

Passing variables for a PID in an interrupt

I'm needing to pass variables from my timerIsr() function to my loop() function. I have little experience with the Arduino language, I'm mostly familiar with Python so this has been quite difficult ...
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111 views

where is avr\interrupt.h on a Windows installation?

I'm trying to move from the Arduino IDE to Visual Studio Code. I have a program that uses interrupt.h #include <avr/interrupt.h> but it's not being found because it's not on the include path. ...
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106 views

Measure cycle count and time of Digital Input

I am currently working on a project which is read a digital input signal from a machine. The machine operation is as below: when the mold close, the machine gives the "HIGH" signal, when mold is open ...
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1answer
37 views

How do I redefine the overlfow of compare interrupts in Arduino programming?

If I'm programming a pin change interrupt I can call attachInterrupt at various points in my code and change what function is called when the interrupt occurs. The overflow and compareA/B interrupt ...
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1answer
200 views

set arduino own timer about 5 minutes

I want to program arduino uno by using it's own timer , which instructions and codes should be used if i want timer to be set for 5 minuets and then warn me about an event , the problem is that , the ...
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2answers
49 views

Interrupt triggering using DHT-11

I am new at arduino. I want to write a sketch that would print the message if the temperature grows greater than 30 C. Here is my sketch can you please tell me what's wrong with it #include "DHT.h" #...
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102 views

Reading inside critical sections from ISR

Is it necessary to protect reads of volatile variables in critical sections when using interrupts? Or are critical sections only required when concurrently writing variables? Here is an example of a ...
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119 views

Enable and disable individual interrupts

I am working on timer interrupts and external interrupts. for external interrupts I understood the functions like attachInterrupt. detachinterrupt for individual interrupts ,noInterrupts() and ...
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44 views

Arduino stuck when I disable Timer 2 Interrupt

#define TIM2_EN() (TIMSK2 = 0x02) #define TIM2_DIS() (TIMSK2 = 0x00) //HEART SENSOR // Include Libraries #include "Arduino.h" class PulseSensor { public: static void begin(int pulsePin); static ...
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1answer
54 views

Force TCNT to stay below OCRxA on ATmega328P

I'm using a timer and the TIMERx_COMPA ISR to generate a signal in "the background". This ISR is triggered when the timer reaches a certain value (OCRxA), which in turn can be changed by the user. ...
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102 views

How to attach interrupt to RBDlibrary?

I am pretty new to arduino programming. I want to use the library from the Robotdyn dimmer modul with a arduino uno and a encoder with lcd for a menü but if i attach the interrupt for the encoder (on ...
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1answer
98 views

Cannot set MOSI pin low even after ending SPI

I'm building a battery operated device and must shutoff MOSI pin during sleep because it leaks current through the SD card if I don't (about 400 µA). Problem is, it won't stay off. I've looked at ...
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1answer
46 views

Converting code for ATTINY85 to ATMEGA2560. Pin change interupts

I have code that compiles correctly for an ATTINY85 board using the ARDUINO IDE but I don't have an ATTINY85 board. I have an Arduino Mega ATMEGA2560 and when I select this board in the Arduino IDE ...
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1answer
103 views

How to use one button with interrupt to enable and disable sleep mode?

I have written a program for a kitchen timer. The timer uses just one single rotary encoder with a push button on its axis. It has modes for counting up and for counting down. After counting down it ...
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1answer
144 views

attiny85 reset itself instead of wakeup procedure

I have a digispark attiny85, and I am using SLEEP_MODE_PWR_DOWN to sleep, and wake-up with external interrupt on pin2. I am trying to count number of interrupts received with the code below. Problem ...
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110 views

What functions are disabled with noInterrupts()?

The Arduino page for noInterrupts() says: Some functions will not work while interrupts are disabled, and incoming communication may be ignored. While it may not be possible to give a complete ...
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99 views

Motors triggering Interrupt

I am using a 4wd robotic car to measure straight distances. I have attached two encoders on the front two wheels to measure the distance and I am using the back two wheels to adjust the car and keep ...
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107 views

Arduino Pro mini does not wake up after a few interrupts from DS3231

I hope someone can help me. I'm building a GSM water level meter that runs on solar power, using an Arduino pro mini, DS3231 RTC, JSN-SR04T - ULTRASONIC SENSOR, SIM800L along with a DFrobot DFR0535 ...
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38 views

Arduino SPI ISR

Is there any way to trigger a ISR after a SPI transfer is complete? I am trying to send messages from one of three LORA radios and have the other two read the message. I am using the Radiohead (RF95) ...