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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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Can Serial be safely used in an SPI interrupt routine

I have anecdotal experience that using Serial.print inside a slave's SPI interrupt routine (ISR) causes issues with transmission. It also seems that interrupts may be called more than once before the ...
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1answer
14 views

How to handle concurrent HTTP request when using interrupt

I'm trying to make a door sensor with a reed switch. Each time the there is a change, the ESP8266 sends an HTTP request to web service. Unfortunately, the ESP8266 serial monitor dumps a huge stack ...
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22 views

Sound sensor connection for Arduino programming [closed]

I am going to make a project by using sound detector. In my project sound sensor provided signal have to connect to Arduino and output from Arduino ATMEGA16U2 is indicator one. When sensor provided ...
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21 views

Encoder code using interrupts design question

I have an Arduino Mega 2560, an Omron Optical encoder with an Index (360 steps), a 60 led NeoPixel ring (no Clk wire) and another Arduino Uno. Here is my question, I have some code written that works ...
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20 views

Interfacing MPU6050 with Arduino uno [closed]

What is the meaning of "volatile bool mpuInterrupt = false; " in Arduino Program interfacing MPU6050?
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1answer
15 views

Mega attachInterrupt on pins 18 or 19 require EIFR bit set first (to clear it)?

Experimenting with external interrupts on a Mega. Pins 2 and 3 work with standard attachInterrupt(digitalPinToInterrupt(iPin),ISR,FALLING); coding and call my ISR. With pins 18 and 19 I had to add ...
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52 views

ATTiny85 arduino interrupt

i would like to know why my code running on the ATtiny85 1Mhz not wake up after the interrupt. I use the ATTiny Core. #include <avr/sleep.h> // Sleep Modes https://goo.gl/Mm7wuk #include &...
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28 views

Does enabling the Timer1 CompareA interrupt instantly triggers an interrupt?

I am learning Arduino interruptions and I am unable to explain the behavior of a minimalistic interrupt driven project. The project is the following: an Arduino UNO is connected to two LEDs, on ports ...
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36 views

comprehensive list of common library methods that do not work in interrupt service routines

Where is a comprehensive and authoritative list of commonly used library or built-in methods (functions) that do not work properly in Arduino interrupt service routines? I am aware of the following: ...
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60 views

Exit for loop with button press

I have looked everywhere and can not find an answer to my problem so I am here as a last resort as I'm pulling my hair out. I'm fairly new to Arduino and have made it this far on my own but now I ...
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33 views

PIR sensor using interrupt always on. Why?

I am using an arduino pro mini 3.3V connected to a PIR sensor ST-00081. The connection is as follows: PIR directly to 3.3v from the PSU board. OUT to arduino pin 3 (2 is occupied). En left floating (...
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1answer
24 views

Running ADC triggered by TIMER1_COMPB

I'm trying to run ADC on channel 0 triggered by TIMER1_COMPB. Everything seem to work ok but basic arithmetics is not working and variables inside ISR and even main loop don't get updated (x == 2 all ...
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19 views

Code working well on Arduino Uno is not working with Mega 2560

Following is the code block from my script. It uses timer1. Why it is not compatible with Arduino Mega? TCCR1A = theTCCR1A; // 0b10000010; /*10 clear on match, set at BOTTOM for compA. 00 compB ...
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20 views

Arduino Swissflow Meter

We've hooked up a Swissflow sf800 flow meter to our Arudino Uno. The system works, our interrupt callback is triggered and as water flows through the metre, it counts up. The issue is, that the pulse ...
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1answer
54 views

Triggering an SPI transfer with an interrupt in Arduino Due

I have a DDS that is controlled by an Arduino DUE, loop() waits for Serial commands and based on them calls one or another function that sets the DDS's frequency, phase, amplitude etc via SPI. In ...
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1answer
28 views

Are hardware interrupts used while controlling an LCD screen using the LiquidCrystal library?

I'm working on a tone generator project that uses Mozzi to make sound (sine waves mainly). As I understand, Mozzi can glitch if used along with hardware interrupts. The plan is to use the classic ...
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1answer
31 views

Capturing interrupt on both edges when it's set on RISING or FALLING

I've been trying to capture rising edge of an IR sensor output. This sensor's Vcc connected to Arduino 5V and it has a digital output pin. I've observed the digital output pin on an Oscilloscope. It's ...
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80 views

Problem with interrupts

Alright. This is what I wanted to do: Make a circuit and code the arduino such that there are 2 tactile switches, each with a predefined pwm value. Whenever any one button is pressed the led should ...
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1answer
49 views

Pull-down resistor value for interrupts

I wonder how to calculate pulldown resistor to make interrupt work? I need to connect 5 buttons to A0 and get pressing event via interrupts. Using different resistors, finally, I made work only 4 ...
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3answers
56 views

How to monitor state of 50 Digital Inputs

Good day. I have a specific project need and I spent the past couple of days searching on forum, blogs, etc and I'm still not clear if that's feasible to do with Arduino or not. I need to monitor ...
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1answer
63 views

Arduino Uno ADCH register stuck at 255 when read from ISR

I'm working on a project that will essentially become an oscilloscope in the long run. I am following this guide. My code is uploaded here for more reference. In my .ino file I have called functions ...
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1answer
39 views

Why can I wake Arduino only once with this code?

This is my enhanced code for a daylight alarm on Arduino UNO with an added MP3-Player. The device is supposed to sleep all the time except when I hit the play button (then it is supposed to play music)...
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2answers
31 views

Timer with ajustable time delay

I have a led strip, and each led should be turned on sequentially, such as this one: [http://1.bp.blogspot.com/-CTT6yvYtdos/VihhhBItwjI/AAAAAAAAAvM/q1jbUylMMdM/s400/ezgif.com-video-to-gif.gif][1] The ...
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2answers
86 views

Elegoo Nano timer prescaler problem

I am trying to use Timer2 on an Elegoo Nano to produce a "tick" interrupt every 10uS. My plan was to set Timer2 to CTC mode with a /8 prescaler (to get a timer clock of 2MHz from the 16MHz chip clock) ...
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34 views

Read sensor data repeatedly after specified time?

I want to read sensor data using analogRead() after every 5ms. I have read other answers to similar questions but what I'm confused about is: let's say, I made a loop to read sensor data using ...
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1answer
42 views

Uno to Mega and where is the error for the interrupt that isn't delared?

I want to read a Omron E6B2-CWZ6C Incremental Rotary Encoder w/Index (360P/R). A couple questions, I found out that an Uno can only handle 2 interrupt pins and I think I need 3 for the Index. What do ...
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30 views

Joystick button press misses with reading xy-axis ADC values?

I'm developing the basic function to work with the joystick module, so I have to: 1. Read x-axis ADC value. 2. Read y-axis ADC value. 3. Read the logic button press. The problem is that I misses the ...
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1answer
326 views

“exit status 1” error when invoking “useInterrupt” method [duplicate]

for context to this post you can catch up on this post I am working with an Arduino Leonardo and Adafruit Music Maker shield. I am trying to use the startPlayingFile method via the interrupt pin ...
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2answers
198 views

How to prevent interference between dc motor and arduino?

It may be already asked question in somewhere but I am struggling! I have a four wheel robot which I want to drive it to perform 90-degree left/right turn, I am using the MPU6050 3dof to get angles, ...
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1answer
137 views

How to avoid electromagnetic interference on ESP32 input

I've realized a simple circuit like the following, in order to implement a rain gauge that I can access via HTTP: With the following sketch: #include <WebServer.h> #include <WiFi.h> #...
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1answer
125 views

Data is not sending to Thingspeak using SIM900 with an interrupt in the code

I'm currently working in a weather station with online recording on Thingspeak. When I send a set of parameters (T, Pressure, Humidity, light), I don't have any problem with sending data. But when I ...
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1answer
41 views

Stabilitiy Problem for Interrupts Code related to Flow sensor

There is a problem with code related in link Interrupts Problem with Flow sensor. Code is working but when I stop the pumps, flow value on lcd is frozen until I reset the arduino. And when I start the ...
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1answer
63 views

data integrity when interrupts are too fast

I have an encoder that fires ~54000 interruptions per second. This is way too fast for my arduino uno. But I'm trying to see what I can get from it anyway. For science. unsigned long tickACount = 0; ...
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3answers
76 views

Is the strange problem I'm having to do with comparing floats?

I have a timer interrupt that controls a stepper motor, on an UNO board. In the interrupt handler it checks the speed of the motor and compares it to the target speed. This allows the motor to ...
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1answer
166 views

Interrupts Problem with Flow sensor

#include <Wire.h> //I2C lib #include <LCD.h> #include <LiquidCrystal_I2C.h> // LCD lib LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); const int pot_pin = A0; const ...
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1answer
50 views

Timer interrupt triggers too often

The following question is based on the Arduino Pro Mini (8MHz, 3.3V) I'm in process of developing (yet another) LED strip driver shield. For that I wrote a simple control loop, that adjusts the ...
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57 views

Can I manually turn on and off the interrupt timers?

Can I manually control(on and off) the interrupt timers of an Atmega328p chip with a push button? If yes, can it be used in compare match mode or input capture? if someone post some examples then it ...
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1answer
201 views

ESP8266 Arduino and Rotary Encoder

I'm trying to use the sketch bellow to work with my WeMos D1 mini (ESP8266 Arduino platform) together with Rotary Encoder KY-040 or MJKDZ, and it's not working for some reason, but the same sketch is ...
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2answers
66 views

Attach Interrupt with Library

I am trying to make a library for Arduino, which requires an interruption, but the problem is that when I try the attachInterrupt function inside my library, there's a problem about attachInterrupt is ...
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1answer
37 views

Unable to send SMS from interrupt routine

I am trying to develop a burglar alert system. I am using PIR sensor, Arduino Mega and SIM800L. I have connected PIR sensor to interrupt pin. Whenever motion is dected, a function corresponding to the ...
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284 views

Simple Timer1 PWM + Interrupt Routine

At the moment I am experimenting with interrupts. With the Arduino Uno I am trying to generate a PWM Signal with the FastPWM (8-bit) Mode (Timer1). void setup() { pinMode(9,OUTPUT); pinMode(10,OUTPUT)...
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2answers
81 views

Interrupts: use of the “volatile” keyword with a structure pointer for button debounce

I've written a small sketch targeted at the Arduino Uno (ATmega328P) to debounce a mechanical pushbutton using the summing/integration technique: #include <IntegratingDebounce.h> #define ...
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2answers
56 views

Is there any version of arduino that can do something like serial interruption?

I am using an Arduino to control servo MX18A by serial, and trying to use computer to communicate with the Arduino by another serial to send commands to Arduino and change the servo control mode. Once ...
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1answer
118 views

Timer frequency calculation for UNO/Atmega328

I must be overwrought or something... I just can't get the calculation of the timer frequency right. I have a 16 MHz crystal on the Atmega328. I want 1 kHz timer interrupt rate. So I chose prescaler = ...
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1answer
40 views

Where can I find the code for Arduino's “attachInterrupt”?

Where can I find the code for Arduino's attachInterrupt function? A search on the Arduino's Github repo yielded nothing. I suspect it might be a wrapper for some avr-libc function but nothing in the ...
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173 views

what is the max frequency of external interrupt for esp8266 arduino?

i am using esp7 with AttachInterrupt() (Arduino) to count incremental encoder. I need to know what is the maximum frequency of pulses that esp7 can acquire. also, need to know what frequency atmega328 ...
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265 views

Pause and resume stepper motor using interrupt of arduino uno

I'm rotating motor using a limit switch and rotary switch. In addition, I added 2 buttons, one for stop and another for starting from the last position with different speeds and steps. Can anyone ...
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0answers
38 views

A32U4 (Pololu ASTAR ) trying to use Analog comparator -> interrupt

Sensor signal is ~0.5V (high). Need to get this detected as interrupt, timing is essential in this case. I found this library, so I dont have to start bit masking those registers (lazy, yes indeed) #...
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1answer
54 views

Float magnet switch interrupts atmega328p and RN2483 sends data

It was so easy to my mind but it is really not. I have a float switch which goes high when water is floating. So I connect the switch to INT0 pin of MCU. So when water is not floating everything is OK....
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111 views

How to add additional millisecond delay to microsecond delay generator

I am trying to make a delay generator. I already found an excellent example in Generating a short pulse after a delay that works in the range from ~5-32767 microseconds (it is limited by a 16 bit ...