Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

1
vote
1answer
42 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 ...
0
votes
1answer
33 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 ...
0
votes
1answer
59 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 ...
0
votes
2answers
36 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" #...
0
votes
2answers
52 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 ...
-1
votes
1answer
33 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 ...
0
votes
0answers
32 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 ...
1
vote
1answer
41 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. ...
0
votes
0answers
37 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 ...
2
votes
1answer
61 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 ...
0
votes
1answer
28 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 ...
0
votes
1answer
57 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 ...
2
votes
1answer
52 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 ...
0
votes
2answers
81 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 ...
1
vote
1answer
72 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 ...
0
votes
0answers
51 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 ...
0
votes
0answers
28 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) ...
0
votes
0answers
99 views

timer interrupts on an esp8266

Folks. I'm working on an ESP8266 and keen to switch to using: an object approach -> sorted; physical interrupts on the hardware pins -> sorted; timer interrupts -> driving me crazy! My problems are ...
0
votes
0answers
63 views

Problems reading Ultrasonic Sensor and starting Stepper Motor

I have a problem with my Stepper Motor and Ultrasonic Sensor. I want to have the Sensor reading the distance, and when it is smaller than 20, it tells the Stepper Motor to stop. I can read the ...
0
votes
1answer
40 views

Trying to Pulse an LED a number of times outside of the main loop

I'm trying to call a class function that pulses an LED "x" number of times. I dont want to use a delay, which is making it tough. If I use a while loop, the LED just stays on. I attach an interrupt in ...
0
votes
2answers
73 views

Coin recognition using Coin Accepter in Arduino Uno

I'm working on a vending machine project and I'm using CH-926 and an Arduino Uno for that. I've already set the coin accepter for different number of coins and respective output pulses. I'm unable to ...
0
votes
3answers
97 views

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 ...
0
votes
1answer
63 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 ...
0
votes
0answers
86 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 ...
-1
votes
1answer
52 views

Interfacing MPU6050 with Arduino uno [closed]

What is the meaning of "volatile bool mpuInterrupt = false; " in Arduino Program interfacing MPU6050?
0
votes
1answer
71 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 ...
0
votes
0answers
136 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 &...
0
votes
1answer
83 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 ...
0
votes
2answers
42 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: ...
0
votes
1answer
61 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 ...
0
votes
1answer
32 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 ...
1
vote
0answers
26 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 ...
0
votes
1answer
164 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 ...
0
votes
1answer
42 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 ...
0
votes
1answer
114 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 ...
0
votes
1answer
96 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 ...
0
votes
1answer
104 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 ...
0
votes
3answers
73 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 ...
1
vote
1answer
77 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 ...
1
vote
1answer
46 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)...
0
votes
2answers
34 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 ...
1
vote
2answers
112 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) ...
0
votes
2answers
39 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 ...
0
votes
1answer
44 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 ...
0
votes
1answer
419 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 ...
1
vote
2answers
338 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, ...
0
votes
1answer
268 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> #...
0
votes
1answer
229 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 ...
0
votes
1answer
104 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 ...
1
vote
1answer
103 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; ...