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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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Leonardo-based tachometer?

I'm new here. I'm not a native speaker, so pardon my English. I just received my Arduino Leonardo today. I tried some basic calculations and stuff like blinking and LCD interfacing. Its interesting. ...
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1answer
567 views

Using INT2/3 on Arduino Micro (Atmega32u4)

My project is using almost all the pins on this board and I require an interrupt pin to read radio state (rather than polling). I'm using I2C, so that leaves INT2 and INT3, which are the TX and RX ...
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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 ...
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1answer
546 views

Timer0 overflow interrupt not working

I try to use the Timer0 of an Arduino Leonardo (ATmega32u) to trigger an interrupt at regular intervals, using plain avr-gcc (not the arduino library). I try to blink the built-in LED as test, but it ...
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1answer
1k views

Hardware Interrupt Triggered Randomly

So there is this pretty generic part of my project that involves triggering an ISR that will flip a boolean value. I have set up the software side like so: void setup() { attachInterrupt(...
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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 ...
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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 ...
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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 ...
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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 ...
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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> #...
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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 ...
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1answer
208 views

generate two phase-shifted PWM pulses triggered by frequency-divided external signal with Arduino uno?

I have a 4kHz pulse as trigger and I need two phase-shifted PWM output with divided frequency from arduino uno. Now I've managed one PWM output using the following code: int cnt = 0; void setup() { ...
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609 views

Arduino Zero - Stepper control (interrupt)?

I have a stepper controller board that I need to pulse every 40 uS or so. I also have I2C sensors and Serial writes to preform. Currently I run an update call in a tight loop, but the I2C sensors ...
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1answer
385 views

Having issue using Arduino IRQ handler in nRF51822

Could anyone please help me as I currently using nRF51822-Arduino library with a nRF51822 chip and I couldn't call the interrupt function, wakeUp(). Currently I connect the external interrupt pin to ...
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0answers
439 views

Arduino nano clone problem with interrupt on falling edge on pin 2

I've s 1Hz square wave coming from a DS1307 SQW/OUT pin going into pin2 on the Nano that is set up as input with internal pullup enabled. I've set up the interrupt on falling edge but I can't get the ...
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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 ...
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119 views

Threshold to wake up signal

I have a sketch to put to sleep and wake up an arduino mini pro 5V, but the problem is that sometimes when it is moved fast it wakes up itself, thing that I do not want. I have it configure to be ...
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98 views

Interference in readings

I have an project which control a heat exchanger. I read 4 temperature sensors DS18B20, a distance with HC-SR04 Ultrasonic Sensor, and a flow with YF-S201 (with attach interrupt). I can turn on and ...
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0answers
592 views

ATtiny85 Comparator C interrupt on timer 1

I have a program that uses Timer1 comparator A in CTC mode. I realize that I need to set OCR1C for the timer to reset at given value. However there is no such thing as an interrupt generated by timer1 ...
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288 views

Use input capture for multiple sensors simultaneously

I want to accurately time multiple digital input channels (readings from sensors) for the rising and falling edges. I need the precision of the Timer1 Input Capture. As far as I know the input capture ...
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0answers
48 views

Serial Write fails to send when Motors moving

I have an unusual bug with the code I have written for my rover V2 robot. I have a raspberry pi running some computer vision code written in opencv tracking an object doing the heavy processing. ...
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0answers
180 views

attachInterrupt HIGH

I'm trying to understand the implementation of attachInterrupt. For LOW, CHANGE, RISING and FALLING it seems simple enough; it sets some chip-specific registers and stores the given callback in ...
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0answers
249 views

Rotary Encoder on LoLin NodeMcu increases value when rotating right/left

I have a test program running on my LoLin NodeMcu board, with a Rotary Encoder connected. I use Task.h and RotaryEncoderTask.h from this library: https://github.com/Makuna/Task (though my issue is ...
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0answers
109 views

Arduino Record pulseIn

I am currently working on a project which requires me to record IR signals. (I realize there is a library available for doing this but I want to learn how to do this myself). I tried using a simple ...
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0answers
662 views

Interrupt for traffic light

I have mini project which is Emergency Traffic Light for Ambulance, police etc. What I am try to do is when emergency traffic light go through first sensor 1 (in this code I just using button, “SA”), ...
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338 views

configuring DMP DataReady Interrupt

My project requires reading sensor values at 10ms (100Hz). I would also want to configure FIFO to update every 100ms, and send an interrupt so that I could read those values,therefore reading one ...
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29 views

vrdude stk 500 not responding error inspeed control of dc motor using arduino uno board .how to solve this issue

vrdude stk 500 not responding error inspeed control of dc motor using arduino uno board .how to solve this issue
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433 views

Interrupts detach

I need to stop 1st interrupt from 2nd interrupt till 2nd interrup finish work... How can I do that? Here is my 2nd interrupt: void CHECK_IR(){ detachInterrupt(0); if (irrecv.decode(&results))...
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511 views

Motor shield causing problems with interrupts?

I am making a controller for a model railway turntable and I need to control a single DC motor and read a hall effect sensor. I have the hall effect sensor connected to pin 2 on my Uno (since 2/3 are ...
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807 views

Understanding types of timer interrupts

I'm learning this note about timer's api on Arduino Due. Interrupt can be attached with the next function: void tc_enable_interrupt( Tc * p_tc, uint32_t ul_channel, uint32_t ...
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665 views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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440 views

ADXL345 Arduino UNO data_ready interrupt

I would like the sensor values to be updated each 10ms(100Hz) and then run the algorithm and repeat the same process. However, after timing the algorithm it is taking only 2ms, I think the data_ready ...
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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 ...
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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 ...
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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 ...
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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) ...
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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 ...
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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 ...
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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 ...
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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 &...
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0answers
75 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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229 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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38 views

StepperLab3 library and Liquidcrystal

I want to control a stepper while displaying user menus on a freetronics style 16x2 LCD. I'm using liquidcrystal for my menus and in order to get non-blocking control of the stepper I've imported the ...
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204 views

limit switch and external interrupt

The INT0 pin of a custom Arduino-like board based on Atmega16 is configured in INPUT_PULLUP mode and connected to a N.O contact of a limit switch, the other end of the switch is connected to GND. in ...
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69 views

Baud rate dependency

I am currently trying to write (obtain) a code for getting raw acceleration values and yaw, pitch and roll angles using these Jeff Rowberg's examples. I have used MPU6050_DMP example to get this code: ...
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31 views

Timer Interrupt Default Settings

so I am testing out the PulseSensor code from here: https://github.com/WorldFamousElectronics/PulseSensorAmped_2_Sensors/tree/master/PulseSensorAmped_2_Sensors_1.5.0 In the interrupt.ino file, there ...
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980 views

Measuring Time while using interrupt pin

I have a very fast signal connected to pin2 of an Arduino Mega 2560. The signal is a square wave of approximately 500 000 Hz. I would like to measure the frequency of this signal. First approach ...
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214 views

Ir sensor wakes Arduino too often from sleep

I have an arduino which I want him to sleep till he gets something from the IR sensor. I wrote my code according to this post: IR Receiver interrupt and arduino sleep mode The most important part ...
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183 views

Are (how much are) interupts interfering I2C or SPI communication?

I am thinking over an autonomous rover. One of the features/components of the rover will be ability to know how fast is the rover moving and what distance did it travel. I would like to use ...
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487 views

How to change MPU 6050 Interrupt Pin number?

I'm working with MPU6050 and I want to use a different Interrupt pin(Pin18) in Arduino mega2560. How to use attachInterrupt() here? #include<Wire.h> const int MPU_addr=0x68; int16_t AcX,AcY,...