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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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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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18 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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12 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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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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34 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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25 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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46 views

Interrupt False triggering

Greetings of the day, i have been working with embedded systems for quite a while now, currently i am working on a project that dispenses water depending upon the balance from rfid card, however the ...
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29 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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77 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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37 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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49 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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61 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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36 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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29 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
75 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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48 views

Sleep code inside a function not working

I have this sleep code working inside my loop(): noInterrupts(); attachInterrupt(1, wake, FALLING); EIFR = bit(INTF1); // clear flag for interrupt 1 /* Brown out detector disable */ MCUCR = bit(...
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31 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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41 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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26 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
311 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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181 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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104 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
107 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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33 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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59 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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74 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
136 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
47 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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50 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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164 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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60 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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36 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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216 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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73 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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55 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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98 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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38 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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160 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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236 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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34 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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52 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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99 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 ...
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1answer
191 views

Timer2 Compare Interrupt not working as expected

To get this out of the way first: I have already looked at "Timer2 does not work as it should" and "Timer2 “Clear OC2B on Compare Match” not working as expected in CTC mode" but have not found the ...
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1answer
103 views

TimerOne Library - Response time

I'm trying to write a library for (rather slow) communication with visible light and have recently tried to include the TimerOne library as a timer. I want to send bits at 2kHz, so with a period of ...
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76 views

LiquidCrystal library and timers don't seem to be compatible

If I set timer2 to Compare Match mode, my LCD display stops working. If I use Overflow Interrupt it works fine. Here's my test code. I have a loop() function which does its thing, and a timer ...
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1answer
59 views

atmega88 timer2 32.768KHz and Serial problem

I am trying to use atmega88 timer2 with a 32.768KHz crystal. I'm using a slightly modified version of Nick Gammon's code. I am using Minicore. No bootloader, 1MHz clock from internal oscillator, BOD ...
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1answer
131 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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33 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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3answers
342 views

Using attachInterrupt() to make a reset button for my code?

I have used attachInterrupt() to reset my program to the beginning. It actually interrupts while running the 3 states as shown below inside of the if statement but when I press the actual button it ...
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129 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 ...