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.
435
questions
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Alternative for Particle Photon's Timer
I am converting a program made for particle photon to a Mega, everything is working except for the interrupt timer. The code that is of concern is (it's a .cpp file being included in the main .ino)
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1answer
45 views
Variable updated in ISR is miscounting
I'm using a timer to fire a interrupt in configurable time periods.
In that ISR, a pin is toggled, and a uint32_t variable is incremented.
In the main program, a while loop waits until that variable ...
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1answer
39 views
Attiny85 Watchdog fires only once
I build something like a flashlamp with different modi. From the hardware site it's quite simmilar to the Nanjg105c.
There is a Attiny85 which generates a PWM signal to an AMC7135.
I have one push ...
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2answers
51 views
Interrupt is activated as soon as I insert a jumper wire into the port
I have written a very simple code to test the interrupt functionality of my Arduino Uno expansion board:
const byte buttonPin3 = 3;
void setup() {
pinMode(buttonPin3, INPUT);
attachInterrupt(...
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0answers
24 views
pulseIn on ESP32 return 0 regularly
I'm using pulseIn on an ESP23 for measuring a frequency between 500 Hz and 10 KHz. I measure both the HIGH and the LOW time, as all simple examples suggest. 95% of the time the result is correct, but ...
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1answer
33 views
24/14 second countdown timer or shot clock for basket ball start/stop button doesn't respond well
Start button doesn't respond correctly, i can't figure out whats wrong with the code ? pls help,
this code is for 24 second and 14 second countdown timers in a same unit
comes with three physical ...
0
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1answer
35 views
Is it possible to put priorities between external interrupts?
My question is quite simple. I am using one external interrupt on the Mega2560 to wake it up with an alarm from the rtc DS3231 and record data from sensors for about 30 seconds and I would like also ...
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3answers
47 views
Arduino Uno not working after Short-circuit
While wiring up my new Arduino Uno R3, I accidentally shorted the 5V pin and the GND pin (for less than a sec). It was powered by a 12V 500mAh power supply through the Arduino DC power jack. . The ON, ...
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58 views
How to manage interrupt from accelerometer BMA220?
I would like to use the interrupt register from the BMA220 accelerometer in order to detect high-g shock. I am using a Mega2560 and the sensor is powered by 3.3 V. I use a voltage divider to convert ...
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0answers
51 views
How to wake up Arduino with an rtc?
I am doing a data logger with an Arduino Mega2560 and I want to use a code to make it sleep when no measure is needed and wake it up with an RTC when time comes. The reason I want this is because I ...
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26 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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2answers
66 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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1answer
33 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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1answer
31 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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0answers
14 views
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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0answers
18 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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0answers
34 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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0answers
31 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 ...
4
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2answers
70 views
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 ...
0
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1answer
85 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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2answers
32 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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vote
1answer
23 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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0answers
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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2answers
119 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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3answers
788 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
58 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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vote
1answer
81 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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1answer
98 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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0answers
46 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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votes
2answers
479 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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40 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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1answer
99 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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3answers
88 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 ((...
2
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2answers
59 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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2answers
89 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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0answers
87 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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0answers
22 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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0answers
74 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 ...
0
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0answers
59 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 ...
0
votes
1answer
25 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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1answer
38 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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votes
1answer
95 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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0answers
171 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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vote
1answer
169 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
41 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
351 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
55 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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2answers
130 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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votes
1answer
191 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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0answers
47 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 ...
