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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questions
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Using NeoSWSerial library with EnableInterrupt and a GSM board for Arduino Uno
I've recently bought a SIM5320E GSM shield board for Arduino Uno and I've managed to get it working nicely - to send txt messages etc. The GSM shield can only use pins D2 and D3 for RX and TX. I would ...
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33 views
Faster TimerOne with Teensy 4.0 (600MHz)
I have a teensy 4.0 which runs at 600MHz, and is double superscaler (i.e. can execute two instructions per clock cycle, sometimes). I need an interrupt to happen faster than every microsecond. I've ...
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39 views
Problem with counting inside INT0 ISR while in PowerDown
The issue that I have is in INT0 service in which it doesn't perform properly when MCU is set in PowerDown mode. I declared a global variable as "counter" and put it inside INT0 ISR but its value ...
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1answer
54 views
Missing buffers with serial communication
I am currently facing a problem with Serial communication with my arduino MEGA 2560.
My project is to collect data from an encoder. There are 2 signals : ACP and ARP. For 1 rotation, there are 16 384 ...
0
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1answer
24 views
Behaviour of tone() not as expected within while loop
I have a smoke detector with a piezo buzzer. I want to operate the arduino in low power mode so that it will last on a 9V battery. I've attached an interrupt, and when the digital output of the MQ-2 ...
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1answer
78 views
I2C OLED conflicts with Interrupt
I'm using Nmradcc.h in combination with a OLED I2C.
The nrmadcc.h is using a interrupt 0 on Pin 2, the OLED uses A4 and A5.
After initialisation of the OLED and the Function
The problem is, I can ...
0
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1answer
38 views
How do I code delay inside a ISR?
I have built a basic obstacle avoidance robot. When the sensor senses an obstacle it gives a RISING interrupt to pin 2. At this moment I want the robot to come back for 2 seconds and turn right for 2 ...
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2answers
48 views
Cancelling state of code before going to interrupt
Currently, I have two loops in my Arduino code.
Certain cases take me from loop 1 to loop 2
I also have an ISR
When my ISR condition is met the code is executed and part of the ISR code is supposed ...
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2answers
112 views
Detecting when a timer interrupt does not run
I am dealing with code thatt i received that relies heavily on timer interrupts.
i am using arduino Mega (Funduino)
More specifically, when a signal arrives in a pin, an interrupt is run that starts ...
0
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1answer
34 views
Receive socket when in loop arduino (Interupt a while loop with a socket)
I'm currently working on an arduino project. Were the arduino is communicating with a NodeJS server via web sockets.
The socket connection is working fine and has no problems. But the problem I ...
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30 views
Using interrupts to facilitate time-keeping
I am making a clock on an Arduino Mega using interrupts to facilitate time-keeping. The following is my timer breakdown:
Timer0: Used for my calls to millis() which allows me to determine when a ...
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44 views
Radio receiver: deep sleep when no byte arrives, and wake up when a byte arrives?
This code works to listen for bytes via radio (with a 433 Mhz receiver module) with the Manchester library and Manchester code, and do an action when certain bytes are received:
#include "Manchester....
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2answers
87 views
Disable interrupts when doing critical things?
I've got a few functions like this that log, or do more critical things like get/save configuration variables.
/**
Write weather data to csv
commit: datetime,minHumidity,maxHumidity,...
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3answers
52 views
PCINT0, PCINT1, PCINT2, etc. on ATtiny45/85
According to the datasheet:
we could think that, if we want to have a pin change interrupt for 3 pins, we have to create multiple instances:
ISR(PCINT0_vect){
...
}
ISR(PCINT1_vect){
...
}
...
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84 views
Sparkfun ESP32 WROOM Thing Plus Deep Sleep & Interrupts codes “marriage” problem
Would like to ask for assistance. Tried several routes. My knowledge is lacking and unable to progress further. I think I am very close to the solution (maybe couple of lines of codes away), but the ...
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1answer
161 views
How to assign an interrupt to a button press with an ATtiny? (interrupt not fired with my code)
(Here is finally a solution).
I'm using the following code on a ATtiny45 to assign an interrupt to a button press (pin #7, PB2, INT0). However the LED doesn't blink when the button is pressed, as if ...
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3answers
37 views
ATmega328P - Problem using timer 2 for tone generation
I'm simply trying to use timer 2 for tone generation and what I get is a very faint and strange tone (almost like its modulated somehow as there is a "pulsing" to it). Here's my simple code:
#include ...
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0answers
50 views
RadioHead Library and SPI Device (MAX7219) not working together
I am trying to use the RadioHead Library (receiving a 433Mhz Signal) and an LED Matrix (Max7219 via SPI) on the same Arduino Leonardo.
Now either one works fine when only it is connecting. But when ...
0
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1answer
26 views
Setting a number inside a struct causes timer to misbehave
The following code:
struct l{
uint8_t pin;
uint8_t sensePin;
float brightnessTarget;
uint8_t PWMvalue;
uint8_t inc;
};
typedef struct l led;
led* redLed;
led* whiteLed;
unsigned ...
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0answers
38 views
Multiple Interrupt Pins Generates Wrong Pulses
On MKR WAN 1300 board I added pulldown resistors to 0,1,4,5,6,7,8 pins to count pulses.I can catch interrupts, but sometimes pulses occur on other pins even though they are not touched. For example, ...
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1answer
129 views
Laser Controller using Arduino Uno
---> I am trying to create a controller using Arduino Uno that simply detects pulses from a waveform generator mimicking a Laser Machine and then switches between 4 state machines states at the output ...
0
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1answer
26 views
When does interrupt get fired
When does the ISR mapped to SPI_STC_vect (SPI transmission complete) get fired? Does it fire after a byte has been received (eight clock cycles) of when the slave select changes back to high to ...
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1answer
116 views
real-time reading of a quadrature encoder at full resolution with only one interrupt on ATmega328
I want to read a quadrature rotary encoders at full resolution with only one interrupt on Arduino Nano (ATmega328). So I found out that we can use XOR to reach a full resolution:
Where pin 3 ...
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30 views
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
49 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
63 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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vote
2answers
56 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
243 views
pulseIn on ESP32 return 0 regularly
I'm using pulseIn on an ESP32 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 ...
0
votes
1answer
142 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
42 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
142 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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0answers
89 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 ...
2
votes
0answers
88 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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0answers
36 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 ...
0
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2answers
189 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 ...
0
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1answer
75 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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votes
1answer
74 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
21 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 ...
0
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0answers
21 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, ...
0
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0answers
48 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
50 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
votes
2answers
97 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
170 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
43 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
32 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
24 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 ...
0
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2answers
549 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 ...
3
votes
3answers
884 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 ...
0
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1answer
190 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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1answer
121 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 ...
