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.
0
votes
0answers
32 views
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 (...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
1
vote
0answers
19 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
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 ...
0
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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 ...
0
votes
3answers
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 ...
1
vote
1answer
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 ...
1
vote
1answer
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)...
0
votes
2answers
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 ...
1
vote
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) ...
0
votes
0answers
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(...
0
votes
2answers
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 ...
0
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
1
vote
2answers
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, ...
0
votes
1answer
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>
#...
0
votes
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 ...
0
votes
1answer
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 ...
1
vote
1answer
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;
...
2
votes
3answers
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 ...
2
votes
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 ...
3
votes
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 ...
0
votes
0answers
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 ...
0
votes
1answer
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 ...
1
vote
2answers
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 ...
0
votes
1answer
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 ...
0
votes
0answers
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)...
4
votes
2answers
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 ...
0
votes
2answers
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 ...
1
vote
1answer
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 = ...
0
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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)
#...
0
votes
1answer
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....
1
vote
1answer
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
1answer
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 ...
0
votes
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 ...
0
votes
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() {
...
0
votes
0answers
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
