Interrupts allow the processor to suspend normal operation temporarily so that a high-priority software or hardware event can be handled instead.
2
votes
3answers
59 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 ...
1
vote
1answer
64 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
37 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
43 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
43 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
44 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
29 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
32 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
61 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
49 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
23 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
35 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
50 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
64 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
24 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
48 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
51 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
61 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
39 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
27 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
40 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
53 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
25 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
76 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
67 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 ...
0
votes
1answer
41 views
attiny85: ISR not triggering for PCINT2?
I am using an attiny85 to read the fan speed reported by a pair of 4-wire fans. I had planned to attach the TACH output from the fans to pins 1 and 2, but I ran into a problem: I was able to handle ...
1
vote
1answer
119 views
how long should interrupting signal last?
I want to apply the interruption of a program with a RISING signal from a pin. How long should the signal rise to be considered as the interruption?
1
vote
2answers
32 views
Strage delay needed after Serial.read()
I'm using a RedBear Duo to read the Serial writes from a RedBear Nano v2. Basically, I use a digital pin of the Duo to raise an interrupt on the Nano. Once, the nano catches the interrupt it writes on ...
0
votes
2answers
138 views
interrupt pin of attiny85 unstable
I'm trying to learn how to program a MC, so maybe I didn't know much about a MC. I tried to test interrupt pin of ATtiny85 with this simple code
#include <avr/io.h>
#include <avr/interrupt.h&...
0
votes
1answer
35 views
trouble getting out of a for loop in a function and go back to a FSM with a button
I have a finite state machine that goes to a function called patternOne, I can't seam to get out of this function though once I am in it and get back to the finite state machine. When I press a button ...
0
votes
0answers
15 views
How use an interrupt function defined inside a class [duplicate]
I want to define only one interrupt function inside a class and then initialize this class with pin number.
This is the Arduino sketch:
#include <EnableInterrupt.h>
class PinTouch {
int pin;...
1
vote
1answer
109 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 ...
1
vote
1answer
40 views
How to stop a loop when using attachInterrupt to catch the change of a button
This what the program does:
There is 1 button to start/stop the engine, when the motor is running
the green LED will go on, when stopped the red LED is on. The second
button is used to change ...
2
votes
3answers
502 views
Can I generate 5 sec delay within an interrupt program?
void buttonPressed()
{
if(ledOn)
{
ledOn = false;
digitalWrite(13,LOW);
}else
{
ledOn = true;
digitalWrite(13,HIGH);
}
vout=analogRead(sensor);
vout=(vout*500)/1023;
...
4
votes
1answer
98 views
Interrupt fires a random number of multiple times for one pulse
This is my first time posting on this forum. I have tried to format this question properly, but let me know if I need to correct anything. I searched to see if someone else had a similar problem, but ...
0
votes
1answer
1k views
MEGA I2C and interrupts on 0,1
Looking at the pinout for the Arduino MEGA:
I see that Pins 20 and 21 can be both SDA and SCL or Interrupts 0 and 1.
If I'm using an Adafruit I2C 16x2 RGB LCD Shield connected to the SDA and SCL ...
0
votes
0answers
37 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: ...
0
votes
0answers
29 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 ...
0
votes
2answers
260 views
Sleep power down mode with change interrupt
I want to use to use an IR sensor as an interrupt to wake up my Arduino Uno R3 from the deep sleep power mode and then go back to sleep after changing the state of the relay.
Lets say if I press a ...
2
votes
1answer
201 views
How to set the sampling frequency in Arduino without using a delay
I am reading an ECG signal using a single lead heart rate monitor. What I know is that when I use delay(15) it means that I am getting 66.67 readings in a second which corresponds to the sampling ...
0
votes
1answer
66 views
What is better approach for non blocking pid algorithm?
I'm developing software side for 3 axes robot where are 360° continuous rotating servos used Documentation here
these servos have its own feedback system so it's possible to control it's position ...
3
votes
1answer
158 views
How to delay properly inside ISR
I am currently working on a little code which needs to react fast. Here is what I am trying to accomplish:
Using a sine wave phase detector I am detecting every zero crossing and feeding that pulse ...
1
vote
1answer
58 views
How to know the external interrupt origin from the ISR
I'd like to know if there is any way to know what is the origin of an external interrupt by programming inside the ISR.
I know I can use a different ISR for each external interrupt and that works but ...
1
vote
1answer
24 views
other interrupts in rc channel reader
I have the sketch from James Waldby (Read RC receiver channels using Interrupt instead of PulseIn) working beautifully. I want to use a switch on my TX to start and stop a sequence of lights (...
0
votes
1answer
101 views
Trigger external interrupt on Arduino Uno R3 with an LED and a button
I want to cause the external interrupt on digital pin 2 (PD2 on ATmega328). I have chosen any logic change mode. Here is my code:
void setup()
{
DDRD &= ~( 1 << DDD2 );//PD2 on input ...
0
votes
1answer
147 views
Interrupt crashes code when implemented
I've got a mini weather-station with a Davis Anemometer Vantage Pro that uses a reed switch to detect rotations. Using the rotations it then can convert to MPH. When using it alone, I have no problem ...
0
votes
1answer
53 views
Propane injection software compiles, uploads, doesn't work
Looking for some help here. I have written out some code to add propane injection for my forklift. It is supposed to read three analog inputs, add them together and multiply the sum by three. There is ...
0
votes
1answer
83 views
I2C Interrupting Loop? [closed]
Imagine i have a code, that loops, and at one point there is i2c request.
Is loop() paused right away when there is Wire.onReceive() or loop is finished then Wire.onReceive() is called?
1
vote
1answer
135 views
Why my ISR is giving impossible values?
I have a very simple ISR:
const uint32_t PATTERN_A = 0xFF00FF00;
const uint32_t PATTERN_B = 0x00FF00FF;
volatile uint32_t count = 0;
volatile uint32_t toggle = PATTERN_A;
// My ISR
void callback(...
0
votes
1answer
921 views
RPM measurement using quadrature encoder
I am trying to build a RPM controller for my project. I am using a quadrature encoder (ppr=400) and Arduino Uno for this purpose. I am using the code given below inorder to caluculate the RPM of the ...
