Interrupts allow the processor to suspend normal operation temporarily so that a high-priority software or hardware event can be handled instead.
1
vote
1answer
25 views
Can external interrupts be OR'd together on the '328 (Uno)?
I'm thinking about how to handle a rotary encoder. I'm planning on using interrupts and would like to use both the 'A' and 'B' phase transitions to generate interrupts. I'm wondering if there is any ...
1
vote
1answer
36 views
Hardware Interrupt Triggered Randomly
So there is this pretty generic part of my project that involves triggering an ISR that will flip a boolean value. I have set up the software side like so:
void setup() {
...
0
votes
1answer
29 views
Having issue using Arduino IRQ handler in nRF51822
Could anyone please help me as I currently using nRF51822-Arduino library with a nRF51822 chip and I couldn't call the interrupt function, wakeUp().
Currently I connect the external interrupt pin to ...
4
votes
1answer
139 views
How to properly use volatile variables in Arduino?
I was doing a small project with an Arduino Uno. It involved interrupts as I am using encoders to measure how much the differential wheel system moves forward. My robot moves only forward. So I use ...
0
votes
2answers
40 views
Arduino countdown timer for repeating actions
I have tried to find simple library for triggering timer after some time.
The idea is to retry network connection (RF24 network library).
I have following code now
while(!mesh.write(message, ...
0
votes
1answer
20 views
Are INTx pins the only ones eligible for Software Serial?
As opposed to PCINT (Atmel's Pin Change INTerrupt, INTx is arduino-compatible interupt) In other words, does Software Serial use atmel's pin change or arduino falling interrupt?
0
votes
1answer
30 views
Erroneous sensor reading while connecting extra load
I'm making a speedometer using arduino. I've made use of the interrupt pins to achieve the same. My problem is with the power source. I'm using a 12 V battery supply to power the arduino and I'm also ...
4
votes
2answers
55 views
Trouble with Timer 0
I'm taking my first wobbly steps outside the Arduino IDE and I'm not having much success with timers / interrupts. I can set a pin to output and light an LED with registers fine but I cannot for the ...
1
vote
1answer
83 views
Why does my Arduino keep waking up?
This is my first post. Please excuse me if this is a repost, but I couldn't find a similar question via search.
I have some experience with Arduino and I'm looking to utilize AVR's sleep mode in a ...
1
vote
2answers
123 views
Read RC receiver channels using Interrupt instead of PulseIn
I am designing my own quadcopter control algorithm, whereby I currently read 4 RC receiver channels using PulseIn on each loop in the following manner:
ch1_raw = pulseIn(rcPin1, HIGH, 25000);
In ...
1
vote
2answers
122 views
Interrupt on Analog Port - ESP8266 w/ Arduino
I'm trying to implement interrupts in my program. It essentially is constantly reading a photo-resistor and if it exceeds a certain threshold, we should send an update to our database. I'm struggling ...
1
vote
1answer
49 views
Diode lights generate false interruptions
I have spent quite a considerable time debugging my code that was triggering false interruptions. I have found out that the source of the error were the diode lights (on the picture). I would like to ...
1
vote
1answer
43 views
ISR not working as it is supposed to
For a battery charging project, i am using an ARDUINO UNO which is driving a buck converter to provide the battery with the charging current. I am using external ADCs to measure the battery's charging ...
0
votes
1answer
26 views
Using a library of sleeping with a combination of the WD and a physical INTERRUPT
I would like to use one of the nice libraries like :
JEELIB
ENERLIB
SLEEP_N0M1
NARCOLEPTIC
ADAFRUITSLEEPY_DOG
LOW_POWER_MASTER
But to use a X second interval of sleeping and in the same ...
1
vote
1answer
61 views
Timer interrupt won't work if the ISR is not set
I am using an Arduino Mega 2560.
I have a code in a c file, that looks like this:
#include <avr/io.h> /* for DDRB, PORTB, etc. */
#include <util/delay.h> /* for ...
0
votes
2answers
49 views
C++ Namespace/scope problem when trying to attach arduino interrupt
I have defined a c++ class (RpmDriver) and want to use attachInterrupt in the constructor to link an Arduino pin to its ISR (RpmInt) in the class. When I try this, I get:
error: cannot convert ...
1
vote
1answer
57 views
Debouncing a limit switch in Arduino ISR with delays
I have a limit switch attached to an arduino Mega 2650 for motion control. The limit switch's two Normally Open contacts are connected to an Arduino Pin and ground, such that when the Limit Switch is ...
2
votes
2answers
87 views
Trouble with sleep mode and interrupts
Context
I am building a small battery powered counting device. As with many other projects like this, saving power is critical. I am therefore trying to utilise the sleep mode wherever possible. This ...
0
votes
1answer
33 views
Issue with leOS2 for one-time tasks
I'm trying to use the last version of leOS2 scheduler from Leonardo Miliani ( https://github.com/leomil72/leOS2 ) but I have a strange behavior with a very simplistic ONETIME task.
Platform : Arduino ...
2
votes
1answer
65 views
Servos and ultrasonic at the same time
So recently I started making a sonar out of ultrasonic HC-SR04 sensor and servo motor. The idea was to slowly rotate servo 180 degrees while measuring distance.
Soon after I noticed that regular ...
1
vote
2answers
51 views
Why PJ0 and PJ1 are not reporting as PCINT pins
When the sketch shown at end-of-question is compiled and uploaded to an Arduino board, it is supposed to Serial-print a list of available digital pins, showing for each pin whether it supports PWM or ...
2
votes
1answer
172 views
Atmega168 Watchdog timer
I'm trying to use the watchdog timer to prevent the atmel from being stuck in a loop.
Right now, I have the watchdog timer in System Reset Mode, with a 8sec timer. I reset the timer in every loop ...
1
vote
2answers
79 views
Not waking up more than once?
I'm trying the following code on an Uno. I'm pulling the high side of a pull down 10K resistor to 5V, but it can only be woken once. Just once. Does anyone know why this might be the case?
It works ...
0
votes
1answer
45 views
Usage of SPI inside an ISR
I learned, that SPI-code uses interrupts. So is it true then, that I can't use SPI related code inside an ISR?
Background: I want to capture one or more revolution speeds with an MCP23S17. I rewired ...
0
votes
3answers
124 views
counting pulses from encoder on interrupt 0 pin every 50 ms
I want to calculate the number of pulses coming from motor1 encoder pin2 (Int0) as input , and motor 2 encoder pin3 (Int1), I am working now for the first motor (just for the first motor ) so I set ...
1
vote
1answer
113 views
Timer 2 interrupt with ATmega328p and make measurement in ISR
I am working in my project and i want to use Timer2 interrupt every 100ms to get new measurement from the output of my 5 sensors which connected to pins A1,A2,A3,A4,A5.
I read in some article that ...
0
votes
3answers
58 views
What's the benefits between different interrupts on Arduino
On an Arduino you can have several different interrupt types, two of them being RISING and FALLING. Looking past that RISING is from LOW to HIGH, and FALLING is the opposite, what are the benefits of ...
0
votes
2answers
103 views
MPU9150 (JEFF LIB) + FIFO_OVERFLOW INTERRUPT + SERIAL PRINT
Overflow enthusiasts!
I am trying to log accelerometer and gyro data using Serial.print. I have enabled the FIFO_Overflow interrupt. Whenever I log data, the serial port freezes. I am suspecting an ...
0
votes
1answer
51 views
Interrupt variable not getting called while executing another part
volatile byte _incomingFlag = 0;
void onIncoming () {
_incomingFlag = 1;
Serial.println(F("You got an interrupt"));
mySerial.println("ATH0");
}
void setup () {
/* First Start the ...
0
votes
2answers
97 views
Count RISING edges of a wave form by using ARDUINO
I have realised an electrical circuit that gives 5V in output. When I press a button, it gives 0V.
So I have in output a square wave (5V - 0V).
I would like to count how many times I press the button, ...
0
votes
1answer
68 views
UNO Timer 1 CTC mode not resetting TCNT1
I'm trying to set up timer 1 to run an isr in CTC mode. no matter what i set OCR1A to it always executes at the same frequency and if i print out TCNT1 I get values higher than OCR1A.
here is my Code
...
0
votes
1answer
92 views
Password code using interrupts and timers on Arduino Uno
I have a group project where we are trying to make a user enter a password that we have pre-selected for them. They enter the password using tactile buttons, and they have 5 tries to enter the ...
0
votes
4answers
187 views
Interrupt fires multiple times
I have a Photo Interrupter which I am using to count the RPM of a motor.
I am incrementing an integer to show the amount of interrupts there have been.
The issue is that there can be several ...
-1
votes
2answers
77 views
coding problems
I'm working on a Arduino controlled solenoid motor project that I found on Instructables. I have been able to piece together what I think is most of the code but I'm getting some syntax errors and was ...
1
vote
1answer
100 views
Attiny45 wake by Software Serial
I would like to wake Attiny45 from sleep by Serial communication. RX is connected to pin 7 (D2). When I try to use PCINT0_vect routine, I get an error "multiple definition of `__vector_2'" so it looks ...
3
votes
4answers
337 views
Running multiple tasks at once
For a school project we're working on a wearable device to track people's movement and heart rate. We use an Arduino Pro Mini with a heartbeat sensor and an accelerometer. The wearable device uses ...
0
votes
1answer
31 views
IDE to program Arduino Uno especially internal interrupt vectors
I am trying to program this Arduino Uno's Timer1 module to use its Input Capture pin to record the times of edges and store / transmit them during the Input Capture Interupt Service Routine, but I ...
0
votes
2answers
195 views
Where is documentation on Arduino's Internal Interrupts?
First time arduino programmer here...however I have programmed the TI MSP430 in the past...
I am trying to figure out how to configure internal Interrupt Vectors on this Arduino Uno.
In the Arduino ...
0
votes
4answers
397 views
Arduino DUE Interrupt 1MHz
My Due is interfaces with a DAC which I need to update with freq 1MHz. The nice solution seems to be a timer interrupt. I found a thread here called "Arduino Due - creating an 8Mhz clock signal". I ...
0
votes
4answers
897 views
How to read data from a rotary encoder with ATmega328
I'm using a home made "bare bones" Arduino, made with the ATmega328, and I need to read angle data from a geared DC drill motor, turning at speeds between 0 and 450 RPM. This is so I can use it as ...
1
vote
1answer
117 views
Adafruit CC3000 Wifi Shield on IRQ 2?
I'm using an AdaFruit CC3000 Wifi shield as an HTTP server with an Arduino Uno.
I have a script which works fine -- logs into my Wifi and listens for connections as it should.
However, I want to ...
0
votes
1answer
178 views
AVR Timer1 OCR1A controls TIMER1_COMPB_vect interrupt!
I was struggling with timer interrupts in my project. I couldn't make it work properly. So I decided writing a simple code and I saw a very interesting case.
ISR(TIMER1_COMPB_vect)
{
PORTB ^= ...
1
vote
1answer
55 views
Making a composite waveform using a single TIMER interrupt
I'm writing software for a laser tag gun, which under the system we use needs the output waveform to be a carrier wave of 57600Hz with a signal wave of 1800HZ for about 50ms
Using the Tone library ...
0
votes
2answers
140 views
Multiple interrupt lines connection
in my project need to connect more then 10 I2C sensors(MPU 6050) to Arduino Mega and each sensor an interrupt line is essential.
Since in Arduino it only got several interrupt slot(digital 2, 3, ...
1
vote
2answers
167 views
Arduino Watchdog Timer
I want to work with interrupts and heard that the watchdog timer is effective way to deal with them. I haven't been able to find a good tutorial on them though and was wondering if someone could head ...
1
vote
2answers
71 views
Intterupts For Arduino
I am making a moving robot that will be autonomous in many respects. However if something goes wrong I want to be able to use a remote to push a button and it stop in its tracks no matter what ...
1
vote
2answers
582 views
IR Receiver interrupt and arduino sleep mode
I need to put my arduino into the sleep mode in order to consume less power. My arduino receives IR data and do some work with it, but I need to make it sleep until there is no data. If the data has ...
1
vote
1answer
118 views
Tone inside interrupt
I am trying to play a tone with a buzzer connected on an arduino nano pin. I have also connected a reed switch with INPUT_PULLUP on INT0 and a led. The program loops continuously (it's an ...
-1
votes
1answer
38 views
interrupt and/or other ressources used by Time functions micros() and delayMicroseconds()
I want to use Arduino Uno (Rev. 3) resp. Arduino Nano for time critical ignition control of a combustion engine. Software is developed under arduino rev. 1.6.2.
The only Arduino system functions i ...
0
votes
0answers
10 views
Maximum delay time for a switch read loop [duplicate]
I have this simple program:
void loop() {
sendInputs();
delay(10);
}
the sendInput() method reads some digital inputs connected to an external switch and sends a command via serial port.
My ...
