Interrupts allow the processor to suspend normal operation temporarily so that a high-priority software or hardware event can be handled instead.
2
votes
1answer
74 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
31 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
29 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
46 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 ...
0
votes
1answer
46 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
34 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
54 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
40 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
40 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
37 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
53 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
88 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
65 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
50 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
166 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
27 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
98 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
129 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
467 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
81 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
66 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
48 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
102 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
121 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
61 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
230 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
79 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
35 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 ...
1
vote
1answer
224 views
Multiple interrupts in same sketch
I am trying to create an Arduino program that combines a pulse sensor (that measures the Beats Per Minutes) and a music shield. I am experiencing some difficulties with the coding because the pulse ...
1
vote
2answers
173 views
Why is my interrupt code not working?
Background
I'm trying to write code to read signals from a six-channel RC receiver on an Arduino Mega 2560. Currently I am keeping the code to just read one channel to make things easy to ...
0
votes
1answer
113 views
Is PulseIn fast enough for Quadcopter?
I've been trying to use interrupts to control a quadrotor with a tx/rx to no success. I'm using an arduino mega as my control board. I have successfully read a singe channel using attach interrupt and ...
0
votes
2answers
630 views
Reading I2C sensors with a timer interrupt
I would like to read a sensor connected via I2C using Timer3 and Arduino Mega. Values are read from the sensor in the interrupt service routine and timer3 is set to trigger an interrupt at 200Hz.
...
1
vote
3answers
287 views
What happens if an interrupt is triggered while sending data via serial?
I would like to use an inertial sensor to measure acceleration and send the results to an Android app using a serial communication with a bluetooth Mate Gold module. The sensor provides a data ready ...
0
votes
1answer
180 views
What could cause interrupts from MCP23017 suddenly stop working?
I have 4 rotary encoders connected to an MCP23017 which in turn is connected to interrupt port 0 on the arduino (and to I2C of course). Everything works fine: I get interrupts for all 4 rotary ...
0
votes
0answers
113 views
ADXL345 Arduino UNO Activity Inactivity interrupt
I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
1
vote
0answers
117 views
ADXL345 Arduino UNO data_ready interrupt
I would like the sensor values to be updated each 10ms(100Hz) and then run the algorithm and repeat the same process. However, after timing the algorithm it is taking only 2ms, I think the data_ready ...
1
vote
3answers
163 views
ISR executes even though an interrupt is not triggered
I am trying to implement a function queue scheduling system. INT1 is connected to a button and int1task causes an LED to flash.
typedef void (*funcptr)(void);
TPrioQueue *queue = NULL;
void ...
0
votes
1answer
3k views
arduino program got error expected //primary-expression before ')' token error: //expected ';' before '}' token E
#include "pulse-sensor-arduino.h"
#include "Arduino.h"
#define PulseSensorbegin
int pulsePin = 0;
int blinkPin = 13;
int fadePin = 5;
int fadeRate = ...
2
votes
1answer
123 views
Unstable system when controlling power to serial peripheral devices and sleeping
In the process of trying to make a small system that will last a while on 4 AA batteries, I've reduced my Arduino project to a barebones system that when asleep draws a tiny amount of current from the ...
1
vote
1answer
195 views
Power consumption issue. I made project using atmel-328p
I made project using atmel-328p. I want to run it over a year. I am using power_down mode & 5500 mAh li-ion battery still battery discharges in 1 day. I am using standard code as explain on ...
1
vote
1answer
212 views
Problem with while loops while detecting frequency of a signal
I just started to use the unusual part of Arduino language (avr) like interrupts, accessing registers, etc in Arduino IDE. I wrote a program to calculate the frequency of a digital signal using ...
1
vote
1answer
177 views
Multiple Definition of “_Vectors”?
I'm working on an arduino project that uses the GSM Shield and the eHealthSensor from Cooking Hacks. However I ran into an issue in which the interrupt vectors from the header/cpp files used are being ...
0
votes
1answer
103 views
TIMER1 CTC Interrupts not working with avr-gcc
I am attempting to program my arduino in plain C, and I've come across some very strange behavior. If I load the following code from the Arduino IDE, it works as expected and toggles Pin 6 every ...
1
vote
1answer
108 views
Serial interrupts?
In a project, I’m using an EIA485 bus to send encrypted data packets. That works with Arduino’s buffered serial, but it is kind of awkward, and I’m using none of the more complex stuff in that class ...
1
vote
2answers
325 views
How to attach interrupts to Arduino UNO timers?
I understand there are 3 timers on the Arduino UNO. What specific registers do I need to use to access them?
My goal is to use these timers to poll different sensors I am using with a ms period. Are ...
0
votes
1answer
81 views
Interrupts don't work
I tried to run a sketch that tests my AVR's interrupts,
I have an UNoriginal Arduino Uno, and I've checked pins 2 and 3 like the following:
- at void setup()
attachInterrupt(2, inter, CHANGE);
- at ...
1
vote
1answer
494 views
Using multiple timers and avoiding conflicts
I would like to use three timers in CTC mode to launch three Interrupt Service Routines at different frequencies.
In this application I need to use the servo library, millis() and micros() ...
4
votes
2answers
286 views
How to update a variable in an ISR using Timers
I'm trying to check the frequency of Timer3 using a counter. The value of the counter, declared as volatile, is incremented in the ISR and every second the sum is shown in the main loop and the value ...
1
vote
1answer
198 views
Interrupts in analog inputs
I have an Arduino UNO. I've been reading about Pin Change Interrupts, and one vector covers the Analog Pins. However, is it possible to trigger interrupts using analog pins as analog inputs (not ...
