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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Can a function be called automatically when an input changes?
Currently, my sketch is checking an input pin every time round the main loop. If it detects a change, it calls a custom function to respond to it. Here's the code (trimmed down to the essentials):
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How many interrupt pins can an Uno handle?
I am looking at using a 7 channel RC receiver with the Arduino Uno R3. In the documentation, there are mentions of a maximum of 2 interrupt pins, whereas on certain other blogs I have seen mentions of ...
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How do interrupts work on the Arduino Uno and similar boards?
Please explain how interrupts work on the Arduino Uno and related boards using the ATmega328P processor. Boards such as the:
Uno
Mini
Nano
Pro Mini
Lilypad
In particular please discuss:
What to use ...
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How precise can I get Arduino using rotary encoders?
Stepper motors are often pricey for a large motor. However, with a powerful, standard DC motor and a rotary encoder, you can "simulate" a stepper motor. How accurate are rotary encoders with Arduino ...
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Using millis() and micros() inside an interrupt routine
The documentation for attachInterrupt() says:
... millis() relies on interrupts to count, so it will never increment inside an ISR. Since delay() requires interrupts to work, it will not work if ...
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Are function pointer assignments atomic in Arduino?
The following snippets are from TimerOne library source code:
// TimerOne.h:
void (*isrCallback)();
// TimerOne.cpp:
ISR(TIMER1_OVF_vect) // interrupt service routine that wraps a user defined ...
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Counting pulses with interrupt
I have been trying to count pulses from a 12,500 Hz square wave to trigger an output. Here's the code I have so far. When the Arduino is reset it prints 315 to the serial over a 25 ms sample....
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Why the need to use the volatile keyword on global variables when handling interrupts in Arduino?
I am familiar with the keyword Volatile being used to declare variables that are shared among multiple threads on a software application (basically on a multithreaded application).
But why do I need ...
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Multiple independent LED patterns
I have an problem, which at first thoughts (and being new to Arduino) I though was a perfect application for an Arduino. However, after trying and failing to implement it I am doubting myself!
Simply ...
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Is volatile needed when variable is accessed from > 1 ISRs, but not shared outside ISRs?
It's clearly documented that when global data is shared with an ISR and the main program, the data needs to be declared volatile in order to guarantee memory visibility (and that only suffices for 1-...
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How to generate hardware interrupt in mpu6050 to wakeup arduino from SLEEP_MODE_PWR_DOWN mode?
I am using Arduino UNO and has kept in SLEEP_MODE_PWR_DOWN mode & want it to wakeup using MPU6050 hardware INT pin (which should send a signal when MPU is in motion). I have used the article https:...
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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 ...
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When setting hardware timers as interrupts, should I prefer a lower prescaler value or a lower CTC?
I'm currently playing with Arduino's hardware timers, and a question came to my mind. Let me explain it a bit.
Let's suppose I want a certain function to execute every 1024 clock ticks. AFAIK, I ...
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Mic input and Speaker output using arduino
I am trying to make a small project. Firstly, I want to record voice using a small microphone(electret) for the time button is pressed and on releasing the button, the speaker of my laptop should ...
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Why is that any sensor signal need to be hooked up to the interrupt pins on Andruino boards?
I have come across some Andruino Sensors like Motion, Light and all recommend to be connected to pin 2 or 3 on Andruino Uno board which are interrupt pins. This is especially true if you are looking ...
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