![]() ![]() delay () does not work in an ISR, because it relies on the millis () counter to increment. In a previous tutorial, we looked at Arduino external interrupt where the interrupt was caused by is caused. That will block any other things from happening, for example Serial communication (which is done by interrupts in the background). Hardware or external interrupt and Timer interrupt. I need it to change the lights at whatever point in the cycle the button is pushed but am having trouble finding out how to make it work. An interrupt service routine (ISR) should not do any things, that take long. ![]() The LED will remain low for 8.799 ms, then turn on for 100 ns, followed by an additional 100 ns delay. By utilizing interrupts, I aim to make the LED output go low when the falling edge of the chopper signal is detected. Task 4: Power on LED 4 if the potentiometer value is greater than 512. Task 3: Power on LED 3 if the push button is pressed. Please see Nick Gammons comment below on clearInterrupt (), i.e. I'm having trouble getting it to end the loop and function that is running at the time though. Hello everyone, I'm currently working on a project where my goal is to send a reference signal from an optical chopper to an Arduino, specifically to be received on pin 2. Task 2: Read user input from Serial (number between 0 and 255) and write the data to LED 2. The interrupt service routine (ISR), test (), is really short and does not call functions that actually need interrupts to work (e.g. I'm writing a traffic light program, and am trying to incorporate a push button that when pushed will turn the upper lights red and the lower ones green (see diagram). ![]()
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