Pin Change Interrupts debounce
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@alexsh1 how about adding global variables for all interrups like this
volatile unsigned long lastInterruptD1 = 0; volatile unsigned long lastInterruptD2 = 0; ...and inside the ISRs set the corresponding variable to millis() like this
lastInterruptD1 = millis();and in loop have a series of
if(lastInterruptD1 != 0 && millis()-lastInterruptD1 > DEBOUNCE_MS){ lastInterruptD1 = 0; // Do whatever the interrupt does here }You could use an array instead of individual variables to make the code cleaner, especially if you want to cover a lot of pins. Which board/Arduino are you using?
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@mfalkvidd it is a custom made board using atmega328p-au with sensebender bootloader running at 8Mhz and 3.3V.
I'll try the above, however, does millis() work while sleeping? -
@alexsh1 it will return the last value, but it will not increment. That's one of the reasons ISRs should exit quickly.
@mfalkvidd
Want to share what I found in case others have a similar issue.const unsigned long debounceTime = 50; volatile bool ir_selector_pressed = false; ISR (PCINT2_vect) { // handle pin change interrupt for D0 to D7 here static unsigned long previousStateChangeMillis = 0; static bool previousPinState = HIGH; bool pinState = digitalRead(SELECTOR_BTN); if (pinState != previousPinState) { // ignore pin changes of pins other than SELECTOR_BTN if (pinState == LOW) { // only falling events if ((millis() - previousStateChangeMillis) > debounceTime) { // debounce ir_selector_pressed = true; } } previousPinState = pinState; previousStateChangeMillis = millis(); } }``` -
Another way to debounce is to stop interrupts in loop, sleep for say 20 seconds and then resume interrupts.
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@alexsh1 this is in general a bad idea, as it will also stop eg reception of serial data and incoming packages (when using message queuing).
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@alexsh1 The easiest way would probably use a debounce-library.
These normally aren't using interrupts, but you have to question yourself if you really need interrupts in your case.I don't have any readymade, tested code which uses interrupts and debounces switches.
http://yveaux.blogspot.nl
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@alexsh1 The easiest way would probably use a debounce-library.
These normally aren't using interrupts, but you have to question yourself if you really need interrupts in your case.I don't have any readymade, tested code which uses interrupts and debounces switches.
