I have two open-collector outputs, one from a PS2 keyboard and one from a DS3231 Real Time Clock. I am, successfully, throwing an arduino ATMEGA1884p into sleep mode with a set_sleep_mode(SLEEP_MODE_PWR_DOWN); However, I would like to raise it out of sleep mode by, either, pressing on the Ps-2 key…

Open collector or drain outputs are designed for the possibility of wired-OR logic. Just connect them together, with a pullup resistor and connect to an INT pin. Connect all the grounds, of course.

Why do you want to use an interrupt, if you have to check in code which device triggered the interrupt? You need at least as many inputs as you have interrupt sources. If ever, I'd use a PCINT (Pin Change), where up to 8 interrupts can be watched in one ISR, and the interrupt source(s) can be deter…

You better should try to understand how electronic circuits work, instead of playing with arbitrary solutions for not understood problems..

Investigate reply #1 carefully. You don't need any hardware beyond a pullup resistor for this.

Hi, Truth Table, two NPN open collector. [Transistor N-OR Gate.jpg] Tom.. :slight_smile: [Transistor N-OR Gate.jpg]

DrDiettrich: Why do you want to use an interrupt, if you have to check in code which device triggered the interrupt? You need at least as many inputs as you have interrupt sources. If ever, I'd use a PCINT (Pin Change), where up to 8 interrupts can be watched in one ISR, and the interrupt source(…

Connecting two open-collector INT outputs to one Interrupt

Projects General Guidance

TomGeorge November 10, 2017, 2:04am 6

Hi,
Truth Table, two NPN open collector.

Tom..

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Connecting two open-collector INT outputs to one Interrupt

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