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Using the PWM method how; could you explain? Your idea of using a counter and resetting it on a timer would be completely asynchronous to the acquisition chip A/D; that's not going to work. I need to synchronize on the interrupt pulse and don't see how Espruino can be used in this way as a 'pulse stretcher' without additional hardware.
billsalt
@allObjects
222Hz is much better... because I know that an empty loop in Eskpruino a a few KHz at max. Said such, you can use another pin on your device and create the input signal with a PWM as mentioned before. With not too much capacity in the sense wiring and good contacts, I'm sure you can get reliable results. With 222Hz, you have about 4ms to spend between each of the pulses.