Backwards counter

ESPHome
1

Good evening everyone.

I configured an esp so I can read the number of pulses (contact to ground) and convert them into meters (1 pulse = 0.3m).
My problem is when a specific gpio is high, in fact from that moment the counter must count backwards.

any ideas on how to implement this part?

thanks for any suggestions

Costa

2

Without any code, I’ll just talk through my thought.

Assuming the contact to ground just adds .3 to something, put a check in before the add that is basically if specific gpio is high, make value -0.3, else make it 0.3.

Then, add value to something.

You can also set value to 0.3 above and if specific gpio is high, make value = value * -1. The advantage to this is if you decide to change 0.3 to something else, you only have to change it in one place and not forget the second one.