erco
Senior Member
I need to squeeze one more input for my 08M2 project, so I want to use the serial input programming pin (C.5) to attach a microswitch for occasional use. According to manual 2, the internal pullup resistors are only available for C.0 to C.4 so I'll need to add an external resistor. My previous attempt to use an IR receiver on that same pin interfered with programming the chip. That receiver was connected directly to the pin. I should have tried adding a switch to disconnect it from the pin for programming. Next time.
It seems like adding a digital switch should be possible and should not require a disconnect switch if done properly. My question for the experts: is it better to use a pullup or pulldown resistor, and what value, ~100K?
It seems like adding a digital switch should be possible and should not require a disconnect switch if done properly. My question for the experts: is it better to use a pullup or pulldown resistor, and what value, ~100K?