120ThingsIn20Years
Senior Member
If I'm making a run of devices*, and none of the people that will have the devices will be re-programming the chip, I figure I can just program the chips on my prototype, then leave out the plug on the other devices.
The question is, how do I tie down the serial-in pin when there's no plug?
pin -> 22k resistor ->10k resistor -> ground?
Or do I just need the 10k resistor?
Also, I have a few salvaged caps and was wondering what the criteria is for the cap that goes between the + and - to the chip that I think is there to stop power spikes.
*(just a simple overheating alarm with only a few lines of code, a thermistor, and a pizo speaker)
The question is, how do I tie down the serial-in pin when there's no plug?
pin -> 22k resistor ->10k resistor -> ground?
Or do I just need the 10k resistor?
Also, I have a few salvaged caps and was wondering what the criteria is for the cap that goes between the + and - to the chip that I think is there to stop power spikes.
*(just a simple overheating alarm with only a few lines of code, a thermistor, and a pizo speaker)