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Just to be sure, RX and TX on Uno board are digital pins 1 and 2, right ? But that would mean, that if I wanted to upload sketch to finished project which would have soldered all the digital pins to other modules, I couldn't use those 2 pins (RX,TX). That was the reason why I wanted to use ISP so I wouldn't have to sacrifice 2 pins.

Frodik
– Frodik

2014-08-26 04:25:05 +00:00
Commented Aug 26, 2014 at 4:25
@Frodik - ISP requires 3 pins plus reset, bootloader requires 2 plus reset. That doesn't mean you have to reserve the pins, but it does mean you can't use them for things which conflict. For example, you can use them as outputs from the ATmega to peripherals, as long as spurious operation of the peripherals during programming is not problematic. But you shouldn't use them to read from peripherals which might problematically drive signals onto those pins during the programming.

Chris Stratton
– Chris Stratton

2014-08-26 15:53:12 +00:00
Commented Aug 26, 2014 at 15:53
@ChrisStratton But if I understand it correctly, ISP requires different pins than digital 1-13, right ?

Frodik
– Frodik

2014-08-26 16:29:11 +00:00
Commented Aug 26, 2014 at 16:29
@Frodik As Chris mentioned, 3 pins are used, these pins are D11, D12, D13. The arduino website shows this arduino.cc/en/Tutorial/ArduinoISP. Remember that a Pro Mini is literally an Uno that got shrunk.

Doowybbob
– Doowybbob

2014-08-26 20:22:13 +00:00
Commented Aug 26, 2014 at 20:22

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