Using UNO-SMD Edition for Uploading to Mini-Pro

Development Tools IDE 1.x
1

Hello,

is it possible to use the UNO-SMD Edition (i.e. without removing the ATMEGA) für uploading a sketch to a Mini-Pro with already installed bootloader. In fact not the procedure using an Arduino as an ISP programmer but just use it as a "replacement" USB to TTL adapter... How to prevent the UNOs Atmega from beeing reprogramed?

Thank You,

Christian

2

Jumper the Reset pin to Ground. That should put the processor in a safe state and allow the USB-to-Serial part to be used for other things.

If that fails, try loading the following sketch instead:

void setup() { Serial.end(); pinMode(0, INPUT); pinMode(1, INPUT); }
void loop() {}

You will probably need to disable auto-reset after uploading the sketch. A 1 to 10 mFd capacitor between Reset (+) and Ground (-) should do it.

3

Hello,

thank You for Your help, holding the UNOs Atmega in permanent reset with a jumper does the Job :slight_smile:

Christian