Comments (4)
MCUdude
commented on August 19, 2024
It is indeed connected to the VIN pin, However, since microUPDI requires a 5V 16 MHz Pro Mini, this means that the solder jumper (SJ1 in the Pro Micro schematics is shorted, and ~4.5V will appear on the VIN pin.
I chose that connection point because it's the closest to the AREF capacitor. However, you may choose any 5V point on the board if you like.
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hiduino
commented on August 19, 2024
Yes, thanks for the clarification. I think it will be safer to go with the 5V output, just in case someone decides to put in more than 5.5V on the raw input (not that anyone would but you never know).
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MCUdude
commented on August 19, 2024
I think it will be safer to go with the 5V output, just in case someone decides to put in more than 5.5V on the raw input (not that anyone would but you never know).
There's no reason to connect the Raw pin to anything when using the Pro Micro as a UPDI programmer. I'll leave a note that the Raw pin shouldn't be used.
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MCUdude
commented on August 19, 2024
The latest release (v1.0.1) uses a modified firmware where the hardware modification is no longer necessary since AREF is connected to VCC internally instead
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