Hi, everyone! I'm working on a two-pronged Bluetooth project: The first goal is to get the code working on an Arduino Uno; the second goal is to port the code to an Arduino Pro Mini 8MHz 3V3. I have two questions:
To program the Pro Mini, I need an FTDI programmer. This mates to the 6 pin board header. Power goes IN through Vcc. When programming is done, I want connect a Bluetooth Mate to the 6 pin board header. In this configuration, does power flow OUT through Vcc into the Bluetooth module, assuming I have supplied power to Arduino's other Vcc or RAW pin?
To power a 3V3 device, can I drive one pin HIGH to act as Vcc and one pin LOW to act as GND? I understand that this will only supply 40mA of current.