- Wed Jan 08, 2014 8:14 pm
#167115
I suspect a painfully simple question, but I cannot find a clear answer here. My new Pro Micro 3.3V is working great- my question now is, can I supply another power source, which is handling my higher current devices, to the RAW pin, while at the same time continuing to program and run the board with the USB plugged in? What if the RAW power is 5V instead of 3.3? (It's not in this case, but that could change.) I do also understand that if I am sure that my power source is clean and close to 3.3V that I can connect it directly to VCC instead.
The schematic makes it clear how RAW routes through the regulator where it comes out as VCC, which is the same VCC as is connected to the USB port, so it would seem that this just creates two parallel 3.3V sources whenever power is on the RAW pin and USB is plugged in. I just want to be sure before I connect it this way. So far I have been testing the code on USB power, then unplugging USB and connecting power separately. I do know that on all the other BASIC Stamps, Picaxe boards and such that I have worked with, they could be programmed through USB while external power was connected. I am assuming this to be the case here, but this is my first Arduino so I want to be sure.
Rob
The schematic makes it clear how RAW routes through the regulator where it comes out as VCC, which is the same VCC as is connected to the USB port, so it would seem that this just creates two parallel 3.3V sources whenever power is on the RAW pin and USB is plugged in. I just want to be sure before I connect it this way. So far I have been testing the code on USB power, then unplugging USB and connecting power separately. I do know that on all the other BASIC Stamps, Picaxe boards and such that I have worked with, they could be programmed through USB while external power was connected. I am assuming this to be the case here, but this is my first Arduino so I want to be sure.
Rob