- Wed Jan 06, 2021 6:48 am
#222111
I would like to do some "quite low power" prototyping and hand-made small production for a project. This means that I would like to:
- have access to all my usual pins as a development board
- have no power or other LED that is on by default (user-controlled LEDs for debugging / playing around are fine and even desired)
- be able to power from USB / jack during development if I want, which implies having a power regulator and possibly polarity inversion protection on board, but also being able to bypass them altogether (i.e. the usual 3.3V rail, this is already well available)
- be able to both use USB for programming when a USB cable is plugged in, but bypass altogether and do not power the USB interface chip when there is no USB cable
- generally, have a board that, when not plugged in a USB or jack for power, minimizes power wastes
My questions are:
- is such a board available (I don't think so, can you confirm?)
- how far is the RedBoard from fulfilling these requirements? In particular, if I desolder the power LED, and if I feed 3.3V directly through the 3.3V pin:
-- can you confirm that the power regulator is bypassed altogether (I would guess so)
-- is the USB interface chip also bypassed / powered down altogether, or are there some power losses there?
-- any other sources of losses I should be aware of?
- have access to all my usual pins as a development board
- have no power or other LED that is on by default (user-controlled LEDs for debugging / playing around are fine and even desired)
- be able to power from USB / jack during development if I want, which implies having a power regulator and possibly polarity inversion protection on board, but also being able to bypass them altogether (i.e. the usual 3.3V rail, this is already well available)
- be able to both use USB for programming when a USB cable is plugged in, but bypass altogether and do not power the USB interface chip when there is no USB cable
- generally, have a board that, when not plugged in a USB or jack for power, minimizes power wastes
My questions are:
- is such a board available (I don't think so, can you confirm?)
- how far is the RedBoard from fulfilling these requirements? In particular, if I desolder the power LED, and if I feed 3.3V directly through the 3.3V pin:
-- can you confirm that the power regulator is bypassed altogether (I would guess so)
-- is the USB interface chip also bypassed / powered down altogether, or are there some power losses there?
-- any other sources of losses I should be aware of?