Hi, I have modified our bread machine to run from a Nano and a couple of SSRs and powered internally from a 12vdc buck. I have a USB cable poking out so I can update as needed.
It is all good but overnight there are some power glitches (joys of country living) and the program sometimes gets scrambled.
I have been plugging in a power-brick to the USB and that seems to maintain the program, but overnight in "waiting" mode, the current draw drops below 200mA required to keep the brick alive.
I tried a small USB book reading lamp plugged in as well but it draws too much current and flattens the brick before morning.
What can I use (off the shelf item) for a 250mA or so load? The USB dummy-loads I have found so far have all been around 1-A and higher mark.