I'm using a 12V DC 2A power source to power a 12V LED strip, and controlling it using a WEMOS mini and a relay.
Yes, I know there is a power shield for WEMOS, but I tried to regulate the 12v input to power the WEMOS as well, which did not succeed.
First I tried with a 3.3V Zener diode via 3.3V pin on WEMOS- with no success.
Later I tried with a 5.1V Zener diode, and 5V pin on WEMOS - and again no succees.
- See schematic (please ignore diode's catalog number.) Circuit yields voltages as expected.
- Measuring current, using a multi-meter, shows a draw of only 10mA, when I guess a 200mA is needed at start.
- Since it is a 1W diode, at least P=VI should yield a nominal of 200mA when using a 5V diode.