I recently got an ESP32-01 Breakout and Development Board from EzSBC.com. It is advertised as a board specifically designed for use with batteries because of it's low current draw when in sleep.
As a test I loaded the basic Arduino
blink sketch onto the board using pin 19 as the built in test LED. When I power the board from the computer through the USB connection the LED blinks as expected, but when I connect a battery accross VIN -> GND nothing happens.
What am I doing wrong?