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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Robin
Mon 2017.08.28
@user80719,
Using this diagram http://www.espruino.com/Pico#otherpins
and plugging in the USB cable:
1) What is the voltage between pin 1 GND and pin 2 VBAT
2) What is the voltage between pin 1 GND and pin 3 3.3
Remove the USB cable:
Place your 9v power in on pin 18 BAT_IN and perform the same test as above:
3) pin 1 GND and pin 2 VBAT
4) pin 1 GND and pin 3 3.3
Schematic at:
http://www.espruino.com/Pico#-a-name-power-a-power-and-the-fet-b0-jumper