The project I’m working on needs to be powered solely by external power source (e.g. USB power bank and/or batteries) since it will be situated in remote areas. For this occasion, I’ve bought 3.7V 450mAh Li-ion battery and 3 x AAA battery holder, both with 2-pin JST connector as required by the MKR1000.
The polarity of JST connector on Li-ion battery & battery holder is correct but it doesn’t make any difference. Arduino will only work on USB power and appears dead when switched to external power source.
What am I doing wrong? Nevertheless, the inside of the GND pin on the MKR1000 JST pin
Any advice is appreciated, thanks!