search

LilyGO / ESP32-TTGO-T1

This is a self-developed version of ESP32 equipped with CP2102 serial chip, Bluetooth V4.2 and WiFi.
16 stars 6 forks source link

What does the switch do? #3

Open Alacritous opened 5 years ago

Alacritous commented 5 years ago

I bought two TTGO T1's from aliexpress. I'm happy with the device so far. there's nothing wrong with it. I just can't figure out what the switch on it does. There's no documentation and a Google search doesn't turn up anything. So anyone out there know what it does?

DavidStacer commented 4 years ago

If you have a battery connected, it will switch the power from the battery on or off from supplying power to the board.

BogusException commented 3 years ago

There is no difference in either position as for charging. The board charges the battery with USB/Vin regardless. The Blue LED is from the charger, meaning there is external power. It lights on external regardless of position. When external removed, the red LED will light only if a) the attached battery has enough juice, and b) if the switch is in the 'on' position.

I can't see the logic right now of not always powering on internal power when external is gone. If you don't like that, simply don't plug in a battery. Now which kinds/voltages battery can be charged... that would be useful.