[newbie] What is that plug on the TTGO?

[Winfried]

Hello,

I don't know much about embedded, and this is the first time I'll be using an ESP-based micro-controller (to build a DIY CO2 box).

I just bought this TTGO and intend to connect it to a Senseair CO2 sensor.

What is this plug for?

(I guess RST stands for Reset, ie. reboot the controller; In addition, there are two programmable buttons named GPIO 0 and 35.)

Thank you.

TTGO.png (1.16 MiB) Viewed 2056 times

[ESP_Sprite]

Most likely you can connect a LiIon battery there, to allow the board to run without an external power supply. (P2 in the board schematics)