Is there a schematic for the Heltec Automation ESP32 with OLED and Li-Ion charger?
Posted: Tue Jul 17, 2018 5:07 am
I want to charge it with a solar panel and wonder if I can just connect it to the USB 5V with a diode to prevent battery discharge and if the Li-Ion battery will charge properly and the circuits won't get damaged with the 5W solar panel which can put out 7V on open circuit. The LoLin ESP8266 schematics were not accurate for my circuit and I noticed a heavy drain on the battery when I used them with a 3.3V regulator. I.e., the USB 5V circuit seemed to create a heavy load to the 3.3V applied to the module unless I biased it, which defeated the purpose of running off of batteries. The ESP32 schematics I've found do not seem to cover my HTIT-WB32 Heltec Automation module with the OLED display and Li-Ion plug on the bottom of the PCB.