Heltec LoRa 32 V2.1 Battery voltage reading

[costo]

yep, pin 37 is used for battery monitor.

Look in this post for solving the battery problem

Who is interested in a solar light relay node?

The inaccurate battery display problem for the heltec is solved. If you use the newest WiFi webUI you can change the ADCmultiplier ratio, so no need to recompile the sourcecode anymore. You find this under ‘Settings’ > ‘Power’ > ‘ADC Multiplier Override ratio’ You can calculate the value simple, if the battery is fully charged (4.23 Volt) and the display gives another lower value, divide 4.23 by the displayed value which gives you the new ADC multiplier. I’m thinking about using a helltec …