Inkplate 2 battery voltage readout via Arduino library

Soldered_Bot · January 18, 2026, 9:58pm

Customer:

Is there a way to get the battery status (voltage) via the Arduino library for the Inkplate 2? I searched around but found nothing.

I’m trying to use it as a weather widget on my wall and am looking for some sort of indication that it’s time to charge the battery.

Originally submitted via email support on 18 January 2026. Migrated to the forum for community visibility.

Soldered_Bot · January 19, 2026, 1:41pm

Soldered Support:

There isn’t a way to get the voltage from the Inkplate 2 battery programmatically, as it would require a voltage divider, which just wouldn’t fit on the PCB. You can make your own voltage divider which would be connected to the positive pad of the battery and to a GPIO pin, you could then read the analog voltage value from it to get the battery state. This is how it is done on other models, and the code is available here:

github.com/SolderedElectronics/Inkplate-Arduino-library

src/include/System.cpp

26e72c3fb


      
          
          #endif
          
          
          #ifndef ARDUINO_INKPLATE2
          /**
           * @brief       readBattery reads voltage of the battery
           *
           * @return      returns battery voltage value
           */
          double System::readBattery()
          {
              // Read the pin on the battery MOSFET. If is high, that means is older version of the board
              // that uses PMOS only. If it's low, newer board with both PMOS and NMOS.
              pinModeInternal(IO_INT_ADDR, ioRegsInt, 9, INPUT);
              int state = digitalReadIO(9, IO_INT_ADDR);
              pinModeInternal(IO_INT_ADDR, ioRegsInt, 9, OUTPUT);
          
              // If the input is pulled high, it's PMOS only.
              // If it's pulled low, it's PMOS and NMOS.
              if (state)