This simple setup illustrates how to to build a potential network using a ESP32 S3 processor plus the 1k ohm resistance. Using placing pair of resistances on sequence, one can lower a electrical amount to an measurement http://theengineerstore.in/products/12v-mini-spot-welding-machine-automatic-control-10awg-multiwire-portable-transistor-18650-lithium-battery-spot-welder