Else try to ‘retune’ the sensor circuits. Further, even as the Vcc2 is at 6V, the water pump motor (M1) can only see a voltage in 4.2-4.6V scale but that’s enough to meet the purpose. Idle state ...

Automatic Water Tank Pump Switch Hardware • Microcontroller Unit: The designed circuit shown here includes an Atmega328P-PU as the kernel, a number of LEDs to display the system status, a push button ...