Web-Based Water-Level Monitor and Pump Controller

The Web-Based Water-Level Monitor and Pump Controller is an embedded system designed to track fluid levels and manage a motorized pump automatically or through a web interface. At the heart of the system is the ATmega128 microcontroller module (IC1), which serves as the central processing unit responsible for executing the control logic. Five water-level sensors are positioned at various heights within the tank to provide discrete digital inputs representing the current volume of water. The microcontroller reads these sensor states and updates a local 16x2 LCD display to give users a direct visual readout of the water level. For network connectivity, the system utilizes an ENC28J60 Ethernet controller module (IC2), allowing the microcontroller to communicate over a local network. Because the ATmega128 typically operates at 5V logic while the ENC28J60 Ethernet module operates at 3.3V, a 74HCT125 level shifter IC (IC3) is integrated into the circuit to safely bridge the voltage difference for digital signals without causing hardware damage. When the water drops below a certain threshold or a remote web command is received, the ATmega128 triggers a motor pump control relay circuit. This relay acts as an electrically isolated switch, enabling the low-voltage microcontroller to safely control the high-current power supply needed to turn the water pump on or off.