Page 17 - ARM Based Microcontroller Projects Using MBED

1.2 EXAMPLE MICROCONTROLLER-BASED CONTROL SYSTEM 3

FIG. 1.1 Manual liquid level control system.

FIG. 1.2 Microcontroller-based liquid level control system.

the microcontroller via a liquid level sensor device. The program running inside the micro-
controller compares the actual liquid level with the desired level and then actuates the pump
automatically in order to keep the liquid at the desired level. If the liquid inside the tank is
low, the microcontroller operates the pump to draw more liquid from the reservoir.