AVR based parking system - Simple Arduino Based Automated Parking Lot System - page 30

Sixteen toggle switches to indicate presence of cars parked
Figure 1.12 displays the schematic circuitry of an input device related to one of 16
sensors to be activated when a car is parked in the parking space. When any of these toggle
switched is depressed, the green LED turns off and the red one turns on, to inform the mi-
crocontroller that a car is parked on the corresponding slot.