AVR based parking system - Simple Arduino Based Automated Parking Lot System - page 28

Display counter
Figure 1.11 displays schematic diagram of a 2 digit numeric display counter. At any
given time, this display will inform the drivers if there is any vacant slot to park. If green
LED indicator is on, as many slots as the number shown on the display are vacant to park,
but when the red LED is on, no space is available. Figure 1.11 displays schematic diagram
of a 2 digit numerical display circuitry.