counter up/down and reset value using pic 16F84A, 3 push button and 7 segment display common anode
Seven Segment LED Displays are found in all kinds of devices from clocks and other appliances to instrument panels. They can show time, temperature, speed, direction, capacity and many other types of information about things we want to monitor.
There are two main types of 7 Segment LED Displays:
Common Anode: In this type of display, a positive voltage source is shared by the display segments. Segments are lit by setting their individual pins to Ground.
Common Cathode: A common path to ground is shared by the segments. Individual segments are lit when their pin receives sufficient positive voltage.