User Manual

97
Common Cathode 7-Segment Display
In a common cathode display, the cathodes of all the LED segments are connected to the
logic "0" or ground. Then an individual segment (a-g) is energized by a "HIGH", or logic "1"
signal v ia a current limiting resistor to forward bias the anode of the segment.
Common Anode 7-Segment Display
In a common anode display, the anodes of all the LED segments are connected to the logic
"1". Then an individual segment (a-g) is energized by a ground, logic "0" or "LOW" signal v ia a
current limiting resistor to the cathode of the segment.
In this experiment, a common cathode 7-segment display is use. It should be connected to
ground. When the anode of an LED in a certain segment is at high level, the corresponding
segment will light up; when it is at low, the segment will stay dim.
The schematic diagram is shown as below:
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