Keyestudio ARDUINO maker learning kit, Manual

Page: 103 / 162

keyestudio
www.keyestudio.cc
101
with common anode and display with common cathode. Common anode display refers to the one
that combine all the anodes of LED units into one common anode (COM).
For the common anode display, connect the common anode (COM) to +5V. When the cathode
level of a certain segment is low, the segment is on; when the cathode level of a certain segment is
high, the segment is off. For the common cathode display, connect the common cathode (COM) to
GND. When the anode level of a certain segment is high, the segment is on; when the anode level
of a certain segment is low, the segment is off.
Common cathode 7-segment display
Each segment of the display consists of an LED. So when you use it, you also need use a
current-limiting resistor. Otherwise, LED will be burnt out. In this experiment, we use a common
cathode display. As we mentioned above, for common cathode display, connect the common
cathode (COM) to GND. When the anode level of a certain segment is high, the segment is on;
when the anode level of a certain segment is low, the segment is off.
Hardware required
Eight-segment display*1
220Ω resistor*8
Breadboard*1
Breadboard jumper wires*several
Circuit connection
Connection for uno R3: