![]() As shown in the figure above, we can control activating four seven-segment LEDs by using 4 PNP transistors AN0-AN3. Similarly, LED 2 - LED 4 can be displayed by using the same way at different times. For example, when we activate LED 1 by driving A1 high and the other three LEDs (LED 2, LED 3, LED 4) are deactivated (A2, A3, and A4 not driven), the cathode pattern (CA-CG) will be used for displaying numbers on LED 1. Thus, to display 4 different numbers on the 4-digit seven-segment LED display, we have to control the cathodes (CA-CG) of the four seven-segment LEDs separately by activating the four seven-segment LEDs at different times.
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