[Logic Circuit] LED 8*8 dot matrix scrolling circuit using the CD4022 IC
Автор: EE-WEI
Загружено: 2023-06-22
Просмотров: 1515
Описание:
For this circuit, We are not using any programming or microprocessors (e.g., Arduino). Instead, we are relying solely on hardware logic circuits to accomplish the task. In Part 1, the NE555 provides a scanning frequency range of 7Hz to 480Hz. Moving on to Part 2, the CD4022 receives the scanning frequency from the NE555 and outputs Q0 to Q7, which controls the display of each row of LEDs and the dial switch. Lastly, in Part 3, NPN transistors and the ULN2803 are utilized to drive the 8x8 LED dot matrix.
#What's crazy about this circuit is that it uses 64 diodes, and you have to make the diode matrix component yourself.
#An area for improvement is the issue of inconsistent LED brightness.
#ne555 : https://www.ti.com/lit/ds/symlink/ne5...
#cd4022 : https://www.ti.com/lit/ds/symlink/cd4...
#uln2803 : http://www.unisonic.com.tw/datasheet/...
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