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Control 7 segment LED displays with AVR

2014-12-15 15:06  
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LED displays are nothing more than sets of Light Emitting Diodes. The difference is that they have different shapes in order to display specific information. So driving LED displays is the same as regular LEDs.

Control 7 segment LED displays with AVR

This is simple connection when there are enough of microcontroller Pins. But if you want to connect more displays you will need more microcontroller pins than it can give you. Then you need to make more advanced circuit with dynamic control.

Control 7 segment LED displays with AVR

The idea of this circuit is very simple. Human eye is inertial and can’t notice fast flicker of images. Thus you need to light only one display at one time, and then switch to another and so on. Refreshing displays like 10 – 15 times a second should be enough to see clear image of all digits.


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