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Topic: Two 7-segment displays crammed into my tiny breadb (Read 3097 times) previous topic - next topic

jarjan

I have better solution hov drive display. You ought to use PNP transistor BC 556B. Emitter to +5V, and collector to anode (3) of display, base  through 10k ohm you can drive by LOW on P3.0 (P3.1) which open transistor and release current through the LED. You ought to use minimum 220 ohm rezistor (330 ohm may be better for Arduino) to lower LEDs current.  

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