My project is nearing completion, just need to make minor tweaks (which are taking forever )
I`m using a MMC74C925 which is a counter with built in 7 Seg Mutiplexer/driver. I need to design some sort of a circuit using a single photo resistor to adjust the brightness of the LED`s.
The simplest is to put a common-emitter transistor on pin 9 and adjust the brightness with a 100k pot between base and 5v rail. Then put your LDR across the pot.
No luck with the common emitter and the ground pin.
However, I got it to work with the V+ pin. I took the collector to Vcc and the emitter to the V+ pin and the base to Vcc via Resistor and parallel LDR. Works like a charm.