Chasing Illuminated Staircase: Difference between revisions
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==The Control Circuit== | ==The Control Circuit== | ||
A circuit had to be designed to allow the 0-10volt [[analogue control signal]] to power the relays that would turn each step's lamps on and off. The signal from the demultiplexer did not provide enough current to drive the relay coil nor enough to drive a transistor. | A circuit had to be designed to allow the 0-10volt [[analogue control signal]] to power the relays that would turn each step's lamps on and off. The signal from the demultiplexer did not provide enough current to drive the relay coil, nor enough to drive a transistor. Therefore, the signal from the multiplexer had to be stepped up in two stages. First it was passed through a 4011 NAND gate, then through a transistor & finally passed over the coil of the relay. | ||
