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Topic: relay shield? (Read 395 times) previous topic - next topic

Hi, what's the largest # of relay channels the arduino can handle?

What I'd like to do is use relays to control a stepped attenuator or TVC with a bluetooth module (and android using btinterfaces).

Thanks,
Joe

LarryD

Each o/p can power a driver transistor or driver chip which in turn can drive a relay.
You can use multiple extender ICs, registers that can be placed in series to extend your relay count.

Why not tell us how many relays you need to drive?
The way you have it in your schematic isn't the same as how you have it wired up!

23 steps x 2 channels. 

I was thinking of removing the physical switches for relays, control via bt and arduino.

LarryD

Which Arduino chip/board are you thinking of using?
The way you have it in your schematic isn't the same as how you have it wired up!

LarryD

Review this:
http://tronixstuff.wordpress.com/2011/08/26/tutorial-maximising-your-arduinos-io-ports/
The way you have it in your schematic isn't the same as how you have it wired up!

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