Read Digital icon Read Digital — Read TTL digital input from an ARC I/O port; real-time red/green status for low (0V) or high (+3.3/5V), selectable board/port and read interval. Try it →

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South Africa
#1  

I am new to EZ-B, but if you can toggle a led or switch led on and off with EZ-B, you can switch/control relay. Obviously most probably with transistor. I say this because I got a led toggled on and off with simple speech via the ARC. To replace the led with transistor, resistor and relay should go well.

#2  

A TIP 120 transistor lets you use a DO port as a switching port and you can get the power from anywhere.

#3  

@ RCStartToFinish

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Rex Gordon

#5  

The PicoSwitch is nice. It costs $19.99 + shipping.

Another one that has four relays for $28.95 + shipping can be found here: superdroidrobots.com

The parts for the 2N2222 circuit above are about $2 to $5 depending on where you get them. It just depends on whether you are comfortable building your own circuits (which I love doing for something like this application):D

#6  

@rgordon I agree the less expensive way is to just build the circuit, but the switch I mentioned just makes it easier (and more expensive)