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#1 Posted : Friday, June 27, 2008 12:44:58 PM(UTC)

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Is the 5v dc that is applied to the OTTO a constant voltage that switches to the other input will streaming the voltage to it? Then when the voltage is stopped, it switches back to the normally closed?

Or is it momentary?

Not sure how it works.

Brian Donegan  
#2 Posted : Friday, June 27, 2008 1:36:50 PM(UTC)
Brian Donegan

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The 5V and GND power the relay. The TR pin accepts a 5V trigger to activate the relay. If you remove the 5V, the relay disengages. The reason for using the trigger instead of just using a straight 5V to the relay is to allow it to be triggered by something that can't supply enough current for the relay coil, such as a logic or micro-controller output. The trigger circuit (simple resistor and transistor switch) is high impedance, so current draw is minimal. If you wanted to use it by switching the 5V power directly, you could just tie the 5V pin to the TR pin.
#3 Posted : Saturday, June 28, 2008 1:05:29 AM(UTC)

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Hi, Darren

I don't know if it's of any interest to you, but I'm using one with the TR and 5V permanently connected to the 5V
supply and switching it by grounding in the same way as the Darwin does. Actually, I have it switched from a little
circuit that lets me use a momentary switch.

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