opto-coupler to emulate a button press?

A

AlainD

Well-known member
Hi

I need to a teensy to emulate a pressing a button from normaly open to close. The "other side" has at least 5V and maybe spikes to a 20V or so. Ground will be different from teensy ground (different power supply).

I'm thinking of using a pc817 optocoupler input fed by a teensy digital out 3.3V and about 4mA (with a calculated resistor) going to teensy ground.
I would add a resistor in series to the output side off the opto- coupler to limit the current to a safe value (a bit of experimentation from high to low resistor values).

Is this a reasonable way of doing such a thing?
 
I don't see why not. I have used opto-couplers to enable 3.3v to "fire" [while electrically isolated from] higher voltage systems. I make use of these opto-couplers: 6N138
 
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