Hey guys, I would like to use this SSR: http://media.digikey.com/pdf/Data%20Sheets/Sharp%20PDFs/S116,216S02.pdf for a project I'm working on, but the input voltage is only 1.2V at 20mA. I was thinking the best way to get this would be to put two diodes in series to ground with a current limiting resistor connected should drop the 5V down to 1.2V from the output pin of the arduino.
What do you all think? Is there a better way?
Thanks,
Jeremy
No... you are over thinking it.
Nearly all standard LED's operate at 1.2 Volts and roughly 20 Ma.
You can treat the SSR input just like any other LED... making SURE to have the current limiting resistor. You can start with your choice 1K Ohm resistor, but you might be able to drop that down to 470 ohm or so and no harm done. (See Ohms Law)
I think 1K will only let about 3.5ma feed the LED and that is probably going to be a very light touch. You could even go to 220OHM and only then would it be close to 20ma.
pete
Yeah, I was totally over thinking that. Thanks for the cold splash.