Rain detector

I have a rain sensor hl-83 and a control board hl-01.
I know I need a +5 vdc power supply.
I nee help interfacing the DO TTL of the control board to a device with a relay output to sound a small bell.

Thank, John

I'm curious to hear more about your rain sensor. Is it accurate for misty rain? Do you need drizzle? Does it work well?

John

Interesting article here....
http://www.edcheung.com/automa/rain.htm

John