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HowTo: Build a 16 Ch PicDimmed Renard with SSRs onboard!
( Dave Johnson)
Step 24 : Opto Isolator Triac Trigger
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U1 = PIC
U13 = MOC3023
The green trace is an example of a control signal from the PIC output PIN (which operates from 0 to 5VDC) that goes to the cathode of the OptoIsolator and causes it to lower or raise the impedance between the two “Main Terminal” pins, causing the AC current to flow or not (lights go on and off! Now we are getting somewhere!)
If you have done everything correctly, everything above the “5VDC” text will be low voltage, everything below the “120VAC” text will be high voltage.
(http://forums.parallax.com/forums/default.aspx?f=21&m=61194)
The triac trigger is a device that provides 5 V inputs to an internal LED (through a suitable current-limiting resistor) on one side and a 120 VAC optically triggered triac on the other side. This device electrically isolates the 120 VAC side of the circuit from the logic level side of the circuit. Using a triac to trigger the main triac solves the problem of triggering the main triac on the positive or negative voltage portion of the AC sine wave.
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