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I've checked my board layout and it's exactly the same circuit as yours. Could it be my choice of TRIAC? BAC30-800W
?I changed it to 180R and the voltage dropped to 1.3V
AC 239V (as expected - I am in the UK)DC was 1.17 which I thought was a bit low, so I changed R2 from 470R to 270R. Now it's 2.21 which may be still a bit low according to the datasheet. I'll go lower still and see if it works.
Hello. I made a board for the circuit, although I couldn't get the TIC206 and found a replacement. In fact I've tried 2 TRIACs and have no clue why it's not working after studying the datasheets. I have some images of testing. The first is the output of the 4N25 zero-crossing detector (1V/div, x1 probe), the 2nd is the arduino output to the circuit, and the 3rd and 4th are the output (pin 4) of the MOC3021, 5v/div, x1 probe and x10 probe. Looks like a little less than 220V RMS to me, but this is feeding the gate of the TRIAC. This happened with both the MAC228A and BTA30-800 TRIACS.The bulb briefly flashes when I touch the scope probe to the gate. What do you think I've got wrong?
And I tried a simple HIGH on the arduino with no joy
Nupe.Those two dots are from a test program I adapted from your code. They are from the arduino and go back and forth as I cycle from 5 to 128 and back.I'll go through it with a multimeter tonight and check for shorts