Tell us about yourself!

Complete Your Profile
  • synchroma commented on diy_bloke's instructable Arduino controlled light dimmer3 years ago
    Arduino controlled light dimmer

    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.

    View Instructable »
  • synchroma commented on diy_bloke's instructable Arduino controlled light dimmer3 years ago
    Arduino controlled light dimmer

    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

    View Instructable »