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So, it's the holding current - the LEDlights don't draw enough (not one string, nor two.) 2) I ran the LED holiday light string along with a 40W lamp and had much better results. I'm speculating, but I think that the LEDs, being a low-current affair, can't make the TRIAC's holding current and end up dropping out prematurely. The results with a 40W lamp are really good, but managing a string of LED holiday lights leaves much to be desired. I have been using "TRIAC", my preference. Should I use Triac when it's the first word of a sentence and triac otherwise? A textbook of mine, "Industrial Solid-State Electronics", uses the latter. Volatile boolean zeroCrossed = false // flagĪttachInterrupt(0,Triac_cue,RISING) // Ext_Int on D2 But I confess that I'm squishy on it right now - preferring to bask in the glow of my present success before plunging into a power factor situation.īefore that, though, I want to take some pictures of the TRIAC output on the scope.īyte GatePulseTime = 1 // at or near Alt start The zero-cross signal is awaited, its occurrence initiates the Interrupt whereupon the DIPs are read and thereby the delay time determined, then shortly the Gate signal pulses after the appropriate delay time and the process repeats.Īs there's a snubber across the TRIAC and a snubber for the gate, too, I do intend to try it all out with a fan. This is a research project and these few well-defined options are sufficient. Obviously, more resolution could be had with more switches, that's academic enough, but my objective was not some high degree of (or seemingly continuous) variability.
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The default is 1 msec and the DIPs are binary weighted With that, the conduction angle can be set to approximately 158, 135, 112, or 90 degrees. The delay angle is selectable via two DIP switches. The Arduino gets zero-crossing pulses from U1's output at D2, one of its hardware interrupt pins. I used 3 6.2 kΩ (1W) resistors in series. The resistor on U1's input (between AC Line and U1 pin_1) is 18.6 kΩ. The line frequency is detected by finding the zero-cross, the point where the line voltage is at or near zero, which occurs with each alternation (half-cycle). Dimming cannot be effected by triggering the gate indiscriminately triggering (firing) must be done synchronized with the line frequency.
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This is an application of what's known as "random fire" (or random-firing) technique for full phase control.