Positive sensing zero-crossing detector.

[Artie]

All sooo simple in software

Jan

Yeah, that's ultimately where I'm going with this. Fortunately, I have a few decades of programming in QBasic. (The language of the Picaxe.)

 

[jan.didden]

Yeah, that's ultimately where I'm going with this. Fortunately, I have a few decades of programming in QBasic. (The language of the Picaxe.)

I'm not good at remembering syntax. I use Flowcode.

Jan

 

[Art M]

"12ms is approximately 75% of a 60-cycle wavelength, so it holds the TRIAC triggered long enough to get past the 1st zero-crossing point, and then lets the TRIAC shut itself off at the end of the complete cycle"

This seems like a Soft Trigger. I recollect that a SCR/ TRIAC can act in funny ways without a Hard Trigger ?

 

[Artie]

This seems like a Soft Trigger. I recollect that a SCR/ TRIAC can act in funny ways without a Hard Trigger ?

Hey Art. I'm not sure what you mean by "soft" or "hard" trigger. I would be sending an appropriate voltage pulse to the TRIAC. Do you mean a pulse generated by software, as opposed to being generated by discrete components?