Home
JAQForum Ver 24.01
Log In or Join  
Active Topics
Local Time 22:58 06 Nov 2025 Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Microcontroller and PC projects : Synchronous PWM

Author Message
kiiid

Guru

Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 04:00am 01 Jul 2017
Copy link to clipboard 
Print this post

For control of mains-powered stuff zero-cross synchronisation is needed.
Is it possible with the mite?

http://rittle.org

--------------
 
twofingers

Guru

Joined: 02/06/2014
Location: Germany
Posts: 1666
Posted: 04:40am 01 Jul 2017
Copy link to clipboard 
Print this post

  kiiid said   For control of mains-powered stuff zero-cross synchronisation is needed.
Is it possible with the mite?

How about a cheap SSR (solid state relay)?





Regards
MichaelEdited by twofingers 2017-07-02
causality ≠ correlation ≠ coincidence
 
CaptainBoing

Guru

Joined: 07/09/2016
Location: United Kingdom
Posts: 2171
Posted: 11:16am 01 Jul 2017
Copy link to clipboard 
Print this post

really easy to detect

http://www.fruitoftheshed.com/Circuit%20Ideas.Really-Simple-Zero-Crossing-Detect.ashx?HL=zero

I use this to allow switching within a few volts of the ZCP:

Power demand, monitor this input for the pulse and make your move.

If you use a conventional relay the type of load isn't important; capacitive, inductive etc.
 
Geoffg

Guru

Joined: 06/06/2011
Location: Australia
Posts: 3308
Posted: 11:22am 01 Jul 2017
Copy link to clipboard 
Print this post

  kiiid said   For control of mains-powered stuff zero-cross synchronisation is needed. Is it possible with the mite?

Not easy to do in MMBasic. I had a look at it some time ago but it is worth revisiting.

Geoff
Geoff Graham - http://geoffg.net
 
Zonker

Guru

Joined: 18/08/2012
Location: United States
Posts: 772
Posted: 06:44pm 03 Jul 2017
Copy link to clipboard 
Print this post

Phase control would be awesome also..!
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10554
Posted: 01:51am 04 Jul 2017
Copy link to clipboard 
Print this post

  Quote  Is it possible with the mite?


Yes with a CFunction

There is a hook into the INT2 hardware interrupt available to the CFunction (CFuncInt2). This was specifically included by Geoff for this sort of application.
 
Print this page


To reply to this topic, you need to log in.

The Back Shed's forum code is written, and hosted, in Australia.
© JAQ Software 2025