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Forum Index : Microcontroller and PC projects : Synchronous PWM

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kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 04:00am 01 Jul 2017
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For control of mains-powered stuff zero-cross synchronisation is needed.
Is it possible with the mite?

http://rittle.org

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twofingers

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Joined: 02/06/2014
Location: Germany
Posts: 1772
Posted: 04:40am 01 Jul 2017
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  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)?





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CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2171
Posted: 11:16am 01 Jul 2017
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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

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Joined: 06/06/2011
Location: Australia
Posts: 3368
Posted: 11:22am 01 Jul 2017
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  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

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Joined: 18/08/2012
Location: United States
Posts: 772
Posted: 06:44pm 03 Jul 2017
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Phase control would be awesome also..!
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 11889
Posted: 01:51am 04 Jul 2017
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  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.
 
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