Post by thread:[PIC:] Sample circuits for 240V Lamp dimmer?

Andre Miller wrote : > Does anyone know of any sample circuits to build a lamp > dimmer controlled by a PIC? I actually have no idea > where to start. I did a search on the piclist > and found how to dim a LED using PWM. > > I want to dim a 240V AC, 200 Watt incandescant lamp. It > would be nice if I could drive more than one dimmer from > a PIC16F628. Hi. Search for "triac" and/or "opto-triac". What specificaly is it about this issue that you are unsure about ? Timing ? Connection ? Selection of components ? Driving multiple triacs would be a little more harder then a single line with regard to the timing (phase control). I have a half-developed (software more or less ready, but no 240V connection yet) for a 12F629. Phase control (50Hz), and an IR interface ("on", "off", "up", "down" and "set-to-specific-level" command on the IR link. Saving of the dim-level in EEPROM. Soft-on when powered on to the saved level. It uses software for a 18F1220 in a "remote" unit using a rotary encoder for the up/down control. Jan-Erik. This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you. E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

You can go here for background info (WOW, so turquoise !) http://ubasics.com/adam/electronics/doc/phasecon.shtml A zero-crossing detector http://home.clear.net.nz/pages/joecolquitt/txless.html Basically what you need to do is find the start of the cycle so that the micro can do its timing and fire the triac at the correct point. The triac will turn itself off at almost the next zero-cross It will be very helpful if you have a dual-beam oscilloscope (don't forget to isolate the circuit !!) so that you can see both the input and output to fine tune the timing -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Andre Miller wrote : > I'm mostly looking for how to actually design the triac load > driving circuit... Every major triac manufacturer has *loads* of application notes about this. For a simple solution (not the cheapest), look at the Sharp line of opto-triacs. See : http://dkc3.digikey.com/PDF/T041/1024.pdf for a good list of them. Check the specific Digikey part no's for a data sheet on each. Or combine a standard traic with a low-power opto-triac-trigger (such as the MOC-xxxx line). > ...and how to get the zero-crossing input to the PIC. I'd suggest a "AC-opto-coupler". These was made for this task. Just look around, triacs is an area with a lot of information, data sheets and application notes "out there". Jan-Erik. This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you. E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Well unless I'm being clumsy :-) _____ André Miller -----Original Message----- From: pic microcontroller discussion list [spam_OUTPICLISTTakeThisOuTMITVMA.MIT.EDU] On Behalf Of Byron A Jeff Sent: 06 February 2004 04:26 PM To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU Subject: Re: [PIC:] Sample circuits for 240V Lamp dimmer? On Fri, Feb 06, 2004 at 01:35:51PM +0200, Andre Miller wrote: > Thanks Jan, > > This is enough to get me started, I'm sure I'll be back after blowing > a few pic's to ask more questions ;-) If you use an opto-triac, there is no reason why you would blow up any PICs, as the opto-triac is designed to isolate your low voltage circuitry from the high voltage circuitry. BAJ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Well, Imagine how bright we brits can get them on 240V... -----Original Message----- From: pic microcontroller discussion list [PICLISTKILLspamMITVMA.MIT.EDU]On Behalf Of Ted Melton Sent: 06 February 2004 16:22 To: .....PICLISTKILLspam.....MITVMA.MIT.EDU Subject: Re: [PIC:] Sample circuits for 240V Lamp dimmer? You won't believe how BRIGHT a PIC (JW) glows when 120 VAC accidently goes throught it :-) Ted Andre Miller wrote: {Quote hidden}>Thanks Jan, > >This is enough to get me started, I'm sure I'll be back after blowing a few >pic's to ask more questions ;-) > > _____ > >Andri Miller > > > >-----Original Message----- >From: pic microcontroller discussion list [EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU] On {Quote hidden}>Behalf Of Jan-Erik Soderholm XA (TN/PAC) >Sent: 06 February 2004 12:18 PM >To: PICLISTspam_OUTMITVMA.MIT.EDU >Subject: Re: [PIC:] Sample circuits for 240V Lamp dimmer? > > >Andre Miller wrote : > > > >>I'm mostly looking for how to actually design the triac load driving >>circuit... >> >> > >Every major triac manufacturer has *loads* of >application notes about this. > >For a simple solution (not the cheapest), look at the >Sharp line of opto-triacs. See : http://dkc3.digikey.com/PDF/T041/1024.pdf >for a good list of them. Check the specific Digikey part no's for a data >sheet on each. > >Or combine a standard traic with a low-power >opto-triac-trigger (such as the MOC-xxxx line). > > > > >>...and how to get the zero-crossing input to the PIC. >> >> > >I'd suggest a "AC-opto-coupler". These was made for this task. > >Just look around, triacs is an area with a lot of >information, data sheets and application notes "out there". > >Jan-Erik. > >This communication is confidential and intended solely for the addressee(s). {Quote hidden}>Any unauthorized review, use, disclosure or distribution is prohibited. If >you believe this message has been sent to you in error, please notify the >sender by replying to this transmission and delete the message without >disclosing it. Thank you. > >E-mail including attachments is susceptible to data corruption, >interruption, unauthorized amendment, tampering and viruses, and we only >send and receive e-mails on the basis that we are not liable for any such >corruption, interception, amendment, tampering or viruses or any >consequences thereof. > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> From: Andre Miller[SMTP:@spam@andre.millerKILLspamBLUERIVER.CO.ZA] > Sent: Friday, February 06, 2004 4:39 AM > To: KILLspamPICLISTKILLspamMITVMA.MIT.EDU > Subject: [PIC:] Sample circuits for 240V Lamp dimmer? > Hi, > Does anyone know of any sample circuits to build a lamp dimmer controlled by > a PIC? I actually have no idea where to start. I did a search on the piclist > and found how to dim a LED using PWM. > I want to dim a 240V AC, 200 Watt incandescant lamp. It would be nice if I > could drive more than one dimmer from a PIC16F628. > Andre' Miller See Circuit Cellar #144, July 2002, page 21: "AVR MCU-Based AC Phase Controller". The circuit shown uses an Atmel AT90S2313, but the idea can be ported to a PIC. The circuit is for 120 volt line. To adapt to 240 volts, the triac and optocoupler (MOC3009) will have to be upgraded for voltage. The software is available for download from the Circuit Cellar web site; it could be used as a guide for writing your own PIC code. John Power -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Hi John, Do you know if this article is available online? I tried going to http://www.circuitcellar.com but couldn't find that specific article online (found two others from the same issue though). - See Circuit Cellar #144, July 2002, page 21: "AVR MCU-Based AC Phase Controller". The circuit shown uses an Atmel AT90S2313, but the idea can be ported to a PIC. The circuit is for 120 volt line. To adapt to 240 volts, the triac and optocoupler (MOC3009) will have to be upgraded for voltage. The software is available for download from the Circuit Cellar web site; it could be used as a guide for writing your own PIC code. John Power -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

"John N. Power" <spamBeGonejpowerspamBeGoneBCPL.NET> wrote:> From: Andre Miller[SMTP:TakeThisOuTandre.millerEraseMEspam_OUTBLUERIVER.CO.ZA] > Sent: Friday, February 06, 2004 4:39 AM > To: RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU > Subject: [PIC:] Sample circuits for 240V Lamp dimmer? > Hi, > Does anyone know of any sample circuits to build a lamp dimmer controlled by > a PIC? I actually have no idea where to start. I did a search on the piclist > and found how to dim a LED using PWM. > I want to dim a 240V AC, 200 Watt incandescant lamp. It would be nice if I > could drive more than one dimmer from a PIC16F628. > Andre' Miller See Circuit Cellar #144, July 2002, page 21: "AVR MCU-Based AC Phase Controller". The circuit shown uses an Atmel AT90S2313, but the idea can be ported to a PIC. The circuit is for 120 volt line. To adapt to 240 volts, the triac and optocoupler (MOC3009) will have to be upgraded for voltage. The software is available for download from the Circuit Cellar web site; it could be used as a guide for writing your own PIC code. John Power -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. Try this link: http://www.mikroelektronika.co.yu/english/magazine/articles/03.htm bye --------------------------------- Do you Yahoo!? Yahoo! Finance: Get your refund fast by filing online -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservEraseME.....mitvma.mit.edu with SET PICList DIGEST in the body

> From: Andre Miller[SMTP:EraseMEandre.millerBLUERIVER.CO.ZA] > Sent: Monday, February 09, 2004 2:55 AM > To: RemoveMEPICLISTEraseMEEraseMEMITVMA.MIT.EDU > Subject: Re: [PIC:] Sample circuits for 240V Lamp dimmer? > Hi John, > Do you know if this article is available online? I tried going to > http://www.circuitcellar.com but couldn't find that specific article online (found > two others from the same issue though). >> See Circuit Cellar #144, July 2002, page 21: "AVR MCU-Based AC Phase >> Controller". The circuit shown uses an Atmel AT90S2313, but the idea can be >> ported to a PIC. The circuit is for 120 volt line. To adapt to 240 volts, >> the triac and optocoupler (MOC3009) will have to be upgraded for voltage. >> The software is available for download from the Circuit Cellar web site; it >> could be used as a guide for writing your own PIC code. >>John Power I should have mentioned this along with the other information: The article is one of two which were bundled together as a pair of short project articles. The combined article is titled "Short Solutions". The second article (actually the first of the two) is "Build a Graphics LCD Bias Supply". John Power -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservspam_OUTKILLspammitvma.mit.edu with SET PICList DIGEST in the body