Post by thread:[PIC]: Source for Optical Encoder Disc

Hi, Does anybody know a source that I would be able to purchase encoder discs from ? I am looking for a small disc (1 in.) to place on an axle and then read the result with an optical encoder to determine RPM, for a PIC based mobil robot. I don't have access to any machine shop tools so rolling my own isn't working out to well. I've tried hacking a mouse wheel, but the results were disappoiting. Thanks in advance, Kevin Please Reply To: spam_OUTPICLISTTakeThisOuTMITVMA.MIT.EDU -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

There are photoetching houses that will etch anything for you if you give them camera-ready artwork. You should be able to get a letter size sheet of thin brass with as many encoder disks as will fit for under US$100. They might even anodize them black for you. Look at http://www.fotofab.com, but there are lots of others. Doug Butler Sherpa Engineering > {Original Message removed}

My solution to anything like this is to use an old mouse (or a new one ! I pay 0.50 ukp for a mouse). You get 2 nice encoder wheels and the IR detectors to boot. Cheers Dom ----- Original Message ----- From: "Doug Butler" <SherpadougKILLspamATTBI.COM> To: <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Sent: Monday, September 02, 2002 12:31 PM Subject: Re: [PIC]: Source for Optical Encoder Disc > There are photoetching houses that will etch anything for you if you give > them camera-ready artwork. You should be able to get a letter size sheet of > thin brass with as many encoder disks as will fit for under US$100. They > might even anodize them black for you. Look at http://www.fotofab.com, but there > are lots of others. > > Doug Butler > Sherpa Engineering > > > > {Original Message removed}

Hej Kevin A. Benedict. Tack för ditt meddelande 16:47 2002-09-02 enligt nedan: >encoder discs from ? I am looking for a small disc (1 in.) >to place on an axle and then read the result with an optical encoder Dissassemble a cheap PC mouse. Then you get two small discs and also two compatible reader pairs :) Or keep the controller, it report both axis movments plus two buttons on 5V serial 9600baud. -Only one pin needed on the PIC! But you get delay in the response then. Farnell have industrial grade discs and reader. /Morgan -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

On Mon, 2 Sep 2002, Kevin A. Benedict wrote: >Hi, >Does anybody know a source that I would be able to purchase >encoder discs from ? I am looking for a small disc (1 in.) >to place on an axle and then read the result with an >optical encoder to determine >RPM, for a PIC based mobil robot. >I don't have access to any machine shop tools so rolling >my own isn't working out to well. I've tried hacking a mouse >wheel, but the results were disappoiting. Depending on what you are trying to do and how much time you want to spend normal PCB spray-on photoresist and copper or aluminium flashing will go a long way. Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

At 10:47 AM 9/2/02 -0500, you wrote: >Hi, >Does anybody know a source that I would be able to purchase >encoder discs from ? I am looking for a small disc (1 in.) >to place on an axle and then read the result with an >optical encoder to determine >RPM, for a PIC based mobil robot. >I don't have access to any machine shop tools so rolling >my own isn't working out to well. I've tried hacking a mouse >wheel, but the results were disappoiting. If you can mount a piece of film, it's easy to have the output made. Here's an example of Gray-code artwork that I wrote the code to generate:- http://www.speff.com/gray_wheel.gif It would be easy to do if you had access to a small lathe, but I'm afraid anything is going to be difficult without tools at hand. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" RemoveMEspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com 9/11 United we Stand -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body

Hello Kevin & PIC.ers, The `best' answer will depend on what number of slots you want on the disk. You don't need quadrature encoding as this is only for RPM detection, so I'll suppose a course slot number will be OK. I've worked on machines where this was successfully done by a photographic negative ( celluloid? ). A photo had been taken of the correct pattern, in black & white. Detection is then by slotted opto-coupler, TIL138 or so. best regards, John {Quote hidden}>Date: Mon, 2 Sep 2002 10:47:58 EST >From: "Kevin A. Benedict" <TakeThisOuTkbenEraseMEspam_OUTDCA.NET> >Subject: [PIC]: Source for Optical Encoder Disc > >Hi, >Does anybody know a source that I would be able to purchase >encoder discs from ? I am looking for a small disc (1 in.) >to place on an axle and then read the result with an >optical encoder to determine >RPM, for a PIC based mobil robot. >I don't have access to any machine shop tools so rolling >my own isn't working out to well. I've tried hacking a mouse >wheel, but the results were disappoiting. > >Thanks in advance, >Kevin e-mail from the desk of John Sanderson, JS Controls. Snailmail: PO Box 1887, Boksburg 1460, Rep. of South Africa. Tel/fax: Johannesburg, South Africa (011) 893 4154 Cellphone no: 082 741 6275 email: RemoveMEjsandTakeThisOuTpixie.co.za Manufacturer & purveyor of laboratory force testing apparatus, and related products and services. -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestEraseME.....mitvma.mit.edu

Thanks to all that responded. USDIGITAL has what I was looking for, now if I can find a friend that needs 24,990 encoders, it will be in my price range. :) Thanks again, Kevin >Fwded on behalf of Brian Harris >======================== > >Try http://www.usdigital.com/products/disklinear/ >They have a variety of disc and hub sizes and pickups to suit. > >Cheers, > BH -- http://www.piclist.com hint: To leave the PICList RemoveMEpiclist-unsubscribe-requestEraseMEEraseMEmitvma.mit.edu

Well, I wasn't looking for you, but I have just bumped into this website and they probably have what you want and not too expensive: http://www.didel.com/microkit/pricelist/ David "Kevin A. Benedict" wrote: {Quote hidden}> Hi, > Does anybody know a source that I would be able to purchase > encoder discs from ? I am looking for a small disc (1 in.) > to place on an axle and then read the result with an > optical encoder to determine > RPM, for a PIC based mobil robot. > I don't have access to any machine shop tools so rolling > my own isn't working out to well. I've tried hacking a mouse > wheel, but the results were disappoiting. > > Thanks in advance, > Kevin > > Please Reply To: RemoveMEPICLISTspam_OUTKILLspamMITVMA.MIT.EDU > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

>If you can mount a piece of film, it's easy to have the >output made. Here's an example of Gray-code artwork that >I wrote the code to generate:- > >http://www.speff.com/gray_wheel.gif You can always print a large BW copy of the artwork, photograph it with your slr camera and take the film negatives. You can make scales etc up to 18mm on a side like this. I once made a graduated wedge for a photometer like this, and it worked great. The printer errors are scaled down tens of times by the process. Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads