Post by thread:RF remote for a PIC project

PIC purists - lease forgive me. This question is only indirectly PIC related, but what the heck - LCD displays are discussed all the time! Here is the question. I have a project based on a PIC 16C61. The input is connected to 3 buttons. I want to add RF remote to it. My garage door opener seems to have exactly what I want in it - a single chip design with a 3 button input. The problem is that I don't recognize the chip used in it - it is marked 125C67. Does anyone know: 1. What is this chip and who makes them. 2. Is there a place I can get ready made transmitter and receiver modules? I'm aware of the National Semi LM1871/LM1872 chips, but the design seems more compicated - there are only 2 on/off channels and power switch is separate. My remote is activated by a single contact pair (one of three). Thanks. -- -Alex.

At 01:52 AM 6/18/96 +0000, you wrote: {Quote hidden}>PIC purists - lease forgive me. This question is only indirectly PIC >related, but what the heck - LCD displays are discussed all the time! > >Here is the question. I have a project based on a PIC 16C61. The >input is connected to 3 buttons. I want to add RF remote to it. My >garage door opener seems to have exactly what I want in it - a single >chip design with a 3 button input. The problem is that I don't >recognize the chip used in it - it is marked 125C67. >Does anyone know: >1. What is this chip and who makes them. >2. Is there a place I can get ready made transmitter and receiver >modules? > >I'm aware of the National Semi LM1871/LM1872 chips, but the design >seems more compicated - there are only 2 on/off channels and power >switch is separate. My remote is activated by a single contact pair >(one of three). > >Thanks. > >-- >-Alex. > I saw a catalog from Mouser Electronics (I think) about 3 months ago that had little electronic kits for students to build. Unfortunately, some of my lacky senior friends were using these for senior projects. Anyway, I think that there were kits for RF transmitters and recievers. I have a very old catalog here and the number is (800) 346-6873. Hope this helps. Donald Frederick Wright Jr. School info: Lawrence Technological University E-mail: spam_OUTDW79208TakeThisOuTLTU.EDU Work Info: AVL North America E-mail: .....DNWRIGHTKILLspam@spam@AVLNA.COM

>Here is the question. I have a project based on a PIC 16C61. The >input is connected to 3 buttons. I want to add RF remote to it. You might like to check out RF monolithics, Dallas Texas (214) 233 2903 they have a range of low power hybrid Transmitters and Receivers. I don't know if they have a web page? Ray Gardiner, 104 Macintosh Street, Shepparton, Victoria 3630, Australia rayKILLspamnetspace.net.au

> > You might like to check out RF monolithics, Dallas Texas (214) 233 2903 > they have a range of low power hybrid Transmitters and Receivers. I don't > know if they have a web page? > I've been down this path before ! RF Monolithics has some interesting devices but has no interest in dealing in smaller quantities... like, less than 10,000 units. Samples were $50 /ea. Please let me know if anyone discovers otherwise... Chris -- Chris Elmquist, N0JCF .....chriseKILLspam.....n0jcf.com EraseMEn0jcfspam_OUTTakeThisOuTamsat.org

If you don't mind an extra chip you could use a logic gate to get three outputs from your two outputs in the National chips. You know, signal 1, signal 2 and both. Or better yet, have the PIC detect when both signals are present. A lot of three channels remote controls work this way. Rogerio At 01:52 AM 18/06/96 +0000, you wrote: {Quote hidden}>PIC purists - lease forgive me. This question is only indirectly PIC >related, but what the heck - LCD displays are discussed all the time! > >Here is the question. I have a project based on a PIC 16C61. The >input is connected to 3 buttons. I want to add RF remote to it. My >garage door opener seems to have exactly what I want in it - a single >chip design with a 3 button input. The problem is that I don't >recognize the chip used in it - it is marked 125C67. >Does anyone know: >1. What is this chip and who makes them. >2. Is there a place I can get ready made transmitter and receiver >modules? > >I'm aware of the National Semi LM1871/LM1872 chips, but the design >seems more compicated - there are only 2 on/off channels and power >switch is separate. My remote is activated by a single contact pair >(one of three). > >Thanks. > >-- >-Alex. > >

On Wed, 19 Jun 1996, Ray Gardiner wrote: > >Here is the question. I have a project based on a PIC 16C61. The > >input is connected to 3 buttons. I want to add RF remote to it. > > You might like to check out RF monolithics, Dallas Texas (214) 233 2903 > they have a range of low power hybrid Transmitters and Receivers. I don't > know if they have a web page? > Ray Gardiner, 104 Macintosh Street, Shepparton, Victoria 3630, Australia > rayspam_OUTnetspace.net.au Try: http://www.davetek.com/comprep/rfm.htm More of a link that a home page, but at least they can be contacted. Don McKenzie @spam@donmckKILLspamlabyrinth.net.au DonTronics Tullamarine, Australia http://www.labyrinth.net.au/~donmck Picosaurus-74. The 40 pin PICBasic with 8 channels of A-D, and real Uart. PIC Basic Compiler. Programmers from $15 US, and Pic-Axe: A New Tool.

On Tue, 18 Jun 1996, Mike DeMetz wrote: > > 1. What is this chip and who makes them. > > 2. Is there a place I can get ready made transmitter and receiver > > modules? > > > Take a look at the MING TX/RX modules from Digi-Key. Under Holtek > stuff. > Yes, definetly look at these. They are exactly what you need. The Holtek serial encoder/decoder chips are perfect accessories to the ming transmitters, e-mail me if you need any more help. One thing about the ming transmitgters is speed 1200 baud, I wish they had variants that could handle higher speeds. Good luck Neil Gandler KILLspamv064mb9kKILLspamubvms.cc.buffalo.edu

> Yes, definetly look at these. They are exactly what you need. The > Holtek serial encoder/decoder chips are perfect accessories to > the ming transmitters, e-mail me if you need any more help. One > thing about the ming transmitgters is speed 1200 baud, I wish they > had variants that could handle higher speeds. Good luck > > Neil Gandler Is that 1200 baud a limit of the TX/RX or the Holtek encoder/decoders? I called about the bandwidth and was told 10kHz (the instructions say the baud rate is limited by the bandwidth but they do not tell you what that is).

On Wed, 19 Jun 1996, Mike DeMetz wrote: > > Yes, definetly look at these. They are exactly what you need. The > > Holtek serial encoder/decoder chips are perfect accessories to > > the ming transmitters, e-mail me if you need any more help. One > > thing about the ming transmitgters is speed 1200 baud, I wish they > > had variants that could handle higher speeds. Good luck > > > > Neil Gandler > Is that 1200 baud a limit of the TX/RX or the Holtek > encoder/decoders? I called about the bandwidth and was told > 10kHz (the instructions say the baud rate is limited by the bandwidth > but they do not tell you what that is). > In the digikey catalog, the max baud rate is stated as 1200 baud. Neil