rsd@sei.cmu.edu (Richard S D'Ippolito) (02/10/89)
In article <5093@b-tech.ann-arbor.mi.us> Jon Zeeff writes: >What we really need is a IR control with a serial port (instead of buttons) >for input. Yep. While we're back to the subject of IR remote controls, does anyone know of a source for the IR transmitter/receiver chip set so that I can make my own system similar to the ones used in audio/TV devices? They have to be cheap, as they're so ubiquitous. Short of ripping a VCR and controller apart to find out what they use in the transmitter and receiver or buying a service manual (and probably getting cryptic Japanese part numbers!), how do I get the encoder/decoder chips sets and find out what the encoding standard(s) are? If you can point me to the parts and spec, I'll help you to interface them to a RS-232C port. Rich -- --------------------------------------------------------------------------- Ideas have consequences. RSD@sei.cmu.edu Richard Weaver ---------------------------------------------------------------------------
rosso@sco.COM (Ross Oliver) (02/15/89)
In article <8504@aw.sei.cmu.edu> rsd@ae.sei.cmu.edu.UUCP (Rich D'Ippolito) writes: >In article <5093@b-tech.ann-arbor.mi.us> Jon Zeeff writes: > >>What we really need is a IR control with a serial port (instead of buttons) >>for input. > >Yep. > >While we're back to the subject of IR remote controls, does anyone know of a >source for the IR transmitter/receiver chip set so that I can make my own >system similar to the ones used in audio/TV devices? They have to be cheap, >as they're so ubiquitous. If it's a serial digital signal you want to transmit, it would probably be easier to use frequency-shift keying using a 555 timer IC as the transmitter, and and a 567 tone decoder as the receiver. In one of Radio Shack's new line of project mini-books, there is a transmitter/receiver pair of that type. I think it is in the optoelectronics book. Plessy Semiconductors makes a chip that is intended to be used in TV/VCR infrared remote control units. The MV500 IC is the transmitter, and the MV601 is the corresponding receiver. These and lots of other neat hacker chips are described in Plessy's "Satellite, Cable, & TV IC Handbook." The book is free for the asking. Plessy Semiconductors, 1500 Green Hills Road, Scotts Valley, CA, (408) 438-5576. National Semiconductor makes a remote control transmitter/receiver IC pair that can transmit up to six channels of analog or digital data. These chips are intended to be used in radio-controlled toys, but they can be used as infrared devices as well. LM1871 is the transmitter, and LM1872 is the receiver. They run about $1.50 each in single quantities. These chips are described in National's "Linear Databook 3," available for about $10 from most major electronics retailers, or free for the asking from your friend National sales rep (I don't understand it either). Ross Oliver Technical Support The Santa Cruz Operation, Inc.