Post by thread:[PIC]: infra red transmissionon 16F84

Hello every body I am trying to build an infrared transmitter and receiver working with sony's infrared protocol (SIRC). I am using the Siemens SFH506 decoder?receiver as the receiver for the infrared signal and I am trying to let it trigger the external interrupt on a 16f84, but it does not work. I have set the intedge to trigger on rising edge, and basically has the output of the SFH directly to the portB,0 pin. Any ideas? Thanks Mias Van Vuuren * e-mail : spam_OUTvanvuumTakeThisOuTvodacom.co.za <.....vanvuumKILLspam@spam@vodacom.co.za> -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Mias Van Vuuren wrote > Hello every body > > I am trying to build an infrared transmitter and receiver working with > sony's infrared protocol (SIRC). I am using the Siemens SFH506 > decoder?receiver as the receiver for the infrared signal and I am trying to > let it trigger the external interrupt on a 16f84, but it does not work. I > have set the intedge to trigger on rising edge, and basically has the output > of the SFH directly to the portB,0 pin. > > Any ideas? > Are you getting an output from the SFH506 when you activate the IR Transmitter ? If not then the chances are that the carrier frequency on your IR Transmitter is not matching the filter frequency of the SFH506. Not all systems use 38kHz some use 32,34,36 or 40 kHz and some Japanese equipment uses 56kHz. I presume you are specifying the Sony Infra Red Protocol because you have one of their handsets. As far as I am aware this protocol only defines the pulse train, it does not define a fixed carrier frequency. Measure the frequency out of the transmitter with an infra-red LED connected to the Y input of an oscilloscope regards Chris Carr -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> Measure the frequency out of the transmitter with an infra-red LED > connected to the Y input of an oscilloscope > > regards > > Chris Carr With a 100 ohm resistor across the LED else you won't see anything but slow triangles. Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body