RF Transmitter

[Ron Marcus]

What are you trying to accomplish? A contact closure, data transmission, or just a signaling device? I'm in agreement that you can drop the Holtek encoder/ decoders, or get rid of the PIC. The Holteks can be used with buttons, just as the PICs can very easily emulate the Holtek chips. When the 12E is activated, it sends a 12 bit PWM AM word. It repeats this after a small delay until deactivated. The receiver looks for three correct words in a row. The first 8 bits are address, the last 4 are control bits. It is easier to write the code in assembly, due to tight timing, but it can be done in PBP.

[Ioannis]

Look at an earlier post of mine: http://www.picbasic.co.uk/forum/show...79&postcount=6

Ioannis

[et_Fong]

since i am using Microsoft VB to make my interface, so i am using "170" as synchronize signal, "0" as address bit, "0~9" data bit which run certain function. that's why i need to perform the "match" , to read the "0" address bit, which is similar as connect PORT B to ground.
after i send the RF signal, the receiver size will receive and decode the signal to 4 parallel data to PIC16F84A RA0~3, then it will control the movement according to the data receive........