RF Transmitter

[milestag]

EDIT: Okay, now I have looked at your code and see your problem. The problem is that you are not using "PicBasicPro". So you are in the wrong FORUM.... good luck.



Just curious...If you are already using a PIC, then why add a Holtek chip to your data path? Why not use SerOut and SerIn, and eliminate the Holtek chip altogether. Or write your own serial routines if you need manchester encoding or whatever.

If I remember right, the Holtek chips have to send the data repeatedly (maybe 5 times?), and has to receive it 3 times. That's alot of overhead for data transmission. Unless you are only sending single byte commands?

As far as the address pins, they just have to be set the same on both chips. Usually with dip switches. Get a copy of the Holtek datasheets. They are pretty detailed with example circuits.

[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........