Simple Wireless Communication

[dhouston]

1. Your schematic says RX Module & Receiver but shows the transmitter.

2. Don't forget a 0.1µF bypass capacitor on Vdd.

3. Your question is asked frequently and usually devolves into a long, confused thread. I've put together a very short web page that covers simple wireless communication, including a link to sample PBP code. See...

• http://davehouston.org/RFTipsTricks.htm

[jhorsburgh]

Hi Dave,
I made some changes to the schematic to include the capacitor, ideally what i am trying to do is have the transmitter send a code when SW1 is pushed and if that code is the same as the code in the receiver then the LED is turned on.

I also had a look at your PIC RX-TX code http://davehouston.org/PIC-RX-TX.TXT
can it be adapted to work on a 16F628A?

Thank you very much for your time,
Jeremy

[dhouston]

It should be simple to convert. The example is for an 8-pin PIC so pin designations will differ. I would start by comparing pin designations in the datasheets for the 12F629 and the PIC you want to use. Also, the example assumes an internal 4MHz oscillator. If you use a different oscillator frequency you need to adjust the values used with PulsIn/PulsOut accordingly. See the PBP manual entries for these commands.

You are still showing a 4-pin module as the receiver. The receiver has 8 pins. The datasheet for your receiver indicates its output for Logic HI is 0.7Vdd (3.5V with Vdd=5V). Table 17.4 of the PIC16F628A datasheet indicates that pins with Schmitt Trigger inputs need 0.8*Vdd (4V with Vdd=5V) for Logic HI while pins with TTL inputs only need 2.0V for Logic HI. Tables 5.2 & 5.3 of the PIC16F628A datasheet give the types of input buffers for the pins. I suggest you use a TTL input on Port B.

Also, RA5 is input only so your transmitter circuit isn't going to work as drawn. You need to choose another pin.