I don't think I have schematics for each that use the PIC12F629 but my web page does have schematics of the basic circuits using similar chips (although they may use different pins). See...For the transdmitter, I used a chip with ADC so I can modify the output to signal a low battery. If you are not interested in that, use the PIC12F629 and omit the connection to pin 6. Because I wanted to maximize battery life, the transmitter is powered by the data signal so there is no transmitter drain when idle.

For the receiver circuit you can use a PIC12F675 or the PIC12F683, as shown, if you want to measure received signal strength using an ADC pin (code will need modification). Otherwise, a PIC12F629 is fine.

NOTE: While the code uses a protocol developed about 40 years ago by NEC for IR remote control (TV, etc.), it's being used here for RF (as X-10 has used it for for nearly 40 years). If you want to use it with IR it's a bit different for both transmitting and receiving.