RF Remote Control with 3 Channels by PIC12F509

Figure 1 

The circuit utilizes an 8-pin single chip microcontroller PIC12F509 that is used mostly for low pin count applications with 1K word flash memory and 41 bytes SRAM while having some features like power saving sleep mode and wake-up from sleep on pin change.
An ultra small wireless transmitter TLP434 is being employed by the RF transmitter module with a frequency of 433.92 MHz. This is ideal for data transfers to a remote object and remote control projects. Using a 12V battery, the circuit can reach 200 m with a fitted antenna. The preferred voltage on this device is 3 V although it can accommodate 2 V to 12 V.
The receiver is using a compact radio receiver (RF) RLP434A which directly performs with the TLP434A transmitter in similar frequency. Applications such as robots usually choose this type of receiver where the robot directly receives the commands excluding the hard-wired connection. The typical effective current is 4.5mA which is suitable for data rates until 4.8 KHz.
The life of the battery can be extended by reducing the standby power and putting the microcontroller into sleep mode and wake up on every pressed key.

Source:coolcircuit.com/project/rf_remote/index.html

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