RF is truly the best way to remotely control a robot. But RF communications are not for beginners who often stumble on various problems. For example the way you design your boards has a great impact on your signal. Doing it wrong could mean signal deviance. That’s why it’s recommended to use RF boards that come in pair, already assembled. They’re not too expensive and you can avoid allot of trouble.
RF Modem Robotics Project: [Link]
The PIC 16F876A drives a standard LCD module with a HD44780 controller and a resolution of two rows of 16 characters each. The HD44780 requires 8 data lines (port B of the 16F876A) and three control signals: RegisterSelect (RC6), Read/Write (GND) and Enable (RC7). Since the data presented on the 8-bit-wide output port RB0-7 is only written to the HD44780, the R/W input is hardwired to ground (/Write). The LCD back-light LEDs are supplied through two 10ohm current-limiting resistors.
RF-Microwave Frequency Counter: [Link]
This project uses an ATmega16 and a radio control kit to get the job done. You can control up to four servo(motors) with a simple push of a button. The system can also control a servo with a photocell, for example if you enter its range it will turn on a light. Of-course there are a few commercial alternatives but the price is quite high and many of them are not a versatile as this one.
Garage Door Control System (or any device radio controll system): [Download Project] – [View Project PDF]
These days RF capabilities are present in almost all embeded applications and by RF i mean wireless transmission of data. The receiver and transmitter boards (RLP & TLP 315) for this project are cheap RF modules manufactured by Laipac Technologies. The frequency on which the receiver and transmitter pair works is 315 MHz, UHF (Ultra High Frequency) frequency range. The transmitter works from 2 V to 12 V and the receiver from 3.3 V to 6 V, the author supplied it with 5v in his circuit.
DIY Wireless receiver and transmitter: [Link]