Monday, June 29, 2009

433MHz RF remote control system for RC Cars

After the 2 weeks of continues development we finally design suitable RC remote control system for cars. This RC system has,

  • Battery eliminator circuit (BEC)
  • Control System
  • 433MHz transmitter and receiver module
  • Motor driver and servo controller

In this design both transmitter and receiver modules are based on seeed studio’s 433MHz RF link kit and control systems are based on microchip’s PIC16F84A MCU.

At the design time we test this circuit with Futaba, Airtronics, JR-Radios, HiTec and "Mystery" (available in eBay) micro-servo units. This circuit may support standard electric motors (brushed DC motors) and during the testing stages we drive RC helicopter motors and RC airplane motors successfully with this system. To drive this circuit we use 7.2V 500mAh Li-Po batter pack.

During the circuit assembling and testing, make sure to take necessary actions (e.g: shielding) to prevent/minimize the EM interferences which was generated by the motors. Most of the time these EM noises may reduce the performances of the 433MHz receiver module.

To get the maximum performance use 830mm (or higher) telescopic antenna with the transmitter and 20cm antenna with the receiver.

We design this system for RC cars but it can also use with RC airplanes, helicopters and boats with some minor modifications to the receiver module.

All the circuit diagrams and MCU source codes are available to download at here.
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