Radio Frequency - Remote Control

You might have seen people at the park flying a model airplane or blimp, or controlling a miniature boat sailing serenely across a pond. You might wonder how this works. This kind of devices use radio controlling.The operation principle of the radio control is that the transmitter sends a control signal to the receiver using radio waves. The control signals are sent in some suitable coded form (many different codes for different uses exist). Besides remote controlled toys radio controlling can be used in very many other applications when some remote device needs to be controlled without wires. RC toys typically have a small handheld device that includes some type of controls and the radio transmitter. The transmitter sends a signal over a frequency (most RC toys operate at either 27 MHz or 49 MHz) to the receiver in the toy. The majority of RC toys are labeled with the frequency range they operate in. Most full-function controllers form simple have six on/off-type controls. Controllers for more advanced RC systems often use dual joysticks with several levels of response for precise control of RC servo motors in the controlled device.

General information

 

• About.com Guide to Radio Controlled Vehicles 
• Auto Roll 10 Channel RF Remote Control - This ten channel Auto Roll RF Remote Control is virtually impossible to 'crack'. Ten channels that are selectable as either latching or momentary. Each relay has led indicators. Receiver can support up to 15 transmitters. This page has a document that has complete details, including schematic and theory of operation. 
• How RC Works - This document gives view to a typical RC signal transmission. 
• How Radio Controlled Toys Work 
• R/C Web Directory 
• The RC Transmission! - text explains what kind of signals are sent from the TX to the RX of an "FM" radio control set, how they are decoded, and ideas about producing it yourself 

Remote controlling circuits

 

• 433.92 MHz vastaanotinmoduuli - receiver circuit for 433.92 MHz data transmissions, uses ASK modulation, based on T7544 IC, text in Finnish 
• SAW-resonaattorilla toteutettu oskillaattori RF-out 433.9 MHz - This is a RF transmitter oscillator for 433.9 MHz operation, can be modulated (AM) with external signal  
• Four-way remote control uses series transmission - four channel remote controller system which uses 433 MHz band 
• RC Electronics Projects - lots of projects published in the UK magazine Radio Control Models and Electronics 
• 433.92 MHz RF Remote Control - schematics & projects using the TWS/RWS RF modules 
• Remote Control Schematics - Schematics for turning your IR transmitter into an RF transmitter, schematics for 433.92MHz RF transmitter & receiver modules with 4-bit & 8-bit remote control encoder/decoder circuits, 5-button, 4-Bit transmitter schematic for TWS-434 RF transmitter, 4-button, 4-Bit transmitter schematic for the TWS-434 433MHz RF transmitter module with Holtek HT-12E encoder IC, 4-Bit receiver schematic using the RWS-434 433MHz receiver module with Holtek HT-12D decoder IC