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The implementation of the rc helicopter microcontroller system is developed with a pair of microphones PIC16F628A, and two key radio. The modules of this project are in the transmission medium used. In the trade would get a wide range of radio transmission and reception, with different features such as: cost, scope, methods of modulation and complexity in managing others. For this project we will work with a couple of very simple radios of the top company that produces different solutions in the field of wireless communications. This is a pair of radios which one is the transmitter and the other receiver. References are TLP434A and RLP434A, which are the transmitter and receiver respectively. This game works a radio carrier signal and 434MHz ASK modulated, so that they can transmit logic values 1 and 0. ASK modulation is similar to the modulation of AM commercial radio AM band. In ASK modulation logic 0 is represented by the absence of the carrier signal and logic 1 in the presence of this. Radio of rc helicopter modules, used in this project, have a range of 100 meters if they have a proper installation of the antennas. ASK modulation as AM modulation is extremely prone to interference and noise. It is therefore important to implement within the PIC programming routine to detect when an error has come up with data to be discarded, since no radio modules include any software or hardware method for detecting these errors. The radio modules are able to transmit at 9600 bits per second and to receive a rate of 4800 bits per second but these are extreme cases of the modules. To establish a reliable communication, we will work at a rate of 2400 bits per second. The installation of these rc helicopter modules is very simple. The radio has two pins that are used to power the module, each one with VCC and GND, a pin for the antenna and one for data input or output serially. The transmitter can be powered with a voltage of between 3V and 12V. The transmission power is greater at higher voltage. The receiver module can be powered only 5V. Implementation To establish communication between the PIC USART module work with each of the microphones. This implies that one of them is the transmitter and the other micros receptor. These are known as TX and RX. In TX micro four pins are continually evaluated, which are installed in two separate buttons that are the four bits of information we want to convey. This rc helicopter radio information is packaged and transmitted serially by the USART.
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