BREAKDOWN OF A REMOTE CONTROL SYSTEM

A remote control system is any system with controls or commands delivered to the main unit from a distance, in this case by way of radio frequency transmission. The remote system we will discuss includes an encoder, transmitter, receiver, and decoder power wheels dirt bike. All of these parts must be used in order to attain a complete link.

See descriptions below. ENCODER: An encoder is a circuit in which a code or signal presented in one format can be changed to a format compatible with the circuitry it interfaces with. In the case of the TX-01 the format delivered by the user is a 12 bit parallel code consisting of 8 address bits and 4 data bits. This code must be changed to a razor mx500 – very cool bike serial format in order to become compatible with the transmitter’s input. This is the job of the TX-01 encoder motherboard, or more specifically, the HT12E encoder IC found on the TX-01 encoder motherboard.

TRANSMITTER: A transmitter is a circuit with an output sent through the air by, sound or electromagnetic waves at a specific frequency. In the case of the TX-99, the output is an amplitude modulated radio frequency of 300MHz. The transmitter receives a coded signal from the encoder and uses that signal to modulate its 300MHz carrier. In simple terms, the output of the transmitter is an electromagnetic representation of the input data code. RECEIVER: A receiver is a circuit capable of accepting and processing light, sound, or electromagnetic waves of a specific frequency dune buggy for kids. In the case of the RE-99, the 300MHz radio frequency signal sent by the transmitter is received, and the incoming data extracted from that signal.

The extracted data is then sent out in serial format to the decoder board. DECODER: A decoder is a circuit in which a coded signal of a specific format (usually that of its compatible encoder) is received and changed to a format compatible with the circuitry it interfaces with (usually the format originally presented to the encoder is the same format used for the output of the decoder when used in wireless systems, but not always). In the case of the RE-01, the incoming code is a 12 bit serial format. This code must be checked to ensure that the first 8 bits (address bits) match the address of the decoder IC. This is the job of the RE-01 decoder motherboard, or more specifically, the HT12D decoder IC found on the RE-01 decoder motherboard. If the incoming 8 bit address is correct, the last 4 bits of the 12 bit code (data bits) are passed on to the data outputs of the RE-01, and the Valid ID relay closes and remains closed until the incoming signal is no longer present. The 4 data bits, however, latch and remain in whatever state they were set to by the last transmission, until they are changed by the next transmission.

DATA CODES: A data code is a set of numbers or letters representing some form of information. In the case of the encoders and decoders described above, the data code consists your kids will just love this dune buggy! of a combination of four 1s and/or 0s representing 16 possible states. If a +5V signal is applied to one of the four data lines, or if the data line is left floating ( not connected ) , this is considered a 1. If +0V (or ground) is applied to one of the four data lines, this is considered a 0. By using different combinations of 1s and 0s on the four data lines, 16 separate control commands can be sent. IC’s are available, such as the 74HC154, which can turn the 4 bit data output of the RE-01 into a more user friendly output, giving you the option to select 1 of 16 different output pins to activate per transmission. If the 4 bit data code is being sent to a micro-controller, or if less than 4 different commands are needed, these extra IC’s are not needed.