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Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 107
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108 TWELVE-CHANNEL RADIO REMOTE CONTROL SYSTEM
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Our 12-channel remote control system revolves around two basic building blocks: a transmitter and a receiver. The transmitter section begins with an Abacom RT5 AM data transmitter. This low-cost transmitter measures about 1 in square and consumes only 4 mA. The range of the RT5 transmitter is about 70 m. This transmitter uses thick-film hybrid technology and requires no adjustments. You simply have to choose the correct matching frequency for the transmitter and receiver. This easy-to-use transmitter module sports four pinouts, which are shown in Fig. 8-1. The transmitter is powered from a 5-Vdc power supply at pin 1. Ground is applied to pin 2 and data input is coupled to pin 6. A quarter-wave vertical or half-wave dipole antenna can be connected to pin 7. The transmitter module is driven by the keyboard encoder chip at U2, illustrated in Fig. 8-2. The keyboard encoder is a Katbrd IBM AT keyboard to RS-232 serial converter kit, available from ham radio operator K1EL, and is shown in App. 1 on the CD-ROM. The Katbrd encoder is an 8-pin specially programmed PIC. A standard PS/2 keyboard is fed to a chassis-mounted keyboard jack at J1. The keyboard jack is supplied with 5 V at pin 5, while ground is applied to pin 2. The two active lines are the CLK, or clock, signal at pin 1 of J1 and the data signal at pin 3. The keyboard encoder can operate at two baud rates, i.e., 9600 and 1200. When pin 4 is high, 9600 baud is selected; when pin 4 is low, 1200 baud is selected. The output sensing at pin 6 is used to configure either true high marking or true low marking output. This pin allows maximum flexibility in interfacing the keyboard encoder to a transmitter or microprocessor. A reset output presents a low true reset pulse when CTL, ALT, and DELETE are pressed together. Pin 2 of the keyboard encoder was not utilized in our project.
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Figure 8-1 AM data receiver.
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A 5-V regulator at U1 is used to provide a stable 5-V power source for the keyboard encoder and the RT5 transmitter module. A 9-V transistor radio battery or a 12-V rechargeable gel-cell battery could be used to power the transmitter board, which can be charged from a small wall wart power supply. The transmitter board can be built on a small PC board or perfboard. The prototype was constructed on a 2- by 3-in PC board. When constructing the transmitter/encoder circuit, it is advisable to install an integrated circuit socket for the encoder chip. Pay particular attention, when installing the keyboard encoder, to orient the chip correctly in the IC socket. The encoder chip will have a notch on the top center or a small circle on the upper left corner, which denotes the top of the IC. Be careful to observe the correct polarity when installing the capacitors and the transmitter module. The keyboard encoder, transmitter module, and regulator will fit into a small metal enclosure. An aluminum chassis box is recommended, so the transmitter will not be affected by external electrical noise or hand capacitance. The entire circuit board is dwarfed by the keyboard connector soldered at one edge of the transmitter board. An RCA jack or pin jack can be installed on the enclosure in order to connect up the external antenna. An SPST slide switch or a mini toggle switch could be used to apply power to the regulator chip. Last, you will need to construct an antenna for the transmitter board. You can elect to construct either a quarter-wave vertical antenna or a half-wave horizontal dipole antenna for your transmitter. Be sure to ground the encoder and transmitter to the antenna ground. A quarter-wave antenna for 418 MHz is about 17 cm long. A quarter-wave vertical antenna is referenced against the ground plane of the transmitter and circuit board ground as shown in Fig. 8-3. If you construct a half-wave dipole antenna, you will need to reference one side of the dipole to circuit ground as depicted in Fig. 8-4. Note that if you construct a vertical antenna for the transmitter, you will need to construct a vertical antenna for the receiver; conversely, if you elect to build a dipole antenna for the transmitter, you will have to build a dipole for the receiver. It is important to have the same antenna polarization to transfer the maximum RF energy between the transmitter and receiver.
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