Radio control device for 12 commands. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio control equipment
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The device is designed to control 12 different loads. Moreover, up to 8 buttons (PORTB) or 4 buttons (PORTA) can be pressed simultaneously and in any combination. It can be part of, for example, a radio-controlled complex for cars and aircraft models, garage door controls, etc.
The operation of the receiving part is provided in two modes. Real-time mode and command latching (depends on the position of jumper S on the receiver board). If the jumper is removed, the commands will be latched. If the jumper is set, the commands will only be executed while the corresponding button(s) is held down.
Command execution indicators - LEDs. Of course, gates of powerful field-effect transistors or bases of bipolar transistors can be connected to the corresponding outputs of the processor through current-limiting resistors.
Transmitter
(click to enlarge)
The transmitting part consists of a master oscillator and a power amplifier.
MO is a classical SAW resonator circuit with 100% amplitude modulation.
UM - standard with a common emitter, loaded on a quarter-wave piece of wire 16 cm long through a matching capacitance.
The encoder is PIC 16 F 628 A, it processes information about the pressed buttons, encoding and sending bursts of control pulses, as well as turning on the LED indicator and power amplifier during code transmission.
Receiver
(click to enlarge)
Super regenerator.
With the ratings indicated on the diagram and serviceable parts, it has 100% repeatability.
Its setting consists only in moving apart the turns of the loop coil and selecting the coupling capacitance with the antenna. The 3rd output of the decoder controller serves to control the passage of the signal during tuning (software-connected output of the internal comparator). You can control it using a conventional ULF.
Receiver decoder - PIC 16 F 628 A, it decodes and executes received commands.
The encoder - decoder system can work both by wire and with other receivers and transmitters . Each parcel 0 and 1 from the side of the encoder is "painted over" with 5,5 kHz oscillations for better noise immunity + transmission of the checksum.
The power supply of the receiver is mandatory from a stabilized source of 5 volts (not shown in the diagram, the board provides a 5 A ROLL + diode). The transmitter is powered by 3,6 volts but not more than 5,5 volts (the board has a ROLL 5A + diode).
The picture of the pressed buttons in PORTB (pins 6 - 13) on the transmitting part is completely reflected on the receiving part in PORTB (pins 6 - 13), respectively. Picture of pressed buttons in PORTA (3>2, 4> 15,15> 16, 16> 17).
For firmware contact the author.
Author: Sergey, Kremenchug, 8-050-942-35-95 or by mail: blaze @ vizit - net . com; Publication: cxem.net
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