Remote control device for 12 commands of increased power on the microcontroller. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Remote control device for 12 commands of increased power on the microcontroller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio control equipment

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The device is designed to control 12 loads in real time. That is, while the button is held down on the transmitter, the LED on the receiver is lit. Of course, instead of any of the LEDs, an optocoupler or a control electrode of a powerful power bipolar or field-effect transistor, including, for example, the model's engine, can be turned on. Moreover, all 12 buttons can be pressed simultaneously and in any sequence.

Transmitter

The classic scheme on the SAW resonator in the master oscillator, modulated by the controller. Modulation 100% AM.

(click to enlarge)

The power amplifier provides at a load of 50 ohms: 7 volts, which corresponds to 1 watt. The currents of the transistors of the pre-terminal and final stages are 50-75 and 150-200 mA, respectively. All contours must be in screens. The adjustment is made by geometric stretching or compression of the contours marked with an asterisk. Encoder - PIC 16F628A, 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

The receiving part consists of an RF amplifier based on a 2SC3356 transistor, an RFM RX 5002 microassembly (frequency 418 MHz) and an external comparator. An external comparator is used to make it possible to replace the RX 5002 with a conventional super-regenerative stage, which I described earlier. An external comparator digitizes the low-frequency analog signal received by the receiver and digitally feeds it to the input of the command decoder.

(click to enlarge)

Receiver decoder - PIC 16F628A, decodes and executes received commands (only digital input). The encoder-decoder system can work both by wire and with other receivers and transmitters. Stabilizers for 4 volts can be replaced by 5 volts (more common). Just keep in mind that the supply voltage of the RX 5002 should not exceed the nameplate (about 3,5 volts). Quarter-wave lengths of wire are used as antennas.

Controllers were flashed with this programmer and IC Prog.

Download PCB layout files in Sprint Layout format

Remote control device for 12 commands of increased power on the microcontroller. Transmitter photo

Remote control device for 12 commands of increased power on the microcontroller. Receiver photo

For firmware contact the author.

Author: Sergey, Kremenchuk, 8-050-942-35-95, blaze@vizit-net.com, blaze2006@ukr.net; Publication: cxem.net

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