Joystick Dendy - remote control panel. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Joystick Dendy - remote control panel. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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Sometimes it is necessary to have a remote control panel for the device. If the number of buttons on it is large, then to reduce the number of wires in the connecting cable, the remote control is equipped with an encoder, and the device with a decoder. The task can be simplified if you use a ready-made remote control with an encoder - a joystick from the once popular Dendy game consoles. These joysticks contain eight buttons (buttons "Turbo" are not taken into account) and have five conductors in the cable.

Information about the interface between the joystick and the game console is known (see, for example, S. Golubev's note "Repair of the Dandy joystick in Radio", 1996, No. 6, p. 46). Information about the pressed buttons of the joystick is transmitted in serial format with using a clock signal from a controlled device.To synchronize with it, the joystick has an input "Synchro" to which a short pulse with a high logic level is applied after each cycle of receiving data from the joystick.

The proposed device, the diagram of which is shown in the figure, is a decoder that converts joystick signals into logic levels corresponding to the buttons pressed. It consists of a pulse generator on the elements DD1.1, DD1.2, counter DD2, shift register DD3 and storage register DD4. The counter serves to generate a clock pulse designed to set the joystick logic to its initial state.

Joystick Dendy - remote control

In the initial state (after the formation of the "Synchro" signal), the counter DD2 is reset, the joystick outputs the state of the first button ("A") via the data line. The data from the joystick is fed to the serial input of the register DD3. The generator pulses on the elements DD1.1 and DD1.2 information is shifted (toward B7) register DD3. On the decay of pulses of negative polarity at the output of the element DD1.3, the joystick changes its state and provides information about the next button. Simultaneously with the shift of information register DD3 increases the value in the counter DD2. After polling the last button ("Right"), the outputs of the DD3 register contain information about all the buttons of the joystick. In this case, the R2C2 circuit generates a short pulse that resets the counter DD2 and writes information from DD3 to the storage register DD4. From the output of the repeater on the element DD1.4, the synchronization pulse is applied to the joystick and resets it. After that, the whole cycle is repeated.

The generator on the elements DD1.1 and DD1.2 generates clock pulses with a frequency of approximately 1 kHz, which corresponds to polling the joystick buttons every 8 ms.

Depending on the joystick connector, a DB-1M or DB-15M computer socket is used as XS9 (the pin numbering of the latter is indicated in brackets). The decoder and joystick are powered from a stabilized +5 V voltage source. The device, assembled from serviceable parts and without errors, does not require adjustment.

Author: S.Kuleshov, Kurgan

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