Remote control device for loads. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Remote load control device

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Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches

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The device is designed for remote control of loads via telephone line or GSM channels. It connects to a telephone line or to a cell phone that supports AT command control (eg Siemens C35). It is also possible to connect the device to the Lock GSM security system, which allows using a common GSM terminal for both devices. The circuit diagram shows, and the printed circuit board provides elements for the subsequent modernization of the device and ensuring its compatibility with any firmware versions.

Remote load control device

Programming mode. Connect the device in parallel with a telephone connected to the telephone line and in tone mode. Instead of a telephone, you can use any source of DTMF signals - in this case, they must be fed to the DTMF input.

Press the PROG button. At the same time, the LED will light up. Enter a four-digit password. the entry of each digit is confirmed by a beep. The fifth digit determines the number of calls before "auto-pickup" - ie. device activation. After entering the number of calls, the device automatically exits the programming mode.

User mode. Dial the phone number to which the remote control is connected. If dialing is done from a fixed telephone, it must be in tone mode. It is also possible to dial a number in pulse mode, however, after dialing a number, you must switch to tone mode to enter a password and control loads. It can also be controlled from any cell phone.

After passing the number of calls programmed by the user, the device will connect to the line (GSM channel) and the user must enter a four-digit password. If the password is entered incorrectly, the device will turn off. If the input is correct, the user enters the load management menu. Buttons 1-4 select the appropriate load channel. Further pressing of the symbol "*" the device turns on. To turn off, the desired channel is again selected and the "#" symbol is pressed. When channel 5 is selected, all loads are controlled simultaneously. After finishing work, you must double-click the "#" symbol. In this case, the device is disconnected from the line and returns to its original state.

Audible alarm (firmware version 1.0)
Programming input confirmation - high frequency double tone
password prompt - high frequency triple tone
Password confirmation - high frequency triple tone
Password incorrect - low frequency triple tone
Correct channel selection (1-5) - high frequency single tone
Wrong channel selection - single low frequency tone
Load on - high frequency double tone
Load disconnected - low frequency double tone
End of work - low frequency triple tone

Archive can be downloaded hence.

DU_PRINT - view from printed conductors and SMD components
DU_VID - view from the part side
DU_PHOTO - photomask.

Be careful! The photomask is superimposed on the board with the printed side!

DU_shema.sdd - schematic diagram in Schemagee editor

For more details, see the site ock.3dn.ru.

Publication: radioradar.net

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