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Close-up of the assembled P161002 board with Microchip devices in SMD packages Board visualisation with an STM32 microcontroller, SD card socket and GPS module Three-dimensional visualisation of a board with a relay, buzzer and connectors Part of a schematic with an INA326 instrumentation amplifier and MCP3304 A/D converter Three-dimensional visualisation of a densely populated communication module board Device front panel with labelled buttons, volume knobs and a speaker Technical drawing of the front panel showing the layout of buttons and knobs Assembled board with a PIC18F2550 microcontroller, USB socket and trimmer potentiometers TouchGFX interface source code for STM32 in the Visual Studio Code editor Printed circuit board layout with copper layers and component placement
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Remote control over a telephone line

Remote switching and restarting over a telephone line.

Telephone line remote control unit - front view

Telephone line remote control unit - rear view

Fig. The device.

The device is intended for switching up to two appliances on and off over an analogue telephone line using DTMF codes, and for control through commands sent over a serial interface. Either a USB port or RS485 can serve as that serial interface. The port is also used to configure the behaviour of the device.

Two relays rated at 2 A / 120 V AC and 2 A / 24 V DC are used as the switching elements. The switched voltage is at most 24 V DC or 125 V AC. Screw terminals are provided for connecting the controlled signals.

Output relays rated 2 A / 120 V AC and 2 A / 24 V DC

Fig. The controller and the available connectors.

Applications:
1. Remote restart of network equipment.
2. Remote lighting control.
3. Remote starting of network or access services on servers.
Among other things the module works with the RGBW LED controller.

Schematic of the telephone line remote control unit

Fig. Example connection diagram.

Inside the telephone controller with the DTMF decoder

Fig. And this is what is inside the enclosure.


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