An inexpensive (£25) pocket sized programmable
computer system that can be used as a web server for wireless remote control of
any 240v device. The single board Arduino (fig 1) has direct access in/out ports
that permits logical connection to the outside world.
Combine this with a Ardunino Ethernet shield compatible
board (Fig 2)(£25)(piggy backed onto the Arduino), an off the shelf, ‘remote
control socket control system’(Fig 3)(£10), and a CMOS 4016 bilateral switch (Fig
4)(£1)(the inter-connection part of the device), we have a web controlled power
socket that can be operated from a smartphone.
The CMOS device replaces the function of the button(s) on
the remote control unit. The trigger for the CMOS switch is derived from the digital
input/output, HI/LOW port state of the Arduino.
The Ethernet shield board provides a direct connect to the
internet and thus a web enabled device, such as a smartphone. A small amount of
soldering, setup, and programming is required for the full operation of the web
based remote control unit however there are many tutorials available for
interfacing the Arduino digital in/out ports to external devices on the
internet.
By Dr M. Jackson (June 2013)
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