Thursday, 22 November 2012
CONTROL ANY DEVICE WITH BLUETOOTH+INTERNET+MAGIC OF CR!CKED
So Ready for some hardcore stuff??
The circuit of a simple cellphone-based device-control system
using Bluetooth communication link and microcontroller is shown above. It can
be easily designed by engineering students and hobbyists. The advantage of Bluetooth
technology is that it doesn’t require line-of-sight for signal transmission
from the transmitter to the receiver. This device control system overcomes the
problems of manual switching (on/off) of different devices through Bluetooth -enabled
cellphone communicating with the Bluetooth module interfaced with the microcontroller .
It is a simple and cost-effective design to solve the problem of remote control
for whatever reason it May be .The circuit consists of a cellphone attached to
a Bluetooth adapter (one could use a cellphone having inbuilt Bluetooth) ,a Bluetooth
module interfaced with microcontroller
AT89C2051,a driver IC ULN2803, five 12V relays, LEDs and associated discrete
components .At the heart of the circuit is microcontroller IC AT89C2051 (IC1).
It is a 20-pin, 8-bit microcontroller with 2kB of Flash programmable and erasable
read-only memory (PEROM), 128bytes of RAM, 15 input/output lines ,two 16-bit
timers/counters, a five-vector two-level interrupt architecture, a duplex
serial port, a precision analogue comparator, on-chip oscillator and clock
circuitry. The ULN2803 (IC2) consists of eight npn Darlington-connected transistors,
which are ideally suitable for interfacing between low-logic-level digital
circuitry and the higher current/voltage requirement circuits such as lamps,
fans or other similar loads fora broad range of computer, industrial and
consumer applications. It is used here for driving the devices through relay
contacts. You can write a simple software program for the microcontroller of
the Bluetooth-enabled cellphone, employing simple coding and decoding of remote
signals to perform switching of devices.
SOURCE:Electronics for you magazine
By Nikhil M Guzar
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