07-08-2012, 01:36 PM
IR REMOTE SWITCH
[attachment=30370]
Imagine the convenience of selecting
TV channels using your remote and
then pointing the same remote to your
switchboard to switch on/off the fan or
the tubelight. Here is a simple circuit to
remotely switch on/off any electrical device
through a relay using the normal TV/
VCR/VCP/VCD remote control unit. It
works up to a distance of about 10 metres.
The circuit is built around a 3-pin IR
IC receiver (Siemens SFH-506-38 or equivalent)
that can detect 38kHz burst frequency
generated by a TV remote. (This IR receiver
module has been covered earlier in
many projects published in EFY.)
The output pin of IR sensor goes low
when it detects IR light, triggering the
monostable (1-second) built around timer
NE555. The output of the mono toggles
the J-K flip flop, whose Q output drives
the relay through SL100 npn transistor (T1).
LED2, LED3, and LED4 are used to
display the status of each output stage during
circuit operation. Back-EMF diode D5
is used for protection. Transistor T1 is configured
as an open-collector output device
to drive the relay rated at 12V DC.
The circuit draws the power from voltage
regulator 7805.
[attachment=30370]
Imagine the convenience of selecting
TV channels using your remote and
then pointing the same remote to your
switchboard to switch on/off the fan or
the tubelight. Here is a simple circuit to
remotely switch on/off any electrical device
through a relay using the normal TV/
VCR/VCP/VCD remote control unit. It
works up to a distance of about 10 metres.
The circuit is built around a 3-pin IR
IC receiver (Siemens SFH-506-38 or equivalent)
that can detect 38kHz burst frequency
generated by a TV remote. (This IR receiver
module has been covered earlier in
many projects published in EFY.)
The output pin of IR sensor goes low
when it detects IR light, triggering the
monostable (1-second) built around timer
NE555. The output of the mono toggles
the J-K flip flop, whose Q output drives
the relay through SL100 npn transistor (T1).
LED2, LED3, and LED4 are used to
display the status of each output stage during
circuit operation. Back-EMF diode D5
is used for protection. Transistor T1 is configured
as an open-collector output device
to drive the relay rated at 12V DC.
The circuit draws the power from voltage
regulator 7805.