On/Off Infrared Remote Control

Therefore,
the first one you find allows you to turn off the light and enjoy your
movie in the best possible conditions. The infrared receiver part of
our project is entrusted to an integrated receiver (Sony SBX 1620-52)
which has the advantage of costing less than the components required to
make the same function. After being inverted by T1, the pulses
delivered by this receiver trigger IC2a, which is nothing other than a D
flip-flop configured in monostable mode by feeding back its output Q
on its reset input via R4 and C3. The pulse that is produced on the
output Q of IC.2A makes IC.2B change state, which has the effect of
turning on or turning off the LED contained in IC3.

This
circuit is an opto triac with zero-crossing detection which allows our
setup to accomplish switching without noise. It actually triggers the
triac T2 in the anode where the load to be controlled is found. The
selected model allows us to switch up to 3 amperes but nothing should
stop you from using a more powerful triac if this model turns out to be
insufficient for your use. In order to reduce its size and total cost,
the circuit is powered directly from the mains using capacitor C5 which
must be a class X or X2 model rated at 230 volts AC.

This type
of capacitor, called ‘self-healing’, is the only type we should use
today for power supplies that are connected to ground. ‘Traditional’
capacitors, rated at 400 volts, do not really have sufficient safety
guarantees in this area. Considering the fact that the setup is
connected directly to the mains, it must be mounted in a completely
insulated housing. A power outlet model works very well and can easily
be used to inter-space between the grounded wall outlet and that of the
remote control device.

Based on this principle, this setup
reacts to any infrared signal and, as we said before, this makes it
compatible with any remote control. On the other hand, it has a small
disadvantage which is that sometimes it might react to the ‘normal’
utilization of one of these, which could be undesirable. To avoid that,
we advise you to mask the infrared receiver window as much as possible
so that it is necessary to point the remote control in its direction
in order to activate it.