Jamshaid said:
I need to know a driver IC for an IR receiver circuit.
There are four switches at the transmitter end. I want to use a single
IR transmitter/receiver to send one signal from one of these switches
at a time. The IC should then be able to activate the right operation
corresponding to that switch.
Hi, Jamshaid. It's a little more complicated than that.
A standard system would have a PIC or other microcontroller on the
transmitting end to read the switches, and convert that into a serial
bitstream. It would then output that digital data on a 38KHz carrier
frequency to an IR LED with a transistor to amplify the current to 20mA
or so.
On the receiving end, you'd have a separate IR receiver module with a
38KHz filter, whose output would go to another PIC or uC to decode the
serial bitstream, and send the output to relays or digital outputs.
The easiest s.e.b. way to do this would be to look at one of the many
kits available. One good choice would be the Velleman K8049 15-channel
digital IR transmitter, and the
K8050 15-channel digital IR receiver with 15 open-collector outputs.
These outputs can be used to drive small relays.
If you look at the docs on these kits, you can see this is exactly the
way the Velleman kit works.
On the transmitter side, you can remove the pressure switch rubber, and
hardwire your momentary switch contacts directly to the board. On the
receiver side, the ULN2803s can directly drive small 5V relays. Hook
one end of the coil to +5V, and the other to the ULN2803 output.
If this doesn't do it for you, possibly you could describe what you
need in more detail.
Cheers
Chris
