On 19/06/2011 01:00, IVP wrote:
>> I wish to drive a IR LED at 40khz
> BTW, you can use a 555 (or any gated oscillator) to do most
> of the work
>
> http://home.clear.net.nz/pages/joecolquitt/irtx2.gif
>
> It (a) modulates your data with 40kHz, so you simply supply the
> 0s and 1s, and (b) has much better current capability (+/-300mA)
> than a PIC pin
>
> Joe

I've used 555 gated by PC serial port handshake pin for IR remote=20
transmitter. Very hard to do 38KHz in PC SW in application program, you=20
need a device driver.

A very small series resistor needed to get sufficient range.

But doing the 38KHz with Manchester Encoding is easy on a PIC with a=20
timer interrupt. I'd use a bipolar transistor though.
--=20
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