piclist 1998\11\12\130854a >
Thread: IR barrier and sunlight
picon face BY : Peter L. Peres email (remove spam text)

On Thu, 12 Nov 1998, Tjaart van der Walt wrote:

> Use two diodes. Point one at the LED, and the other away from the LED.
> Use an opamp to get the difference between the two signals.

Better, pulse the transmitter and use an AC amplifier for read-out. Unless
the sun goes nova soon there should be no problems (but don't allow the
phototransistor to be saturated with sunlight in any case).



In reply to: <364A6AB7.613A6598@wasp.co.za>
See also: www.piclist.com/techref/io/irs.htm?key=ir
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