[TriEmbed] TriEmbed Digest, Vol 39, Issue 15

[Alex Davis]

> All,  any ideas on a low power (5mA and 3.3-5V) IR beam sensor
> (transmitter
> and reflector) I could use in an outdoor setting?  Need to count
> pedestrians walking on a gravel road and the width - 30' - is too great
> for
> ultrasonic. Ideally, could buy the sensor components directly and
> integrate
> them with my data logger board.

Chip,

looks like this one (https://www.sparkfun.com/products/11724) can be had
in a 10-meter version, and uses 2.9 mA average, so maybe ultrasonic
would work.

I think decent-range beam-break is going to take some decent current.

Alex 

-- 
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