Alberto Smulders wrote:

> Hi Rick !!!
>
> Another very interested person here, looking for a cheap method to measure
> contents in grain and oil storage bins - should be a kind of ultrasonic
> rangefinder, maximum range around 10...12 meters, ruggedized for use in an
> industrial environment, some serial communication means for rather long
> distance (up to 1 km or so) if possible with unique address for
> interrogation, and.... (hmmm... am I asking too much ????)

I don't thinks so Alberto.

There are commercial unit available in SA. At work I had one that was for
industrial (mining) use. Range was more than 30metres (me tinks). Output was
industry standard 4-20mA output. Get one. Run 4-20mA through a resistor and
measure with a ADC & PIC. Transmit via one of many serial protocolli.....

Cheers!

--
Eric van Es               | Cape Town, South Africa
mailto:vanes@ilink.nis.za | http://www.nis.za/~vanes
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