AVR-Chat

I have used sensors from SIE Sensorik to read liquid level through a  
plastic wall.  They are easy to use, can be calibrated for sensitivity  
and are very reliable.
On Jan 13, 2009, at 5:43 PM, Enki wrote:

>
> 	I need to measure the liquid level inside a transparent plastic
> bottle. I need to know when the liquid is below half bottle height and
> when the bottle is almost empty. Just two steps.
> 	The plastic bottle measures 12cm high x 8cm x 3cm.
> 	I'm not allowed to insert any probe in the bottle.
> 	There are four bottles side by side.
>
> 	I was thinking on metal plates mounted on each side of each bottle
> and using the capacitance method.
>
> 	Or a B&W video camera and some processing. I could generate four
> sample windows on each video line and integrate the samples. The four
> integrated signals would represent the liquid level on each bottle.
> 	An ATMEGA48 would do the level measurement with four ADCs.
>
> 	Comments, please.
>
> 	Thanks,
> 	Mark Jordan
>
>
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