AVR-Chat

Another option might be a pressure transducer on the bottom of the  
bottle or an ultrasound device bouncing off the water.


On Jan 13, 2009, at 6:24 PM, Tim Gilbert wrote:

> Are the bottles transparent?  If so, you could use a laser and photo  
> diodes; the wavelengths absorbed could even tell you what was in the  
> bottle.
>
> Regards,
>
> Tim Gilbert
> JEM Innovation Inc.
> 303-926-9053 (office)
> 303-437-4342 (cell)
> 720-890-8582 (fax)
> www.jeminnovation.com
> www.pdksolutions.com
>
>  ----- Original Message -----
>  From: Ken Holt
>  To: AVR-Chat@yahoogroups.com
>  Sent: Tuesday, January 13, 2009 7:20 PM
>  Subject: Re: [AVR-Chat] Liquid level measurement
>
>
>  I have used capacitive sensing successfully on a 4' high
>  fiberglass tank, measuring the height of the water inside
>  to within and inch. I used only one metal plate; the water
>  inside was a good enough ground plate.
>
>  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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