AVR-Chat

On 15 Jan 2009 at 10:43, David VanHorn wrote:

> On Tue, Jan 13, 2009 at 8:43 PM, Enki <enkitec@gmail.com> 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.
> 
> Is the liquid transparent, opaque, or uncontrolled?
> If transparent, you can use the lensing effect. Shine a light source
> through a bottle and observe what happens.
> If opaque, then the liquid would block a beam.
> 


	The liquid is printer ink, four colors. The four bottles are closed 
top & bottom, transparent plastic, and mounted togheter. They are spaced 
half a milimeter each. I'm not allowed to insert anything in the 
bottles.
	But I can insert copper plates between the bottles and measure the 
capacitance. Maybe that will do.
	I can also experiment with four IR beams, one for each bottle.
	I can not measure weight because the four bottles are mounted 
together. Ultrasonic seems not to be simple to do.

	Thanks for the ideas. I liked the Sensorik sensors. Have to ask for 
samples ;-)

	P.S.: this is not a homework, it is a project for a potential 
client. If my design works, they buy it.

	Mark Jordan



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