need HELP. please.

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cissy.christine

New Member

• Jul 8, 2011

• #1

our group is working on our electives. we are asked to create a liquor and metal detector for a turnstile.

can someone, please, help us.

thank you~!

 

SABorn

New Member

• Jul 8, 2011

• #2

Is the liquor to be detected before or after consumption.

 

cr0sh

Member

• Jul 8, 2011

• #3

@SABorn: Obviously, it was meant to be consumed before the design of the sensor!

 

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colin55

Well-Known Member

• Jul 8, 2011

• #4

If you can detect liquor, you will be a millionaire. Thousands of people have tried and failed.

 

Last edited: Jul 11, 2011

crutschow

Well-Known Member

Most Helpful Member

• Jul 8, 2011

• #5

They're called Airport Scanners. But they ain't cheap.

 

Last edited: Jul 8, 2011

J

Jaguarjoe

Member

• Jul 8, 2011

• #6

Is this what you are looking for:

https://www.futurlec.com/Alcohol_Sensor.shtml

 

SABorn

New Member

• Jul 8, 2011

• #7

I thought "buy a dog" but then where do you stick the battery pack?

One would imagine any sensor that could sniff out alcohol would be false triggered by perfumes and deoderants etc that are alcohol based.

 

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cissy.christine

New Member

• Jul 11, 2011

• #8

we are thinking of MQ2 sensors. can we use it to detect the presence of alcohol?

 

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colin55

Well-Known Member

• Jul 11, 2011

• #9

You are asked to detect the illegal importation of spirits. This is not "alcohol detection."

 

J

Jaguarjoe

Member

• Jul 11, 2011

• #10

According to the datasheets, an MQ2 will work fine but it does not appear to be as sensitive as the MQ3 (200ppm vs 0.1mg/l). Both cost the same, so take your pick. I don't know the details of your circuit, but the gasoline vapor detector I made using a Futurlec MQx worked pretty good, a stable power supply for the hogish heater, lots of DC gain, an 8 pin uC to convert DC to "geiger counter" pips and a 386 to drive a small speaker. I don't recall the details of the heater supply so it couldn't be very fancy. They take a while to warm up and a DC zeroing pot came in handy.

 

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cissy.christine

New Member

• Jul 12, 2011

• #11

Jaguarjoe said:

According to the datasheets, an MQ2 will work fine but it does not appear to be as sensitive as the MQ3 (200ppm vs 0.1mg/l). Both cost the same, so take your pick. I don't know the details of your circuit, but the gasoline vapor detector I made using a Futurlec MQx worked pretty good, a stable power supply for the hogish heater, lots of DC gain, an 8 pin uC to convert DC to "geiger counter" pips and a 386 to drive a small speaker. I don't recall the details of the heater supply so it couldn't be very fancy. They take a while to warm up and a DC zeroing pot came in handy.

Click to expand...

MQ3 sensor? what is the difference between MQ3 and MQ2 ? is there a major difference?

 

J

Jaguarjoe

Member

• Jul 12, 2011

• #12

The MQ3 is designed for alcohol testing:

https://www.futurlec.com/Alcohol_Sensor.shtml

They also have a high accuracy alcohol sensor but it's twice as expensive.

 

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cissy.christine

New Member

• Jul 14, 2011

• #13

how about metal detectors? my prof comes up with another request . he's asking for metal detector.
can you please suggest the best metal sensor. please. thanks.

and im wondering how we will connect our sensor to our turnstile. any ideas? thanks thanks