Hall Effect Sensor With BASIC stamp

Inevitinably

I'm interested in modifying a personal portable humidifier using a Hall Effect Sensor and a BASIC stamp. Instead of using the plastic reservoir that comes with the humidifier I want to be able to use a gallon jug of distilled water. When the machine is turned on, if the hall effect sensor senses that the a gallon bottle is present it will prevent humidification from occurring. The machine will only begin to humidify if it is turned on and no bottle is detected as being present.

I'd also like to have the stamp be able to turn off the humidifier 24 hours after a bottle has been placed in the humidifier. So it would need some sort of internal countdown.

Does anyone have any suggestions should go about doing this? Or can point me in the direction of some source code.

Thank you!!!

dandreae

I'm not sure about the Hall effect sensor in this case?·· However, you can use a DS102 Real Time Clock with 32.768 KHz crystal.· The DS1302 will give you an accurate time base.· Here is a link for more information:

http://www.parallax.com/Store/Components/IntegratedCircuits/TimeMathCoprocessors/tabid/617/CategoryID/82/List/0/SortField/0/Level/a/ProductID/233/Default.aspx

You may be able to use a Ping sensor or infrared LED and receiver to detect an object.· Here is a link for more information:

http://www.parallax.com/Store/Sensors/ObjectDetection/tabid/176/CategoryID/51/List/0/Level/a/Default.aspx?SortField=ProductName,ProductName

There are sample programs and wiring diagrams for the BASIC Stamp 2 located on each product page.

Dave










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Dave Andreae

Parallax Tech Support·

Inevitinably

Thank you so much!

Would you perchance know how to turn on and off an AC load that is approximately 1 amp using the Basic stamp.

dandreae

You can use a ULN2803 line driver chip connected to the BASIC Stamp with·a relay that switches your load.· Digi-Key, Mouser, and Jameco carry a wide variety of relays.· Here is a link for the ULN2803:·

http://www.parallax.com/Store/Microcontrollers/BASICStampModules/tabid/134/txtSearch/500-00005/List/1/ProductID/211/Default.aspx?SortField=ProductName%2cProductName

There is a Nuts & Volts article listed on the product page. ·This will show you how to connect up a relay with sample code.



Dave

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Dave Andreae

Parallax Tech Support·