Gadget Freak Case #118: Spying on Your Freezer

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Can we get the PIC code as well?......

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-- Design News, April 7, 2008

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William Grill wanted to make sure his freezer didn’t cut out and ruin his frozen food. He was concerned that when he traveled, his food could defrost and re-freeze — thus compromising his frozen steaks — without his knowledge. So, he developed a gadget that measures freezer temperatures, keeps a history of variance and sends an alarm if freezer temperatures rise above a set range. The gadget is built around a small controller, an alarm and a temperature sensor. While temperature monitors are common, Grill’s device remembers temperature variance and displays the length of time the freezer rises above the set temp. The gadget is relatively small and costs less than a couple of steaks bought on sale and stored in the freezer.

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Amt	Part Description
1	AA Battery	729-5173
1	Battery Holder	839-3059
1	Momontary	676-5056
1	50K Ω R Single Turn Pot	754-1238
2	470K Ω R CF1/4	832-1825
1	820 Ω R CF1/4	832-0343
1	82K Ω CF1/4	832-0703
1	LED	782-0030
1	Controller	383-0284
1	Black 2.75 x 4.6 Enclosure	278-0571
1	PiezoAlarm	623-2024
1	.1sq Perf Board/as needed, Copper Clad both sides with solderable pads	977-0088
Additional parts required:
1 Temp Detector
1 Wire
Get build instructions and complete parts list

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Talkback Comments on this Story

	Can we get the PIC code as well?...... more >>
	Posted by: Dan Smith 5/12/2008 2:45:08 PM PT
	I'm a big fan of the ice cube metho...... more >>
	Posted by: Jerry Steele 5/6/2008 1:42:39 PM PT
	I would just like a simple device t...... more >>
	Posted by: Chris Nicholson 5/2/2008 9:32:46 PM PT
	I the same problem with the freezer...... more >>
	Posted by: Jeff 4/28/2008 11:54:54 AM PT

See all comments >>

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Gadget Freak Case #118: Spying on Your Freezer

-- Design News, April 7, 2008

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