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3D printed smart cap can sense spoiled milk
A new 3D printed \"smart cap\" can now help you know if the milk delivered to you is fresh or not, says a study. The 3D printed cap for a milk carton, which has wireless electronic sensors embedded in it, can detect signs of spoilage in the milk. The new technology is a step in the direction when you can check your food using your smartphone, researchers said.
New York: A new 3D printed "smart cap" can now help you know if the milk delivered to you is fresh or not, says a study. The 3D printed cap for a milk carton, which has wireless electronic sensors embedded in it, can detect signs of spoilage in the milk. The new technology is a step in the direction when you can check your food using your smartphone, researchers said.
The researchers integrated the electronic components into a plastic milk carton cap to monitor signs of spoilage. The "smart cap" was fitted with a capacitor and an inductor to form a resonant circuit. A quick flip of the carton allowed a bit of milk to get trapped in the cap's capacitor gap, and the entire carton was then left unopened at room temperature for 36 hours.
The circuit could detect the changes in electrical signals that accompany increased levels of bacteria. The property of milk changes gradually as it degrades, leading to variations in its electrical characteristics. Those changes were detected wirelessly using the smart cap, which found that the peak vibration frequency of the room temperature milk dropped by 4.3 per cent after 36 hours. In comparison, a carton of milk kept in refrigeration saw a relatively minor 0.12 per cent shift in frequency over the same time period.
