Here's how you can make your own Smart Coaster which will tell you when it's safe to sip your hot coffee or tea. You'll need a round metal container, simple circuit consisting of a thermistor, a special low-power operational amplifier (op amp) IC, an LED, and a couple of passive components.
Friday, November 28, 2008
Make your own Smart Coaster
Here's how you can make your own Smart Coaster which will tell you when it's safe to sip your hot coffee or tea. You'll need a round metal container, simple circuit consisting of a thermistor, a special low-power operational amplifier (op amp) IC, an LED, and a couple of passive components.
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