TallyMan wrote:
What do mood rings work on? Is it finger temperature? Can't see them being very useful / accurate for anything other than decoration / amusement.
Mood Rings change color in relation to their temperature.
Some people's temperature increases when they're angry or libidinous, and drops when they're relaxed or asleep.
But some people have poor circulation in their hands, so an accurate indication of temperature can not be had by a ring on a finger.
I built an Arduino device that measured body heat and translated the temperature into PWM signals that drove red, green, and blue LEDs.
This simulated the operation of a mood ring.
There is nothing "magical" about it.
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