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you could make that for 15 dollars worth of parts on a circuit board 1" x 1". Analog output 1-axis accelerometer, 2-channel comparitor. Set the light to turn on when the accelerometer outputs a certain level on accel and decel (one comparitor each), and you're done.
If doesn't have to be "optimal", it just has to be a help for people that care less than your typical EM reader.
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