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• n  a transducer used to detect and measure light and other radiations

• The varying combinations cause correspondingly varying pulsations in the photocell.
• The faster the ticking the stronger the light that is reaching the photocell.
• Then the photons were picked up by a sensitive photocell.

• photoelectric cell
• photoconductive cell
• electric eye
• magic eye

News & Articles

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• 'Star Wars' theremin bra: May full support be with you
  It's a bra. It's a theremin. It's R2-D2. Some things just go together like peanut butter and jelly. Like "Star Wars" and theremins and bras. An Instructables member built such an undergarment using LEDs and an Adafruit Flora wearable microprocessor. The bra includes a photocell detector and an ultrasonic range sensor. Wave your hand in front of the bra to affect the sound. It's designed to react ...
  July 8, 2013 - CNET
• May the force - and full support - be with you
  It's a bra. It's a theremin. It's R2-D2. Some things just go together like peanut butter and jelly. Like "Star Wars" and theremins and bras. An Instructables member built such an undergarment using LEDs and an Adafruit Flora wearable microprocessor. The bra includes a photocell detector and an ultrasonic range sensor. Wave your hand in front of the bra to affect the sound. It's designed to react ...
  July 8, 2013 - CNET