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Bench Talk for Design Engineers

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Bench Talk for Design Engineers | The Official Blog of Mouser Electronics


Seeing The Light: A Circuit For Interfacing With Ambient Light Sensors
On November 12, 2014 in All, MultiSIM BLUE by Mike Parks
Mike Parks
We built a smart mailbox, as related in an article, that had an ambient light sensor to detect when the mailbox door was opened. In that project we used a Vishay ambient light sensor (Mouser Part #782-TEPT4400) that acts very much like an NPN transistor, in fact the part is also referred to as a phototransistor. The difference being (when compared to a normal bipolar junction transistor) that instead of needing a base lead to setup the bias voltage, photons provide energy at the base-collector junction to turn the transistor on, thus allowing current flow from collector-to-emitter.
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Tagged With: Ambient Light Sensor, MultiSIM Blue, Op-Amp, phototransistor, Vishay

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