The new light sensor

In my last post, I spoke about creating a light sensing “widget” that I could attach to my projects. I used a 10k resistor and was reading the light readings off of the analog pin on Arduino. However, I noticed that attaching an LED to the circuit was throwing the readings way off.

so, I found another way of calculating brightness. I found this article which talked about using a capacitor attached to the photocell which is in turned attached to a digital pin on Arduino. I was able to attach an LED without throwing off my readings a lot. While I was making these modifications, I also decided to make some other improvements (like getting an LED holder to hold my power indicator)

Here’s a pic:

The new light sensor

If you guys are looking for an informative tutorial on how to use a photocell, I found this article very helpful: http://learn.adafruit.com/photocells/using-a-photocell

Author: Moazzam

Moazzam is a software developer working in the big apple. He has over a decade of experience in development. While most of his work involves developing web applications, he does development for Android and Windows Mobile in his spare time.

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