Making Furniture Interactive

September 12, 2007

touch

Filed under: Exercise 2: Add a Switch,Greg Saul,Uncategorized — gregsaul @ 3:50 am

title01.jpg

This Light reacts to a person touching it’s surface. Circuit traces printed across the surface of the lamp detect the resistance of the users finger and reacts by brighting or dimming the light.

This circuit uses two transistors in a Darlington pair to detect the slight bit of current that is allowed to run from a circuit trace to ground when a user touches the circuit. The chip then detects whitch circuit trace has been touched and changes the PWM signal on a pin accordingly to dim or brighten the light.

The PWM pin it attached to a large transistor that pulses a 12volt line that is applied to the Halogen bulb. the 5v arduino is just used to turn this transistor on.

check this page for lots of useful information and to find out how a Darlington pair works http://www.kpsec.freeuk.com/trancirc.htm

thumb10.jpgdiagram02.jpgthumb02.jpgthumb01.jpgthumb03.jpgthumb04.jpgthumb05.jpgthumb08.jpgthumb06.jpg

Advertisements

1 Comment »

  1. Hi Greg, what kind of transistor did u use?

    Comment by socialroles — September 29, 2007 @ 10:53 pm | Reply


RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Create a free website or blog at WordPress.com.

%d bloggers like this: