Galvanic Skin Response (GSR) sensor

A sensor to measure changes in skin resistance which can be hooked up to an Arduino board. I kept finding partial descriptions of how to make one of these so decided to pull together all the snippets in one place to make life a little easier.

The following circuit is a simple proven design that won't win any awards for accuracy, but it does 'work', with one key limitation in that the contact points tend to corrode if used over long periods of time, though these can easily be refreshed with a quick rub of sandpaper. XHTML 1.0 Strict CSS2 WAI