simplest way to switch a laser on and off

Forum 2005-2010 (read only) Hardware Interfacing
1

I purchased one of the lasers from Seeed Studio - what's going to be the easiest way for me to control it with the Arduino?

(on and off)

2

It looks like those lasers should work fine at 5V and within the 20mA output of the Arduino, so you should be able to hook it up to ground, and an output pin, then just drive the pin high to turn it on, and low to turn it off.