Colorimeter LED Board ver B (led not included)
Easily change the measurement wavelength in your colorimeter with this LED Board. This PCB can be used to mount one 5 mm through-hole LED of your choice. The PCB comes with a pre-mounted 4-pin connector plus an additional laser-cut acrylic mounting plate with hardware. All you need to supply is your choice of LED and resistor.
The pin spacing for the LED is 0.1" and the hole diameter for the pins is 0.032". When used with the colorimeter the LED is connected to the Arduino DIO pin that is normally associated with the blue channel of the colorimeter. When this pin is high it will be at 5V and when low it will be at 0V. You should select a current limiting resistor for operating your LED from a 5V supply. Sparkfun has a nice tutorial on how to do this given the specs for your LED https://www.sparkfun.com/