Created by
Created January 20, 2013
Last modified January 20, 2013
Tags arduino   laser   npn-transistor  


How to hookup a laser module to an Arduino, using an NPN transistor to control it.

Calculation, based on 20mA typical operating current draw from the laser module.

Ic = 20mA = 0.020A
Ib = Ic/10 = 0.002A
Rb = Vs/Ib = 5/0.002 = 2500 Ohm

Laser module I used:


Not provided.


Thx for the info. Did you used the arduino 5 volt or an external power source?

by Geyst
February 27, 2013

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