I want to control the following laser module from an arduino digital output:
- Specification V2 – Aug 2010
- Wavelength : 650nm +/-5nm
- Output Power : 4-5mW
- Operating Voltage: V2 = 3.0-4.0V
- Operating Current: 15-20mA
- Operating Temperature: 10 – 40°C
What's the best approach - I've looked at diodes for voltage drops, resistors and regulators but I really don't know which to use. The variability of the voltage and current in the specs is rather confusing.