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650nm Laser Diode

650nm Laser Diode

SKU SKU Code: # LD01

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This is a 5 mW laser diode module that emits a small intense focused beam of visible red light. The module can be used with an Arduino and photoresistor module to perform basic remote signaling. It is breadboard friendly and low-cost having a wavelength of 650 nm and an operating voltage of 5 V. 
The laser head is composed of a light-emitting tube, condenser lens, and adjustable copper sleeve and it is assembled when delivered, the focal length of the lens is adjusted and glued by a strong glue stick, which can work directly after connecting to a 5 V dc power supply.


The laser diode module works with Arduino together which contains Signal, GND and the middle pin indicates +5 V. The connection between Laser Diode Module and Arduino Uno where signal, GND, +5 V of Laser diode is connected to pin 8, GND, and 5 V respectively. 
Then, download the source code attached here and open it via Arduino software. Choose the correct board and port before uploading the code into the board. Upload the source code into Arduino Uno.


  • Used for DIY or robots
  • Used for all kinds of level meters
  • Part of Spectroscopy
  • In laser test tools
  • In medical equipment positioning
  • Production of signal equipment


This is a low-power laser device however as with all laser devices care should be taken when in use. We should never look directly into its beam or point the laser at another person because doing so may cause permanent eye damage.

Operating Voltage 5 V DC
Output Power 5 mW
Spot mode Dot Facula (continuous output)
Laser wavelength 650nm red-coloured
Operating current <40 mA
Power lead length 120 mm