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Working life: more than 2000 hours
Spot mode: dot facula, continuous output
Laser wavelength: 650nm (red)
Copper head diameter: 6mm
Light power: <5mW
Supply voltage: 5V DC
Operating current: <40mA
Operating temperature: -36℃ ~ 65℃
Power lead length: 120mm
Shell material: brass
weight: 1g
Laser Diodes are current driven devices and require a current limiting control circuit to ensures that a significant temperature increase will not destroy the laser.
A simple circuit using a LM317 Voltage regulator can be used to current limit the laser.
constant current small laser driver circuit using a LM317
and can even be modulated to 1 MHz or more with any waveform
Another type of laser diode incorporates a photodiode to give feedback to regulate the power, this type of combination allows the use of the laser to be modulated using a Pulsed laser diode driver.
Laser Diode Driver iC-WKN
using a LM317 can even be modulated to 1 MHz or more with any waveform
Project
Multi Laser Diode detector
Using different frequencies to modulate each laser the detectors can decode which laser was used.
Information can also be added by pulsing the lasers
Modulator
A simple solution using a 555 timer IC or other oscillator circuit can be used to modulate the laser at the desired frequency.
A more sophisticated solution using a inexpensive 8 pin micro controller IC can be programed, that can easily be programed to include additional information using pulse code modulation.
Receiver
Phototransistors or Light Dependent Resistors (LDR) can be used for detectors.
LDR can detected lower frequencies so are less flexible.
Photo transistors can operate at high frequencies.
The output from the detector can be amplified and filtered before being passed onto a decoder(s)
A simple phase lock loop IC can be used to detect the desired incoming signal but one is needed for each frequency.
A cheap microcontroller IC (around £1) can be programmed to decode the various frequencies used and can set an output pin corresponding to the laser modulation received and can also decode any pulse coded information as well.
Using a small cheap micro development board with WiFi could then forward the information to a computer.
For example D1 mini board with WiFi (£3.50 including P&P)
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