5mW 650nm Red Dot Laser Module

This compact laser module emits a bright red dot at a wavelength of 650nm, with an output power of 5mW. Designed for industrial alignment, positioning, and embedded electronics applications, it features an adjustable focus mechanism and operates on a 5V DC supply.

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Specifications

Parameter	Value
Wavelength	650nm (Red)
Output Power	5mW (Class IIIa)
Operating Voltage	DC 3V–5V
Operating Current	<40mA
Beam Shape	Dot
Focus Adjustment	Yes (via front lens ring)
Emitting Angle	Approx. 120°
Lens Material	Plastic
Housing Material	Brass
Dimensions	12mm (Diameter) x 35mm (Length)
Power Cord Length	135mm
Operating Temperature	-10°C to +40°C
Weight	Approx. 20g

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Pinout and Wiring

The module is equipped with two wires for power connection:

Wire Colour	Function
Red	VCC (3V–5V DC)
Blue	GND (0V)

Note: Ensure correct polarity when connecting to a power source to prevent damage to the module.

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Usage Instructions

1. Power Connection: Connect the red wire to a 3V–5V DC power supply and the blue wire to ground.
2. Focus Adjustment: Rotate the front lens ring to adjust the focus of the laser dot. Fine-tune until the desired dot size and sharpness are achieved at the target distance.
3. Mounting: Secure the module using appropriate holders or mounts to ensure stability during operation.

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Integration with Microcontrollers

This laser module can be directly interfaced with microcontrollers such as Arduino, provided the current draw does not exceed the microcontroller’s output capabilities.

// Example: Blinking the laser using Arduino
const int laserPin = 7;

void setup() {
  pinMode(laserPin, OUTPUT);
}

void loop() {
  digitalWrite(laserPin, HIGH); // Turn laser on
  delay(1000);                  // Wait for 1 second
  digitalWrite(laserPin, LOW);  // Turn laser off
  delay(1000);                  // Wait for 1 second
}

Note: If the laser module requires more current than the microcontroller can provide, use a transistor or relay to switch the laser on and off.

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Safety Precautions

• This is a Class IIIa laser product. Avoid direct eye exposure to the laser beam.
• Do not point the laser at reflective surfaces to prevent unintended reflections.
• Use appropriate laser safety goggles if necessary.
• Keep out of reach of children.

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Troubleshooting

Issue	Possible Cause	Solution
Laser does not emit	Incorrect wiring or insufficient power supply	Verify connections and ensure power supply provides 3V–5V DC
Weak or blurry dot	Focus not adjusted properly	Rotate the front lens ring to achieve desired focus
Module overheating	Prolonged continuous operation	Allow the module to cool down between uses

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Frequently Asked Questions (FAQs)

Q: Can I use this laser module outdoors?

A: Yes, but ensure the module is protected from moisture and extreme temperatures.

Q: Is the laser dot visible in daylight?

A: The 5mW red laser dot is visible in low to moderate lighting conditions. Visibility may be reduced in bright daylight.

Q: Can I power this module with a battery?

A: Yes, a 3V–5V DC battery source can be used, ensuring it can supply sufficient current (<40mA).

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Maintenance

• Keep the lens clean and free from dust or debris.
• Store the module in a dry environment to prevent corrosion.
• Periodically check connections and wiring for signs of wear or damage.

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Note: Always handle laser modules with care and adhere to safety guidelines to prevent injury or damage.

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