The 5V Red Laser Diode Module (650nm 5mW) is a versatile and compact light source designed for precision signaling and optical experiments. At Electrapac, we recommend this "point" laser for students and makers in Bangladesh who are building laser-based security systems, non-contact tachometers, or interactive light shows with Arduino and ESP32.

This module features a high-quality 650nm red laser diode encased in a protective copper housing. Unlike bare diodes, this module includes an integrated current-limiting resistor and a focusing lens, allowing it to project a sharp, concentrated red dot over long distances. It is designed for low power consumption, making it safe to power directly from a microcontroller's digital pins or a small battery pack.

Key Features for Electrapac Customers

• Adjustable Focus: The copper head can be slightly rotated to fine-tune the laser beam, ensuring a sharp "point" even at distances of several meters.

• Microcontroller Compatible: With a current draw of less than 40mA, you can trigger the laser directly from an Arduino Uno, Mega, or Nano without needing a separate transistor circuit.

• Long Range: Capable of projecting a visible red dot over 15–20 meters in low-light conditions, making it ideal for trip-wire security systems.

• Durable Copper Casing: The metal housing acts as a small heat sink, protecting the delicate laser diode from overheating during extended use.

• Easy Installation: Comes with pre-soldered 2-wire leads (Red for Positive, Blue/Black for Negative) for quick breadboard prototyping.

Connecting the Electrapac Laser Module is simple, but eye safety is paramount:

1. Red Wire: Connect to 5V or a Digital Output Pin.

2. Black/Blue Wire: Connect to GND (Ground).

3. Safety Warning: Never look directly into the laser beam. Even at 5mW, direct eye exposure can cause permanent retinal damage. Never point the laser at aircraft, vehicles, or pets.

4. Heat Management: While the module is rated for 5V, if you plan to keep the laser on for many hours continuously, ensure it is mounted in a way that allows the copper head to dissipate heat.

• Laser Trip-Wire Security: Pairing the laser with a Photoresistor (LDR) to trigger an alarm when someone breaks the beam.

• Optical Communication: Sending simple data pulses over long distances using light instead of wires.

• Scientific Experiments: Demonstrating the principles of reflection, refraction, and light scattering in a classroom setting.

• Laser Pointers: Building custom-housed pointers for presentations or star-gazing.

• Leveling Tools: Creating DIY laser levels for construction or picture hanging.

We source our Red Laser Modules with high-clarity lenses to ensure the beam remains a sharp point rather than a blurry "splatter." Visit us at www.electrapac.com for the optical components that bring precision to your DIY electronics.