650nm 80mW Red Dot Laser Projector HLM1845

Description

What it is

The HLM1845 laser projector is a device that emits a bright red dot, used in various fields such as electronics and experimentation. It is ideal for measurement and visualization applications.

Features

• Wavelength: 650nm
• Power: 80mW
• Projector Type: Red Dot

What it is for

The HLM1845 laser projector is particularly useful for makers and Arduino enthusiasts who want to create navigation or laser projection systems. It can be integrated into DIY projects, for example to create a laser navigation system that projects red dots on a wall to indicate position.

Tutorial: How to Use HLM1845 Laser Projector

The HLM1845 laser projector is a versatile device that emits a bright red dot, ideal for measurement and visualization applications. It is particularly useful for makers and Arduino enthusiasts who want to create navigation or laser projection systems.

What you need

• Arduino Uno
• USB B connector
• 220 Ohm resistor

Steps

1. Connect the laser projector to pin 9 of the Arduino using a 220 Ohm resistor to limit the current.
2. Download and install the Arduino IDE on a computer.
3. Open the Arduino IDE and create a new sketch.
4. Insert the code provided in the ‘code’ section.
5. Compile the program and upload it to your Arduino.
6. Check that the laser projector turns on when a HIGH signal is sent to pin 9.
7. If necessary, modify the code to control other pins or add features such as timing.
8. Explore further possible uses of the laser projector in more advanced projects.

Example code

const int ledPin = 9; 

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

void loop() {
digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);} 

Mini project

Create a simple laser navigation system that projects red dots on a wall to indicate position.

Common mistakes

• Using a resistor that is too small can damage the projector.
• Do not connect the projector directly to a power supply without limiting the current.
• Ignore safety precautions regarding eye protection when working with lasers.
• Configure the projector pin incorrectly in the Arduino code.

Recommended accessories

• Variable resistors
• PWM control module
• Infrared sensors
• Arduino Nano

Frequently asked questions

Can the laser damage the eyes?
Yes, 650nm is dangerous for the eyes. Use appropriate protection.

How far can the red dot be seen?
Visibility depends on the brightness and ambient lighting conditions. Check the datasheet.