Ky-008 Laser transmitter module

The KY-008 is a small laser diode module that emits red laser light (~650 nm).

It’s commonly used with Arduino, ESP32, Raspberry Pi, or other microcontrollers for:

Optical sensors and switches

Line-following or obstacle detection

Laser pointers or alignment tools

DIY communication experiments (light-based signaling)

The module is super easy to interface: just 5 V power + digital output pin from a microcontroller.

✨ Key Features

✅ Red laser diode (~650 nm wavelength)
✅ Operates at 5 V DC
✅ Low current consumption (~20 mA typical)
✅ Digital input control → ON/OFF via microcontroller
✅ Compact size (~20 mm × 14 mm)
✅ Arduino-compatible
✅ TTL logic level control

📊 Electrical Specifications
Parameter Value
Operating voltage 5 V DC
Operating current 20 mA typical
Laser type Red, 650 nm wavelength
Power output ~5 mW (class II)
Control input Digital TTL (0/5 V)
Beam angle ~5°
Dimensions ~20 mm × 14 mm
Operating temp 0 °C – 50 °C
🔌 Pin Configuration (3 pins typical)
Pin Function
VCC +5 V
GND Ground
Signal (S) Digital input → HIGH turns laser ON

💡 Tip: Some KY-008 modules label pins as VCC / GND / IN.

⚙️ How It Works

Apply 5 V to VCC and GND to GND → powers the laser diode

Send HIGH signal to the signal pin → laser turns ON

Send LOW signal → laser turns OFF

Can be pulsed for signaling or modulated for optical communication

🛠️ Common Applications

Arduino/Raspberry Pi laser experiments

Line-following robots

Laser tripwires or obstacle detectors

Optical communication projects

DIY laser pointer projects

Alignment or leveling tools

💡 Design Tips
✅ Current limiting

Most modules have internal resistors, so no extra resistor needed, but check datasheet for your batch.

✅ Eye safety

Laser is low-power (class II), but avoid direct eye exposure.

✅ Control

Use digital microcontroller pin → can blink, pulse, or modulate signal for experiments.

✅ Quick Summary

KY-008 = compact red laser transmitter module

Perfect when you want:
✔ Low-cost laser for Arduino/Raspberry Pi projects
✔ Digital ON/OFF control
✔ Line-following, obstacle detection, or laser signaling