Specifications
The KY-008 Laser transmitter module consists of a 650nm red laser diode head and a resistor. Handle with caution, do not look directly into the laser head.
Operating Voltage | 5V |
Output Power | 5mW |
Wavelength | 650nm |
Operating Current | less than 40mA |
Working Temperature | -10°C ~ 40°C [14°F to 104°F] |
Dimensions | 18.5mm x 15mm [0.728in x 0.591in] |
KY-008 Connection Diagram
Connect signal (S) to pin 13 on the Arduino and ground (-) to GND. Middle pin is not used.

Example Code
This Arduino sketch will repeatedly turn on and off the laser head every second.
int laserPin = 13;
void setup() {
pinMode(laserPin, OUTPUT); // Define the digital output interface pin 13
}
void loop() {
digitalWrite(laserPin, HIGH); // Open the laser head
delay(1000); // Delay one second
digitalWrite(laserPin, LOW); // Close the laser head
delay(1000);
}
KY-008 Related Products
Hot Deals from AliExpress
I need to know the cost ?
Hi, you can get the KY-008 for less than a dollar on aliexpress or amazon.
Where can I find all the specifications to this module? (i.e. beam divergence, beam power density, etc.)
Hi Arduino Modules, please help me to figure out the durability of the KY-008 Laser transmitter module. Thank you so much.
Please kindly inform me of the maximum duration (how many hours) of the KY-008 laser transmitter and the maximum distance the signal from the transmitter can reach the receiver.
Thank you very much.
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Great article! finally an answer to the mysterious middle pin.