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This 5V Keyes Laser Module is very easy to use and designed to interface with Arduino. Although it does not require an Arduino to work. It produces a bright red dot visible inside a structure at > 30'. Connect + 5 Volt to the “S” pin and Ground to the “-“pin.
ARDUINO test code:
void setup ()
{
pinMode (13, OUTPUT); / / define the digital output interface 13 feet
}
void loop () {
digitalWrite (13, HIGH); / / open the laser head
delay (1000); / / delay one second
digitalWrite (13, LOW); / / turn off the laser head
delay (1000); / / delay one second
}