650nm Laser Diode Module for Arduino (Works with Official Arduino Boards)

Pros: Cheap and ready soldered laser.

Cons: Laser is not so bright. Can not be seen good after like 4 meters. The spot seems a bit scraggy.

Other: I don't know yet for what I will use my laser, but I think every (mad) scientist should have at least one laser.

Pros: This laser LED looks similar to SKU 133778, rated to be 5 mW. To operate with a 5V power supply, a series resistor is required. I used a series resistor of 1.2kOhhm, resulting in 2V over the laser and a current of 2.5mA, resulting in 5 mW power dissipation. Connect grounding to the pin marked with a "-". Connect the 1.2KOhm resistor to the pin marked with a "S". Connect other side of the 1.2kOhm resistor to the +5V power supply.

Cons: Had to bend wires between circuit board and laser module to eliminate the short circuit.

Other: When using proper series resistor works fine. Needs focusing of the lens.

Pros: Very cheep. Easy to connect. 5v supply easy to integrate in a circuit. Good pointer dot. Does not get hot. Does its job xD. Very good for microprocessor interfacing. Low power.

Cons: Laser pointer not aligned properly with pcb and the dot is not a straight line. Pcb contact and wiring are all bare, can be easily short circuited.

Other: If you need a cheep laser device this is way better than building the whole circuit for a laser diode, which in 99.9% of the cases would result in a higher price, more complicated design, more components and more time... more money... so BUY IT

Pros: It's cheap, easy to connect and use, you don't need any resistant or so, it don't get hot.

Cons: I don't find one so far. Others said it can be easyli short circuited, but I don't have that problem.

Other: I have used it for several projects, and it was working fine. Later, if I need more lasers, I will definietly order from this one.