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Features:
brand new and high quality. These are great modules for sensor projects. These modules have 5V working voltage, 5mW power.
Small size and light weight, convenient to use.
There are total four pieces of modules in one set that you may use for many projects.
Specifications:
Power: 5mW
Wavelength: 650nm
Color: Red
Working Voltage: 5V
Size: 1.5×2.8cm/0.59×1.1in
Quantity: 4pcs
Weight: 3g(approx.)
Package Includes:
4 × Modules
CD
Reviewed in the United States on August 9, 2023
I got the YWBL-WH kit for a laser project I am working on in the lab. These are small but powerful laser transmitter modules. Since there was no documentation, I had to read other helpful reviews and figured out how to wire it up. They work as advertised and I heeded the warnings and wore protective glasses while working with these modules.
Posigrade
Reviewed in the United States on July 23, 2023
All four of mine work. I have no way to measure their optical output power, but they seem to be about as bright as I'd expect from a red laser pointer. All four seem well focused. I consider documentation a vital part of any product, but especially so with electronics like this- and there's none. Due to lack of documentation I had to check everything out, and here is what I found:There are three pins. One is marked -, one is not marked, and one is marked S. 5V on S and 0V on - makes the laser work. The middle pin (unmarked) is connected to a 10K resistor which goes to ground. That's all, I have absolutely no idea why it's there. I can't find anything else it's connected to. The pin seems to do nothing at all.The laser diode has a 2.3V drop. There is a 90 ohm resistor on the side of the laser itself for current limiting. Current draw is 30mA, meaning it will need a FET or transistor if you're trying to run it from a GPIO pin from Arduino or RPi.If you want to run this at 3v3 instead of 5V there are a couple options. The 90 ohm resistor (the one on the side of the laser, not the one on the board) could in theory be replaced with a 33 ohm. I have not tried this, so run your own calculations and understand it's a risk to the module. Or just run it as-is, it does operate at 3v3 but it's fairly dim. Current draw as-is at 3v3 is about 13mA with the stock 90 ohm resistor, and will be 30mA with a 33 ohm.
Adrian Mccarthy
Reviewed in the United States on December 15, 2021
[EDITED to correct information about the three pins]I haven't found a datasheet, but this works mostly as I expected.You supply 5 volts to the 'S' pin and connect the '-' (minus) pin to your ground. As far as I can tell, the middle pin does nothing.If you pulse the laser at a specific frequency, then a receiver could look for that frequency and thus filter out any other light sources. You can use pulse-width modulation (PWM) to change the apparent brightness of the dot.At 5 volts, I measured the modules drawing about 25 mA. They also seem to work down to 3.3 volts, where they draw only 9 mA. Obviously, the dot is dimmer at lower voltages.I haven't had time to try all four modules yet, but the first two have worked fine right out of the package.Remember that a 5 mW laser is Class 3 territory. Do not look directly into the laser, do not point it at people or animals, do not shine it into the night sky (which can be very dangerous for pilots), and do not point it at cameras.
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