This is a solid sensor, with good range and reliable switching. The LED light is very handy for setup! It does NOT interface smoothly with 3 or 5 Volt logic level inputs. Yes, its a pull down type sensor, but "down" isn't particularly close to ground. If you want to run it into a FIRST Robotics control system (RoboRio) or an Arduino you need to use an optocoupler to match up the signals. Also, it will NOT run on 5 Volts. 12 Volts works just fine.

I have a rodent live trap that is for racoon sized animals. I was trying to capture a small rabbit that was eating my flowers. The rodent trap trip plate was not sensitive enough for the rabbit, so I used this sensor to make it electronic.

The M18 Infrared Photoelectric Switch Sensor NPN NO is a compact and affordable sensor that packs a punch in terms of functionality and versatility. Whether you're a 3D printing enthusiast, a robotics hobbyist, or a tinkerer looking to automate tasks, this sensor is a reliable and valuable tool.Key Features and Performance:Accurate Detection: The sensor utilizes infrared light to detect the presence or absence of an object, providing accurate and reliable feedback. It performs exceptionally well on metallic surfaces, as demonstrated by its successful implementation on a steel 3D printer bed.Non-Contact Operation: The sensor's non-contact nature ensures it won't interfere with the operation of your 3D printer or other devices, making it a safe and convenient option for various applications.Wide Voltage Range: The sensor operates within a wide voltage range (typically 6-36V DC), making it compatible with various power sources and electronics projects.Easy Installation: The sensor features a standard M18 threaded housing, allowing easy mounting and integration into your projects. Its compact size makes it ideal for applications where space is limited.Versatile Applications: While it excels in 3D printing bed leveling, this sensor has many potential uses, including object detection, counting, automation, and robotics projects.Pros:Accurate and Reliable: The sensor's precise and consistent detection capabilities ensure reliable performance in various applications.Non-Contact Operation: The sensor's non-contact nature makes it safe and suitable for use with delicate or moving parts.Wide Voltage Range: The sensor's compatibility with various voltage levels makes it versatile for projects.Easy Installation: The threaded housing and compact size facilitate easy integration into your setup.Affordable: This sensor offers excellent value for its price, making it an attractive option for hobbyists and makers on a budget.Cons:Not Suitable for Glass Surfaces: The sensor's infrared technology is not effective on transparent or highlyreflective surfaces like glass.Limited Documentation: Some users may find the included documentation lacking detail, requiring additional research or experimentation for specific applications.Overall Impression:The M18 Infrared Photoelectric Switch Sensor NPN NO is a surprisingly versatile and reliable sensor that exceeds expectations given its affordable price point. Its accurate detection, non-contact operation, and wide voltage range make it valuable for various projects. While it may not be suitable for glass surfaces, and the documentation could be improved, its overall performance and versatility make it a worthwhile addition to any maker's toolkit.Recommendation:If you're looking for an affordable, reliable, and versatile sensor for your 3D printer, robotics projects, or other automation tasks, the M18 Infrared Photoelectric Switch Sensor NPN NO is highly recommended. Its ease of use, accurate detection, and wide range of applications make it a valuable tool for beginners and experienced users. Just be aware of its limitations with glass surfaces and be prepared to do additional research for specific applications.

I was able to power it, line it up and it works just great. Only drawback is I am old and reading the markings on the item was a bit hard. A nice printed sheet of directions would have been nice.But it works well, so not really a problem if your eyes are okay.