SM-226L-3Q Seco-Larm Overhead Door Mount N.C. Magnetic Contact w/ 3 Wires for N.O./N.C. Applications (One Pack)

10/10 would bang

I needed a way to sense the position of my garage door for my remote garage door controller that I am building. Initially thought I could use a simple tilt switch but found it would be more difficult to implement and too bouncy. This is a pretty forgiving switch and works great with my garage door.

No easy to install with no instructions

Installed and works perfectly. Mounting bracket for the magnet leaves lots of options. I moved the magnet on all three and trimmed the bracket on two. East to make work for my doors. I installed them on the top of the door with the contact on the overhead door opening.

I have not installed this yet but I have tested it. It appears well made and functions as I expected it to. This switch has the ability to control two functions with NO and NC positions. I plan to use this for my garage door to tell if it open or closed (we have been known to leave the door open all night). The two contacts will let me have a red light if the door is open and a green light if it is closed without using a relay in my DIY indicator panel. This also lets me know of any faults because one light will always be on. That makes for the minimum of circuitry in the panel. I also found a magnetic switch with the same function for the man door.

I purchased this to replace a cheap unit on a NexxGarage controller. The magnetic range and quality of this unit is great. It can be configured as NO or NC.

Using as a sensor with a Raspberry Pi. Working perfectly so far. Straightforward install.

It works on my garage door. Now I can tell when it is open. Good Product.

Perfect. Using for my Insteon home automation....they used to include this exact item in their garage door kits but have since cheaped out. I ordered this to match the one Ive had for several years when I wanted to add HA control to my second door.

Great purchase.