10Pcs Reed Switch Normally Open (N/O) Magnetic Induction Switch Electromagnetic for Arduino (Pack of 10) CYT1004

Awesome little switches. I purchased these for a little 3d printed 22re engine. The switches work great near a magnetic field, but be sure to verify they do work. Please be careful, the glass body looks good but break very easily. I broke several while trying to get them into my 3d print and at one point I had a piece of glass go into my eye. This was my fault and not the products, just be careful if you are near sighted like me.

These work exactly as expected. I'm using one to sense a magnet spinning inside a brass tube with the reed switch mounted outside the tube wall. Being of glass, the reed envelope is fragile, while the iron leads are quite stiff. One must take care to not expose the glass envelope to bending forces while forming the leads.

Arrived when predicted, used one to repair a Davis Instruments Vantage Pro 2 weather station rain gauge. These reed switches were WAY MORE sensitive to even the old magnet in the rain counter! The base of the rain collector had to be modified to put more distance between the swinging magnet and the reed switch. I am very pleased with these reed switches and now I have a lifetime supply! They will be WAY easier to replace if the first one goes bad.

It's a reed switch. For low voltage, low current sensing of strong magnetic fields with a predictable orientation, it's fine. That worked in my project.By fragile, I mean merely bending the wires near the glass can cause the glass to break, and this can be annoying. I solder wires at least a half inch from the glass and try to avoid bending them at all.The orientation of the magnet matters. When using a round (like a penny) magnet, I find it works very well when the magnet disc is at right angles to the glass, pretty well at a 45 degree angle, and hardly at all at 0 degrees. Experiment before you commit to an installation. For the neo magnets I used, detection range was over an inch and sometimes closer to 2" or even 3".Debounce time seems to vary. I used 75ms for settling time; lower might work, but it would depend on many factors.

I tried using these for a project with a bad door sensor in my car. I had success with similar switches I pulled out of window/door alert sensors. These stay switched until I tap them or pull the wire off the circuit. They work fine when not in a circuit but that doesn't help me much.

for the most part, the switches seem to be very good. as i have noticed in other reviews, you have to test the switches first when they arrive. of the 10 switches i received, 4 of them did not work properly. i contacted the seller, and they promptly issued a partial refund, which is exactly what i requested. i didn't need all 10, so i couldn't see any reason to return the order and get a replacement. i have already installed the switches that i needed, and they work perfectly. as a side note, not all reed switches have exactly the same magnetic sensitivity, so check all your distances before closing up whatever you are fixing. also, do not assume that a switch isn't working if you install it in the original position. i had to adjust the position of my replacement switch about 1/32" further away from the magnet than from the original.

I have a La Crosse Technologies rain gauge Model: WS-2317Rain that stopped working. An internet search suggested the reed switch. Looking for a replacement reed switch, I bought these. However, I did not pay close attention to the wording of the voltage ratings. It cannot be rated at 300 volts if it breaks down at 150 volts. The seller says it is great for Arduino projects, and last time I checked, Arduino’s voltages were rated in the single digits for voltage inputs. It is my belief that a higher rated voltage reed would require a stronger magnetic force to operate. I installed the switch in about the same position as the original. Like the other reviewers, I have found the switch is more sensitive and stayed picked up (contact closed) from the magnet that passes by the reed when the magnet was in the at rest position. The switch did drop out (contact opened) when moved farther away from the magnet. This told me I needed to a) buy a reed switch of a higher voltage rating from a reputable electronics store that provided a data sheet for the product, or b) shield the switch from the magnet when the magnet was in the at rest position. See drawing in photo 1. The red ink is the shield. Wikipedia suggested an iron-based substance.Caution: When working with sheet metal it is very easy to get cuts from the sharp metal edges and precautions should be taken to prevent injuries.An empty tuna can provided the iron-based metal and was verified with a magnet. With the lid already removed, and the can on its side, the thick lip from the top of the can was hacksawed off half way around the can and then bent away so tin snips could finish removing the lip from the can. Next, a couple of vertical snips about an inch apart allowed for a piece of the side to be bent over and cut off. This piece was too short, but the opening made it very easy to cut a strip of metal from the side of the can (see photo 2). Once the strip was cut from the can, the strip was cut to the correct width so it could be slid down between the supports that held the reed switch printed circuit board. The last thing I did was to put the cut strip of metal partway into the side jaws of a crescent wrench (see photo 3) before pushing on it with a thumb (see photo 4) to put a lip on it to aid in the positioning of the magnetic shield. The shield was installed between the reed switch and the magnet (see photo 5). Once everything was in place, a multimeter was hooked up to the far end of the cable to verify functioning. A couple of readjustments, by sliding the magnetic shield up and down until the sensitivity was optimized, completed the repair. I hooked the rain gauge up to the rain gauge transmitter and confirmed it was adding to the rainfall total (see photo 6). So far all is good. I hope this helps someone.

I'm using them for a 5 volt, 4 mili-amp application. As of this review, it's about 20,000 cycles in with no issues. I'm trying the first one without a capacitor, and it seems to be doing fine. I'm sure it will eventually degrade, and the next one will have a cap. My application is using a stack of neo-mags. The switches are quite sensitive and require some distance. They arrived well packaged, and in good shape.