i need to detect a magnetic field. Uptil now I have been using a Hall element 49E OH49E SS49E linear Sensor. It works but the sensitivity is just marginal.
Under no magnetic field, the value read via analogRead is about 545 while the South and North pole are at about 555 and 535. I am worried about noise causing false readings of the magnetic field
I like the 3 pin TO92 style form factor as I can bend the pins as they enter package to 90deg so that the orientation is correct for my application. I would like to stay with that form factor if possible. Based on Mee-n-Mac’s feedback I tried using the smd 1304 package but I have had zero luck dead bug soldering them and don’t have enough room to mount the 1304 to a small board.
Take Care
Ian
What magnetic field strength do you want to detect?
If it is on the order of the Earth’s field strength, you can’t beat a consumer grade magnetometer for the price/performance ratio. See for example https://www.pololu.com/product/2737
Thanks for the suggestions. It brought up some more constraints I am dealing with.
Thhe magnetic strip I am trying to detect is about 1in wide and 1/4in thick. and located about 1.5 in away the the sensor. The sensor needs to fit inside a threaded cylinder that is about 5/16 inside diameter.The end of the cylinder will be passing over the magnetric strip. I need to positively identify that the cylinder is passing over the magnetic strip. I haven’t got the specs of the magnetic strip but it isn’t much stronger than a strong fridge magnet.
A “strong fridge magnetic” will have near field strength 100x-1000x that of the Earth, so TO-92 case Hall sensors are the best choice.
There are lots of varieties of these on the web. I have two, used with small magnets mounted on a rotating pipe.
http://www.ebay.com/itm/New-Hall-Effect … SwrklVWiZF
Nice, ready to use, with built-in LED. Open collector output. 5V
1.5 in. might work with strong enough magets.