I'm trying to build a speedometer for my motorcycle using an Arduino and I'm not sure whether to use a reed switch or a Hall sensor. The sensing distance is about 5-10 cm (the distance between the wheel and the sensor / switch). The only sensor I can get is a 3144 one (that's all the information I got about it...)
Is the distance too great for sensing? It only needs to check if the magnet is around the sensor, nothing more.
Hall sensor may be best; most are designed to be robust. Many have threads or mounting brackets to make it easier to attach to your system like this:
https://www.digikey.com/catalog/en/partgroup/gt1-series-hall-effect-gear-tooth-sensors/13172
As mentioned before, if you use magnets instead of detecting the metal passing by from a gear tooth or something, you can extend the range.
Reed switches rely on mechanical motion to send a pulse meaning some form of wear. They aren't designed to handle fast switching action over long periods of time.
A reed switch is not generally a good choice in a high vibration environment. Shocks may cause undesired closing of the switch. You could explore anti-vibration mounting, but it's basically the wrong solution.
A Hall effect sensor makes more sense here. 5cm is not too great a distance, finding magnets strong enough shouldn't be a problem.
You need more information than a partial part number to use a part properly. You're probably referring to the A3144. Google it and you'll find datasheets. The part seems to have been discontinued, by the way.
