Suggestions on replacing a bike speed magnetic sensor

[potroveio]

Hi,

I have a bike speed meter which uses a magnet at the wheel and a glass encapsulated metal contact to make short circuits, which will be then counted as pulses at the computer.

This sensor is now broken. I've tested the computer with a new speed meter sensor and it's working nicely.

Would you have any suggestions on how could I assemble a similar sensor at home, or maybe create another of my own, preferentially not battery-powered?

many thanks,
Martin

[hammy]

Replace like with like - that is a Reed switch , usually very reliable

There may be a fault with that wiring ? .

[potroveio]

thanks, Hammy, that might be a solution!

• no, not the wiring... I even tested with a magnet to check if it shorted at the solder joints, but it didn't

[Paul_KD7HB]

@potroveio

create another of my own, preferentially not battery-powered?

please explain! What would it do if no power?

You might look into mechanical speed sensors. In the 1940-50s, there were bicycle speed sensors that counted the wheel spokes as they moved and indicated on a device, same as an automobile speedometer.

[Paul_B]

Hey, it's a reed switch.

Cheap, and the perfect choice for the application. Available in different sizes.

You do still need to de-bounce it in code.