cable lenght meter

Hi everyone

İ need a cable lenght meter but i dont have any idea about how can i do it ?

it need to measure the length of the non-powered cable and display the coordinates and cable length online. ( it will worked by GSM)
it will be able to do the measurement at regular intervals or when I want.

i want to see online For example:

Cable Number :2 Lenght: 445,3m coordinate : 49.015577, 5.710104 Time : 03:22 PM

is there someone who can help me ?

I think you mean GPS not GSM. An arduino bot with a GPS and GSM shield such 32U4 should get the job done.

If you wanna discuss details please PM.

i want to work it online. i think it need to GSM ?

Cable length is tricky. As far as I know there is 2 methods that can be used:

  • Capacitance
  • Transmission delay

Capacitance will depend on the wire size and I think is better suited for small distance.

Transmission delay should be pretty accurate, but only for long distance. Maybe it would work on small distance but we are talking nanoseconds so I don't think an Arduino running at 16MHz would be able to do that.

Both would depend on the wire gauge and material. and Both would require a device to be plugged at the other end of the cable.

You would need a very specialized and sensitive circuit to perform this. An Arduino alone can not do that.

that device don't need to require a device to be plugged at the other end of the cable.

if ardunio cant do what can i use for that ?

That device uses TDR. And the device costs around 1600$USD...