Long wires with sensors and arduino

Other Hardware Sensors
1

my requirement is interfacing the sensor such as wcs1700(current sensor) with arduino here the distance is 10mtrs long so which kind of wire is suitable to avoid noise ,and voltage drop

2

Do you also need to supply power over this cable?

Are you using just the sensor or some module with an amplifier?

3

I don't think that there will be a noticeable voltage drop as long as you use decent wires, the noise could be a problem though. I have done a tiny search on Google, but can't find the used protocol for the output. Is it just analog, or is it some kind of one wire I²C or something? Some other questions:

  • What do you want to make?
  • what is the required resolution?
  • What's the operating voltage (probably +3.3V or +5V, but you never know)
  • What is the power supply?
  • Does the power need to run through the same cables?
  • Do you have any datasheets of the sensor?
  • (you will probably have thought about this one, but) does it really need to be 10m?

If the output is analog, and you need to have a high resolution, is an ADC and shift register a solution? If an ADC and shift register aren't a solution, you'll need to build an array of different capacitors, coils and resistors. Chose the values based on the required voltage (I assume that you're working with +3.3V or +5V?), but if you have a scope to use, measure the noise on the cables to make it more precise. Either way, I would use something pair twisted, the twists eliminate the capacitive effect of the wires.

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4

yes sir through this cable power will be carried . i am just using the sensor only

5

Only if current runs through them does the magnetic effect of the twists counteract the capacitance, and only properly if a couple of MAX485 transceivers (or similar) are used.

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6

I recommend this

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7

That looks like pretty good stuff for the job. btw do you know of any cable with 2 thick power leads and a much thinner 9single or double) data lead ?

8

Close, there will be no voltage drop, because the Arduino pin draws no current from the sensor. No current == no drop.

Must be VCC of the processor used, to preserve ratiometric behaviour of the sensor.

Use twisted or shielded wire for long cable runs.
A 10-100n cap from analogue input to ground, close to the Arduino, could kill any noise.
See page 4 of the datasheet.

The sensor seems almost the same as an ACS712...
Leo..

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