HC-SR505 sensor very long cable length

Other Hardware Sensors
1

I would like to connect the HC-SR505 sensor to an arduino that is sitting 40-50 meters away.
The Sensor output pin is HIGH when movement is detect.

Can I run 50 meter wire between sensor and the arduino?
The module current drew is 70uA

I calculate the voltage drop of 50 meter 24AWG wire and is about 0.5V. With that in mind - do you see any issues running that length of a wire for that type of sensor?

If it is indeed can raise a problem - what can I do in order to communicate with an arduino sitting 50 meter away?

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2

Run a higher voltage to the end, and put a 5V voltage regulator there.

3

It's not a matter of just the voltage drop. There is also the matter of capacitance of such a long cable.

I would use a driver to amplify the signal to about 12V at the sensor end and then use a potential divider at the Arduino end to bring it back to 5V.

This is a technique we used to use on remote sensors when I worked for an access control company. We could get about 0.5Km length range on the cable.

4

Is the current in the cable 70uA (post#1) or 70mA (in calculation)?

5

I'm sorry, the current of the sensor is 70uA and not as my calculation of 70mA

6

Can you explain what does it mean? perhaps with schematics? I just don't understand this terminology

Run higher voltage to the end of the sensor? do you mean insted of providing the Vcc leg of the sensor with +5V from the arduino I should give it higher voltage such as 12V?

7

what type of an amplify? how do you wire that configuration?
is it for amplify only the signal of the sensor? what does it helping for? higher signal less interfaces ?

8

Sorry, if you don't know the meaning of that, it would be work to explain it to you, especially if I have to draw it. Did you research my suggestion? Like Google "5V regulator circuit"?

Why this way? Can't you put the MCU at the far end, and send some kind of signal back, like via serial?

9

50m should not be a problem. Alarm installations do this all the time.
What is a problem is your wire acting as an aerial, picking up interference that could randomly trigger the Arduino. Alarm wire or wisted pair Cat-5/6 and a 100n cap from D2 to ground could eliminate that.
Leo..

10

Not needed.
It has a built-in 3.3volt regulator, because it runs internall on 3.3volt.
Leo..

11

Well, the specification is 4.5V minimum (from the link that was given).

12

using 12V

13

If there is nothing else at the sensor end, like a LED,
then I calculate a 20km round trip with 24AWG.
Leo..

14

the idea is to run around 16 sensor from the arduino to different places in the nature. (Is that fact change the interfaces that night be? the fact it is not in a complete urban environment )

So in any way most of the sensor will placed far away from the arduino

15

what is an estimate of longest 2 core cable 22/24awg I could run from arduino to the sensor without the need of special more expensive cable ? 20 meter? 30 meter? I run in the past 20 meter cables from arduino to 5mm led and had no issues

16

With a 70uA current draw there is no practical distance limit.
You need three cores (GND, 5volt, data).
You could use 4-core telephone cable (the old stuff for outside).
Leo..

17

Do you mean this type of cable?

that could also work?

18

I would use an opto isolator on the the input too

19

Search for B008X9ZVBS on Amazon.
300ft 4-core copper underground telephone cable.
Leo..

20

why so? do you see the need for isolation the ground of the arduino from the ground of an external psu that will feed the sensor?