Type of measurement/signal

Other Hardware Sensors
1

Hi,
I want to use a float switch (like on the picture) to measure a filling livel. What kind of signal is to expect (4-20 mA?) and how can i readout or implement the signal with an arduino?
Thanks in advance.
BR, Svenja

IMG_4451
IMG_44511125×996 91 KB

2

You would have to study the specifications/datasheet of the particular part you're using - it's impossible to guess just by looking at a random photo.

A switch is just a switch - it is either open or closed.

3

They all contain reed switches that are operated by the magnet in the slider. You will have to discover either by documentation or by testing, where the switch is located in the tube.

4

All i got was just the tool, there was no datasheet…
Its not a switch, youre right. It seems to measure stepless, because the associated display i received gives out percent and i have seen many different values. The display, thats works together with the sensor, is really slow. It needs a few minutes to show the new value when the filling level was changed. Now it seems like, without the datasheet its not possible to read it out myself.

5

Take a DMM and make some measurments.

6

They are just magnetically operated reed switches.

You can configure them to be either normally open, or normally closed by removing the circlip at the end of the tube and inverting the float.
The magnet inside the float is offset from the centre line of the float.

Google image search finds this: Liquid float switch water level sensor level switch 45mm- 1000mm

7

Does the display have make/model/part number?

Can you please post some images of the display unit, from front and back to show terminal connections.

How many wires/connections does the sensor have, can you post some images of the terminating end?

Can you please tell us your electronics, programming, arduino, hardware experience?

Is this a school/college/university project?

Thanks.. Tom... :smiley: :+1: :coffee: :australia:

8

Its my own project for my van and my first steps with arduino as a process engineer😁 so not much experience, just a few small projects.

IMG_4461
IMG_44611397×4032 1.11 MB

IMG_4457
IMG_44573024×4032 2.21 MB

IMG_4455
IMG_44553024×4032 2.1 MB

IMG_4456
IMG_44563024×4032 2.12 MB

9

svenis, your photographs that you posted in post #8 do not look like the item shown in post #1.

Can you provide us with a link to the items that you actually have

10

Hi,

From the eBay site;
image

52mm 2 In 1 Car Gauge Water Level Gauge Sewage Level Meter Gauge with Alram

Feature:

  • 52mm diameter Two in One Gauge show with easy installation

  • Programmable Input Resistance Ohm Signal to adapt different fuel /water/temperature sensor

  • 0-190Ω, 0-180Ω, 10-180Ω, 240-33Ω, 240-30Ω

  • High Resolution View under sunshine

  • Installation Diameter: 52mm (2inch)

  • Reverse polarity protection and anti-fogging performance

  • Working Voltage:12V/24V

  • Working temperatures: - 40 to 85°C

  • IP66 Waterproof

  • Water level gauge alarm set: less than 20%

  • Sewage level gauge alarm set: more than 80%

Gauge Connection:

  • Black line connect to the negative line,

  • Red line connect to the positive line,

  • Green line connect to the water level sensor signal line,

  • White line connect to the sewage level sensor signal line,

  • Yellow line is exchange button line

https://hz.aliexpress.com/i/1005005398334057.html

Tom... :smiley: :+1: :coffee: :australia:

1 Like
12

I have the ones in (post 8, the ones that TomGeorge posted. There are different ohm values, the ones you posted. How can i read them out with the Arduino? When i can do that, i can just implemtent a simple map/formula in the programm. Thank you for the helpful support so far.

13

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.