Liquid Level Sensor that can be used in Arduino that is cheaper?

Please teach me how to use Liquid Level Sensor that can be used in Arduino.

Not only found those of the following URL in Japan.

Is there a Liquid Level Sensor that can be used in Arduino that is cheaper?

Not enough information. What are the conditions in which you want to sense liquid level? - Scotty

Thank you for your reply.

I want to measure the change in the water level every day at the lake.

And I want to tweet the change in water level automatically.

To inform the person who is fishing in the lake.

want to measure the change in the water level every day at the lake.

Still not enough information.

What degree of accuracy?
What is the range of levels do you want to measure over?

All these make a difference to the answer.

I use ultrasonic sensor to measure water level in a container. perhaps you can use the same concept.

http://web1.reefcentral.com/forums/showpost.php?p=21868291

I built a soil moisture sensor by placing two parallel metal rods in the soil, and using the resistance between them as half of a voltage divider. Then use an Arduino analogRead to read a voltage, which in my case was related to soil moisture.

In your case, the two rods would extend below the water to a level that would never be out of the water. Water rising on the rods would vary the resistance between them linearly. You might also need a control, two similar rods entirely underwater, of fixed length. The measurement across those would allow you to continuously calibrate your measurement rods.

If you try this, I'd like to hear about the results. Good luck.

I have not actually tried using 2 pcs of metal in water, but I think that will result in electrolysis and corrosion of the metal.

doughboy:
I have not actually tried using 2 pcs of metal in water, but I think that will result in electrolysis and corrosion of the metal.

You are quite correct in that concern - which is why any such circuit uses capacitors (not electrolytic) in series with each of the electrode leads.

Mr Mike
Thank you for your Reply.

Performance is ±15inch.

Water depth of the lake is located 12m

Mr Doughboy
Thank you for your reply.

I saw the link destination.

very cool.

I go to buy a ultrasonic sensor.

I was surprised to The water level I can be measured by ultrasonic sensor.

I have not actually tried using 2 pcs of metal in water, but I think that will result in electrolysis and corrosion of the metal.

I think so too.

I'm sorry for my poor English.

I will let you know when it is try.

Mr Jrdoner
Thank you for your reply.

Is it something like this ?

But I do not know how to use in the Arduino Check the resistance value from the two electrodes.

Do you know a ready-made product that can be used in the Arduino?

Mr Doughboy

I bought a ultrasonic sensor in Akihabara.

I have tried immediately.

It was measured by putting water into cup.

It was successful.

It is possible to cheaply measure changes in water level in this.

Thank you from Fukushima Japan.