user31822: I want to read in the values to an arduino analog input.
The approaches I have been looking at are:
1.) A ultrasonic distance sensor; my concerns are that tehse are not usually waterproof.
2.) A pressure transducer; these tend to be very pricy.
3.) Some kind of level switch which provides digital input (Is water level here: yes/no?)
Would anyone happen to have some advice on what sort of sensor would be good for the application of reading in the tank level and using the information in a sketch?

user20967: There are some ultrasonic sensors that are specifically designed for this very application. I have used something simlar as a water level sensor, and they seem to be reliable. The sensor that I used was from MaxBotix, and had a range of up to 5m, resolution of 1mm, and both analog and serial data output. Interfacing it with an Arduino was very easy.
Have a look at This article for details

31822: <p>I want to read in the values to an arduino analog input.</p>

<p>The approaches I have been looking at are:</p>

<p>1.) A ultrasonic distance sensor; my concerns are that tehse are not usually waterproof.</p>

<p>2.) A pressure transducer; these tend to be very pricy.</p>

<p>3.) Some kind of level switch which provides digital input (Is water level here: yes/no?)</p>

<p>Would anyone happen to have some advice on what sort of sensor would be good for the application of reading in the tank level and using the information in a sketch?</p>
 20967: <p>There are some ultrasonic sensors that are specifically designed for this very application. I have used something simlar as a water level sensor, and they seem to be reliable. The sensor that I used was from MaxBotix, and had a range of up to 5m, resolution of 1mm, and both analog and serial data output. Interfacing it with an Arduino was very easy.</p>

<p>Have a look at <a href="http://www.maxbotix.com/articles/050.htm" rel="nofollow noreferrer">This article</a> for details</p>
