Monitoring Water Level in a Tank

One thing, the solenoid for use in this situation is of a special type, like this:

1 2" Gravity Feed Electric Solenoid Valve DDB CD 12VDC | eBay

Thanks for your valuable input.  Now I have the valve and e-tape.  I am looking for a controller with data logger or without.

You could use the SparkFun Logomatic v2 or a more complete system version (KTA-265).

Doug, where do I find this item

On a previous post (Some time last year) we had a member doing level measurement of a tank using an ultrasonic sensor, had perhaps a board floating in the liquid perhaps to increase the sound reflection but it was able to fairly accurately measure the level in the tank an nothing was immersed in the fluid

The solenoid part seems to be covered by other members already and that's great, the Arduino UNO or pretty much any of the current boards can do the processing job, including the PI etc. so im just providing an option re the distance measurement

Hope it provides an alternative

Peter

https://www.sparkfun.com/products/12772

https://oceancontrols.com.au/KTA-265.html

Peter and Doug thanks for the input, I am getting closer to a solution.

Peter: the ultra sound device sounds good, I only need to be within 1/8" accuracy. Can you tell me where to get the item and how to connect the pieces together. I will buy the items as soon as I hear from you.

Doug: thank you again.  I want to also build the items you suggested.  having two systems is awesome. Do you think you can help in putting these together.  I will buy the items now and I will get in tough with you when I receive them; can I do that.

just a couple of examples, I have used the first one with some sucess and there are plenty of code examples all over the internet, just google HC-SR04 to find them

http://www.ebay.com/itm/New-Arduino-Ultrasonic-Module-HC-SR04-Distance-Sensor-/271040722464

or

https://www.sparkfun.com/products/639

I would be happy to help with advice if I can. However I have not actually used a Logomatic.

If I were doing this myself, I would use a low cost water level sensor (~$3) I designed long ago and do the datalogging and valve control with a PSoC4 ProtoKit (~$4).

Great, guide me where to get these items.  I am looking at the items online but I can stop waiting for direction from you.