triggering a Arduino pin when water in tank goes below

hello expert's

I am looking to buy some cheap water level sensors for my tank . So would u guys suggest me which one should I buy. Actually I want to trigger a pin when water goes below particular level (I am using solenoid valve to trigger ) So your help Is much appreciated

Thank you and sorry for my bad English

It is same topic here.

https://www.sparkfun.com/products/10221 might be useful

Rubix-Arduino: It is same topic here.

No actually I was asking for water level sensors and I think I need a programming help. sorry I posted in a wrong section

AMPS-N: https://www.sparkfun.com/products/10221 might be useful

That's very costly. Any other sensor whIch will be cheap

If you have chosen already the level sensor gives us data sheet . COde. you need to try ur own as per your logic. If any problem in reading we sort out here.

No one will write program for you

AMPS-N:
If you have chosen already the level sensor gives us data sheet . COde. you need to try ur own as per your logic. If any problem in reading we sort out here.

No one will write program for you

No I didn’t decided the level sensors. Is there any cheap sensors ? and yeah I can make the code according to my logic .

water level for Arduino....

http://www.ebay.com.au/itm/Liquid-Water-Level-Sensor-Right-Angle-Float-Switch-PIC-AVR-for-Arduino-/321557626771?pt=LH_DefaultDomain_15&hash=item4ade53ff93

http://www.ebay.com.au/itm/Level-Switches-Liquid-Level-Sensor-Liquid-Plastic-Ball-Float-For-Arduino-/281493772975?pt=LH_DefaultDomain_15&hash=item418a561aaf

bluejets: water level for Arduino....

http://www.ebay.com.au/itm/Liquid-Water-Level-Sensor-Right-Angle-Float-Switch-PIC-AVR-for-Arduino-/321557626771?pt=LH_DefaultDomain_15&hash=item4ade53ff93

http://www.ebay.com.au/itm/Level-Switches-Liquid-Level-Sensor-Liquid-Plastic-Ball-Float-For-Arduino-/281493772975?pt=LH_DefaultDomain_15&hash=item418a561aaf

Thank you very much . Can u pls give me basic programming example of this ?

Your help is much appreciated

www.electroschematics.com/9964/arduino-water-level-indicator-controller/

I think this is the most cheapest method and its easy to go. Is there any problem with this method as I am using solenoid valve so any interference with 5v ? Or possibility of damage to my solenoid valve?

How long is a piece of string?

Show us what ideas you have (circuit diagram) and we may be able to advise you.

Show voltages if you are interfacing with hv solenoids etc.

bluejets: How long is a piece of string?

Show us what ideas you have (circuit diagram) and we may be able to advise you.

Show voltages if you are interfacing with hv solenoids etc.

I don't get you by piece of string ?

Here is the circuit diagram

Photo will not open....anyway, we need a layout of your system to know what you want to do.

You previously ask for detailed help but we have no idea of what you are building.

bluejets: Photo will not open....anyway, we need a layout of your system to know what you want to do.

You previously ask for detailed help but we have no idea of what you are building.

I used IrfanView to open it and it found an error, but did display to schematic.

Paul

saifkazi: Thank you very much . Can u pls give me basic programming example of this ?

Your help is much appreciated

Those ones are just switches - use it just like you'd use any button or switch.

They're basically a toilet float valve, only with a switch instead of a valve - think of it as a toilet valve with a microswitch on the lever.