Water Shut Off Valve

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This is an idea I came up with to help me from wasting water and to make it easier to fill my horses water trough and water buckets. Too many times I would place a water hose in the horse trough and forget about it, just to come back an hour later and see that I had flooded the yard. I tried using sprinkler attachments to time how long the water is turned on. This worked OK, but each faucet seems to have a different flow rate and I found myself guessing at how long it would take to fill each trough. I figured there had to be a better way and this is what I came up with.

This is a very simple project that only uses a few electrical components and some PVC pipe. This is the first project that I have built using an ATTiny 85. It is a very powerful little chip and I will probably have many more projects that use it. An Arduino can be used in place of the ATTiny85 and the same code should work. If you build a lot of simple electronics like I do, then I highly recommend that you check into the ATTiny85. It can save you a lot of time and money.

Here is a list of things you will need to build this project:

• Appx. 1 foot of half inch pvc pipe
• 2 - 90 degree pvc elbows
• 1 - Solendoid valve. Mine had 1 inch NPT threads.
• 1 - half inch pvc to 1 inch NPT thread adapter
• 1 - adapter to convert 1 inch NPT thread to garden hose threads.
• 1 - ATTiny85
• 1 - SPST relay
• 1 - SPST push button switch
• 1 - 1N4001 diode
• 1 - 2n3904 NPN transistor
• 1 - 1KOhm resistor
• 1 - 3.3KOhm resistor
• 1 - 5.1KOhm resistor
• 1 - 9V battery clip
• 1 - project enclosure, water tight if possible