Irrigation Timer With Rain Sensor of Clocks.




Introduction: Irrigation Timer With Rain Sensor of Clocks.

Guide how to make a irrigation timer from the wall clock with rain sensor In 7 hours valve opens and closes at 9 - twice a day. In the valve does not open when it rains.

This timer I did because I bought a timer as in the photo. It does not work with the tank. He has a small cross section. It takes to the water supply Connection of a high pressure. My drip with it not working

Step 1: ​We Need

  • Wall Clock;
  • 3x reed switch,
  • 2x the magnet;
  • 3x batteries;
  • 2x buttons (you can not install if you do not need manual control);
  • Transistor IRLML6404 (all P-channel logic) - if you do not need a rain sensor, too, can not be installed;
  • Motorized three valve pin CWX-15Q CR02

Step 2: The Scheme Is Very Simple.

Step 3: The Algorithm

The algorithm is - when the minute hand will be in front of the numbers 12 (the first reed switch).

A sterelka hour in front of 7 hours (the second reed switch), the voltage goes to the transistor. If there is no rain, it will be opened as the gate electrode shorted to negative. With transistor electric current is supplied to the valve and opens it.

When the arrows are 12 and 9, the current through the reed valve closes electro.

Step 4: Drill Hole

Step 5: Arrow Hours - Cut, Bends, Glue a Magnet

Step 6: Glue Reed

Step 7: Mount Battery and Glue

Step 8: Solder the Wires to Connect the Transistor and a Scheme.

Step 9: Make a Rain Sensor

to the segments of stainless steel wire solder wire.

Take the box and cut a hole in the cover.

Place the electrodes into a napkin.

Add a pinch of salt.

Step 10: ​All Is Ready.

Now, when there is rain in the 7 hours and opens valve 9 closes twice daily.

More details about the manufacture and demonstration of the work can be viewed on video.

Thank you for attention.

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    2 Discussions


    3 years ago

    An electrical timer (or electronic) costs less than 10€, it can drive loads up to 15A in 250VAC. Your idea is clever but I'm afraid lots of needles won't move with the additionnal weight of a magnet as their balancing is very accurate.


    Reply 3 years ago


    I have different timers. This device works on the field where there is no electricity. The weight of the magnet is less than 0.1 grams - my scales can not feel it. The watch works fine. Since the gear ratio in the mechanism of a clock is very large, the clock is not disturbed as they are synchronized quartz resonator. And the power of attraction of the magnet to the reed is very small.

    Thank you for your opinion.