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A Rain gauge is one of those sensors that is a great addition for your DIY weather station.

Finding a stand alone rain gauge is not that common, so I decided to purchase an off the shelf digital rain gauge monitor and remove the rain gauge sensor off it to make my own arduino powered rain gauge monitor.

In this tutorial, I’ll show you how to make a digital rain gauge monitor by using a rain gauge sensor from an off the shelf product, how this particular sensor works and how to read the signal with an Arduino Uno then finally display the result to an LCD Display. So, keep reading to find out how......or Watch the Video below if that's easier.....

Step 1: How Does the Sensor Measure Rainfall

The rain sensor measures rain by collecting a set amount of water in a tipping bucket. When the preset amount of water is collected, the bucket tips the water out and a magnet swings past a reed switch and activates a single count.

This count is read by the microcontroller's input as a pulse. This particular sensor I'm using is set to 0.8mm per bucket of water. The rainfall detected by the rain sensor will vary between manufacturers.

<p>Would have been much more help to have links to source the tipping bucket sensor and had a cost. Even better would be a project to build your own sensor and give the math to compute volume of the bucket to design your own and also the dimensions of the collector funnel and how that relates to the computation of rainfall rates.</p>
<p>Thanks for your advise. It sounds like if would be a good project to do.</p>
<p>Cool Project! A nice digital alternative to other measurement methods. Have you considered weighing the bucket? Weight translates very easily to volume.</p>
<p>Thanks ! Instead of weighing it, I used a syringe filled with water to fill up the bucket to determine the volume that would tip it (that is with the funnel off). In this case it turned out to be about 4.4 mls of water which equates to 4.4g. The interesting thing though, when you place water through the funnel to tip the bucket, it required about 5 to 5.5mls of water. I think this is because about 1/2 - 1ml of water sticks to the funnel and it's mesh/grating and does not reach the bucket.</p>

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Bio: As and electronics engineer I am amazed at how gadets work. Having experience in PIC programming using low level assembly language, I am very impressed ... More »
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