Topics created by pierrot10

Hi @pierrot10 and others, Sorry, I was called away unexpectedly... I've had no experience using nails other than testing the gyprock ones in the link I sent. I think your idea of 9 pairs spread across the wall is excellent as the key data you seek is the moisture source and how it progress across the wall. You can just connect the 9 sensors to one of those analog switch modules and the Feather and start logging data. You biggest problem will probably working out the distance between the 2 nails. Once it setup (in summer), you can make sure they all read the same value by a software 'calibration value' for each pair. I'd also suggest putting a newer BMP680 device in the room, perhaps 3" to 6 " away from the wall, just to have a temp, humidity and barometric pressure. I don't know exactly what it my tell you, but one thing I have learned is 'data is like money', there is no such thing as too much! (especially when you only get one shot at it a year). I think your chances of success look good as long as the distance between the two nails give you a sufficient data range. Good luck, and I look forward to reading how it turns out. Paul

Hmmm. Looking up scintillometers, I see they are advertised as "large aperture", so you may need an array of photo[diodes,cells], which adds a lot of complexity, matching, summing etc,but maybe you could get away with a condenser lens.

@scalz Maybe this: https://en.wikipedia.org/wiki/Net_radiometer I'm not sure if it's overkill, but it does look like it would do the job.

@pierrot10 1 mm of rain over 1 square meter is 1 liter of water. Correct! One liter makes 358 tips so one tip is then 2,7932 milliliters that is correct. But rainfall mm/hr is 2,7932 * nbr of tips only if the area of the funnel is 1 square meter. Your funnel is only 55 square centimeters so you will only collect 55/10000 of the rain that falls on the whole square meter. The example you are using at the top of your post does not have the size of the funnel anywhere in the code.

@suhaila96 Hello I have not seen your question since I reviewed this topics, today. What do you mean about "setup your circuit"? How did you connected you watermark sensor and to what?

Hi there! Reading the Watermark sensor is no easy task indeed. Took us a while to get accurate and reliable data out of these sensors. First of all, take a look at the official documentation provided by Irrometer: https://www.irrometer.com/200ss.html Especially the pseudo-AC excitation is very important and make sure you calibrate the readings using the soil temperature. There's quite some off-the-shelf hardware on the market already. Look for a device that has a low power consumption so you can measure throughout the year, for example: https://www.crodeon.com/blogs/news/connecting-a-watermark-sensor-to-the-cloud Let me know if you have any more questions!

@pierrot10 Look for tipping bucket on this site... The search facility is invaluable...