[werk_ag]

Hi Caneira,
Thanks for the quick response. Software details are RX v1.4_b035 and the TX v1.4_b003.
I am not using a FO rain gauge. I picked up a cheap rain gauge from a local shop. I am attempting to match the output on the receiver it came with to WeatherDuino project. 1 tip from this gauge equates to 0.78mm according to the digital indicator that came with the gauge. I have tested on 50 continuous tips and this volume appears consistent. Just trying to now use this gauge with WeatherDuino.

Hello, Ian

These changes are specific for you, and I'm given them without guarantees.

Download the latest software release
Overwrite your installed ClickButton library, with the one included in the software package.

Keep the changes you already did in line 86 of the TX (v1.4_b003) software.

In the RX (v1.4_b037) software change line 154, to this:

Code:

const byte UnitTip_value[3]  = {80, 30, 25};

Upload to Nano
Press the push button for 5 sec or more to perform a "factory reset" and follow the instructions shown on the LCD display.

In Cumulus software, set the rain multiplier to 4.0
Hope it works

[AllyCat]

Hi,

1 tip from this gauge equates to 0.78mm according to the digital indicator that came with the gauge.

That does seem unusully large. Personally, I would increase the "collection area", probably by using an external funnel, to get down to 0.3 mm per tip or less. I believe the normal threshold between a "wet day" and a "dry day" is 0.3 mm.

Cheers, Alan.

[werk_ag]

@Alan, I agree with you
It's better trying to increase the "collection area" than do the proposed change in the software. A value of 0.8 per tip will produce very unreliable rain data, and in some days of light rain, it will not register any rain at all.

@dormani
Maybe you could calculate the "collection area" of your rain gauge, and do the change proposed by Alan. If you could increase it by nearly three times you will get a tip bucket of nearly 0.3mm. I'm not the best guy to help with this matter but certainly there is people here in the forum who could help you with the calculations.

[JT118]

Do this then you will know exactly what your gauge is actually doing, and then one can alter the sketch arithmetic.

Correct way to calibrate and check Rain Gauge:

http://www.meteocercal.info/forum/Thread...in-Sensors

post 7, 14 22 and 23. All other ways; trying to work out bucket volumes etc. will lead to errors. Once you have done this you will then know for sure what each tip actually represents.

If you do the process laid out you will know it is working and that 0.2 or 0.3mm or the number you have calculated of rain has fallen after one tip. To check the rain gauge you need to feed a volume of water equivalent to at least 10 mm of rain through your gauge. If the collector area is (as in FO gauges) 55 sq cm then you need to feed exactly 55ml of water into your gauge in the manner prescribed. This is the 10mm of rain falling on your collector. Please see above link for a step by step guide. Start with post 7 in link above.

If 1mm of rain has fallen then this is 1 mm deep over any area. As correctly pointed out that is equivalent to a litre over a square metre or 10 000 litres over 1 hectare or 10 tonnes of water over the hectare.

As noted before we are measuring tiny proportions of huge things and small errors multiply up which results in useless data very quickly.