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24th May 2020 Login  
Rain Collector Guage question
by Peter at 2011-02-25 09:50:52 (Blog::Peter)
Looking for advice on connecting a rain guage collector to an existing data logging system please.
I am hoping to add a tipping bucket rain gauge collector to the APRS Wind Logger system, which is co-located with our Bergey 10kW wind turbine (info on the APRS logger is in this blog for anyone who is interested).

The APRS logger has a number of powered analogue inputs, to which you can add a variety of sensors including most tipping bucket rain gauges which work by having a magnet pass over a magnetic reed switch every time they "tip". Basically I think this reed switch just needs to be connected between the data logger's sensor ground and one of the anemometer channels. Then you just set up a "counter channel" to count the number of pulses on that channel. This would cause the counter to increment by 0.01 every time the rain gauge tips and sends a pulse. This is a daily counter and the data logger resets it to zero at midnight (or if the data logger is powered off).

The APRS is pre-calibrated for collectors supplied by Davis (eg. the Davis 7852) but should be able to work with any collector using a magnetic reed switch.

I happen to have an old Oregon Scientific rain gauge WMR series collector which uses the same sort of tipping bucket. Not very sophisticated, but it might do till I can afford a more robust Davis collector - the information produced will only really be for interest.

Does anyone know if I can modify it for use with the APRS logger? I would obviously need to calibrate it.

Grateful if anyone is able to share any experience in this area.

Thank you.

--
Peter

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