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NOTE: Update posted 1/8/2020: • Argent Weather Station... (start at minute 14:31)
UPDATE 2/18/2020:
--- At minute 7:20, I revisited this code based on correspondence with Argent Data Systems and a review of libraries prepared for their hardware. If I set the debounce constant to 15, and then multiply it by 1000 on line 56 of the code, this eliminates the problematic bounce demonstrated at 7:35. With this edit, the code does execute successfully with the bounce filtered out. In response, I updated the sketch "weatherStationMod3_g" available on www.modestmaker... under "Chapter 9" with these edits.
--- The successful code modification and tests suggests I can use a reed switch in a tipping bucket rain gage coupled with an Arduino without needing to incorporate an RC circuit and a Schmidt trigger, or replacing the reed switch with a Hall Effect Sensor. However, these alternatives are mechanically and electrically sound while simplifying the code.
--- At minute 8:29, I incorrectly stated: "Interrupts.... generally should not be used with timers that take more than a microsecond to execute". That is incorrect - I should have stated "millisecond" rather than "microsecond".
-- At minute 8:55, I incorrectly state there is a delay in my interrupt function. This is incorrect - there is no delay in the interrupt function shared in my code.
In this video, I reverse engineer how tipping bucket rain gages work, and then demonstrate how to integrate an Arduino for counting tips, which can then be translated to rainfall depth. I then demonstrate software and hardware remedies for filtering out bounce noise associated with the reed switch used in these instruments. UPDATE: Please see January 1, 2020 correction posted in comments section.
Schmitt trigger used in this demonstration available here: www.digikey.co...
Images used for gauge explanation came from these links: www.researchga...
and
www.explaintha...
Details on assembly your own gauge available here (wireless component not necessary):
www.allaboutci...
Code uploaded here:
modestmaker.co...
7 сен 2024