0

From the Forums: a high precision rain gauge #Adafruit @Adafruit

Via the Adafruit Forums, user Govner shares a build of a high precision rain gauge:

I have never been happy with the resolution or operation of “rocker-type” rain gauges. Moving parts and constricted water entry openings are inevitable sources of problems. Why not have a no-moving-parts, water-proof detector. “Waterproof” ? How can that be? Enter stage left, a piezo crystal detection unit.

This unit is capable of counting rain drops at a rate (about 2 usec between drops, est.) that far exceeds the world’s record rainfall rate (Google: South America 1.5-inches/minute). In any case, my goal was not worrying about the fact that research assigns 1 uL/drop or some such thing. I just wanted to get the big picture so I could inhibit irrigation pumps when enough rain warranted that. And with a simple evaporation algorithm, re-enable the pumps. All control had to be wireless so I just added another NRF24L01+ 2.4Ghz transceiver ($2 USD) to my existing network. Piece of cake. I used a glass mason jar which is used for preserving foodstuffs and is completely waterproof. I used a glass one (as you can see) but plastic would have been easier for drilling the small hole in the bottom for DC power. I used a diamond drill bit and it took all of about 30 seconds. No biggie.

Happy to share anything/everything done on this project. I used Pro Mini, 4 piezo elements, differential amplifier, Buck power supply (I like the buffering between my solar panel system), BME280, NRF24L01, DS3231 RTC.

I just wire-wrapped the assembly on a PCB that I designed for general purposes like this. I recommend using electrical contact grease around the lip of the glass jar just to get a great, lasting seal. (That’s another reason why I chose not to use plastic. Glass has a far superior long-term reliability in this regard).

The unit works far better than I expected and has other applications. The processing speed is so nice that, when I did the “shower stall test”, I could increase the droplet rate and see the drop-to-drop LED response. At the maximum rate, the LED just can’t keep up with the rate and appears to be lit steady.

See the forum post for more and pictures below. Nice work!

Completed_piezo_rainGuage.jpg

Completed_PiezoRainGuage_nSolar.JPG


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 14,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython 2019!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Re-evaluating Amazon after its acquisition of Whole Foods

Wearables — It’s not a deal breaker

Electronics — Higher isn’t always better

Biohacking — Vitamin-C + Gelatin for Accelerated Recovery

Python for Microcontrollers — Supercharged Supercon with CircuitPython, Quoth the Raven MOAR PYTHON! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit

Adafruit IoT Monthly — The S in IoT is for Security, Amazon announces Sidewalk and more!

Microsoft MakeCode — Xenomorph candy bucket and spooky workshops with MakeCode!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.