Water Quality Sensor

Developed during the Water Hackathon on March 23-25 in New York City, the water quality sensor is a multipurpose tool for collecting data remotely. This tool is rapidly changing and is being used as part of the on going research initiative called [DontFlush.me](https://web.archive.org/web/20160111004345/dontflush.me) (archived). This tool consists of an Arduino microcontroller, a set of water quality sensors, and a network connection module. As currently developed this tool uses a GSM based cellular module to send data via SMS. For this design a custom arduino shield was created. This shield allows the arduino to be powered by a 3.7v lithium ion battery. The shield includes a 3.3v to 5v setup circuit based on the Adafruit Mintyboost. Currently there are two versions of the shield. Both versions use the waterproof digital temperature sensor from Adafruit. The shields differ in the electrical conductivity probe they are designed to use. Electrical conductivity (EC) is basically a measure of water's purity. The more pure the water the less conductive. When pollutants enter water it usually causes an increase in EC. Lots of details about EC are available from the EPA site. The first probe is DIY. It was created using designs published in the book Environmental Monitoring with Arduino. This probe uses readily available parts from most Radio Shack stores. More details about this probe will hopefully be posted with permission from the book's author. The second type of electrical conductivity sensor is much more expensive but is lab quality. Its available from Atlas Scientific. Here is the shield designed for the Atlas Scientific probe. Connected between the battery and the Arduino is a solar charging circuit. And also use for [quality control systems](http://www.aquar-system.com/). This is connected to a 2w 6v solar panel. Both of these are available from Adafruit. The data from this sensor is uploaded to Pachube using a GPRS shield from Seeedstudio. The initial prototype was using a TCP/IP connection, which requires a SIM card with a data plan, but the Arduino code is poorly optimized for long durations. The second prototype is sending SMS messages directly to Pachube's beta SMS gateway. Here is the sensor all wired up in a pelican case with the solar panel on the top. ...

Author Comment Last activity Moderation
EdMallon "A summary of the many waterproofing methods we've used over the years. Might be a few ideas there that Public Lab builders find useful: https://the..." | Read more » 4 days ago
xose "Añadir clavija al sensor Coqui para grabar las mediciones: https://publiclab.org/notes/imvec/07-02-2022/anadir-jack-al-coqui-para-grabar-mediciones..." | Read more » 9 months ago
infowavex9 "It is the technology of automatically collecting consumption, diagnostic, and status data from water meters. Wavex coin Wavex is a US-based Coin th..." | Read more » 10 months ago
liamann67 "  Expert tips for writing bsb42015 answers easily When it comes to writing different assignments in leadership and management. Download the s..." | Read more » 12 months ago
EdMallon "The ones from Fisher Scientific and Thermo have notably better quality seals than no-name brand tubes. So if you are putting them somewhere swampy ..." | Read more » about 1 year ago
bhamster "Thanks for this update, @EdMallon! I read the full post you linked and laughed at "Pro-Minillennium Falcons." :smiley: The Falcon tube housing is n..." | Read more » about 1 year ago
EdMallon "This latest update was motivated by several factors but the most important ones were: (1) Our own project has grown to the point that every fieldwo..." | Read more » about 1 year ago
liz "What a fantastic update! It's great to hear from you @EdMallon. An underwater logger running for a year on a single coin cell battery?? COOL. Taggi..." | Read more » about 1 year ago
EdMallon " It’s been a long time since I posted, and you’d be forgiven for thinking the Cave Pearl Project was yet another victim of COVID. While the attend..." | Read more » about 1 year ago
mauriceatkinson "Hi I would love to build a system just like this but I am concerned that the github libraries are over 4 years old and look like they are not manin..." | Read more » over 1 year ago
liz "Fantastic! Just adding some screenshots of your videos so people can get excited: " | Read more » almost 2 years ago
EdMallon "Finally have acceptable screen captures exporting from zoom (though frame rate is low) so we've been producing tutorial videos for Dr. Beddows inst..." | Read more » almost 2 years ago
SteveGoldman32 "Hi Everyone Just thought I should post a progress update on the Cave Pearl Project. We finished off 2020 with a challenging field trip that had so..." | Read more » about 2 years ago
digitaldipak "This is really a good one with a proper circuit diagram as well as with all the step by step procedures. Keep sharing more in the future. Have a go..." | Read more » over 2 years ago
EdMallon "With Covid making it hard to predict whether students will be in the lab, or working from home we’ve done an incremental update to the ‘Classroom L..." | Read more » over 2 years ago
EdMallon "Progress with the LED light sensor technique revealed that you can can also measure temperature by timing the reverse-bias charge decay on ANY type..." | Read more » over 3 years ago
EdMallon "With the school year beginning we have some new instructors spinning up their own courses around the classroom logger released earlier this year. ..." | Read more » over 3 years ago
dominictoretto1831997 "I wrong or this could be considered as "method"? Its own particularities made the KnowFlow a different one than Coqui, Riffle or Mae d'aigua. I'm b..." | Read more » over 3 years ago
roberts_ecofarm " Really liked the tutorials! " | Read more » almost 4 years ago
EdMallon " I've been experimenting with the Input Capture Unit on our pro mini's 329p processor, and with it you can make ‘High-Resolution’ Sensor Readings ..." | Read more » almost 4 years ago
EdMallon "You can use a Pro Mini (or any other Arduino with an Atmel processor) to measure temperature using only the mcu. I think this is the best "No-Par..." | Read more » about 4 years ago
EdMallon "A high-school teacher friend asked us for faster build that is less dependent on soldering because they don't have the budget for that kit. So we'v..." | Read more » about 4 years ago
EdMallon "Dr. Beddow's instrumentation students have been building our EDU logger for more than three years and, based on that experience, we've redesigned t..." | Read more » about 4 years ago
DoraWest "Pleasant post. I was checking continually this online journal and I am awed! To a great degree supportive data extraordinarily the last part I admi..." | Read more » about 4 years ago