Relatively inexpensive, transportable and deployable sensors are produced all over the world for a variety of analytes. Broadly defined, sensors respond to a physical or chemical property, providing an interpretable output. For our purposes, a main distinction of a sensor versus a sampler is that sensors do not require laboratory-based analyses, and provide outputs in near-real time. Though we often think of sensors as part of the electronics field, plenty of analog sensors have been available for decades. Common analog sensors include things like mercury thermometers and classic barometers. Common digital sensors include things like voltmeters. In Public Lab, we're interested in a broad variety of sensors, both analog and digital, designed for measuring chemical and physical properties in air or water. ###Air Sensors There are a ton of different air sensors on the market these days, with common analytes including carbon monoxide (e.g. smoke detectors), temperature, humidity, particulate matter, and more. Some of these sensors require a digital interface with a controller and data logger, others are analog. Please see more information [here](/wiki/air-sensors) and check out air sensors in the table below. Please add more sensors that you've used! [embed table] ###Water Sensors Water sensors are available for several analytes, such as salinity, pH, and depth. Like air sensors, water sensors may be digital or analog. Any digital water sensors that are meant to be deployed will require water-tight enclosures for the electronic components. Please see more information [here](/wiki/water-sensors), and check out and add more sensors to the table below. [embed table]...

Author Comment Last activity Moderation
ew4cm "Hi. I had the same problem with sd-card. My PCB board was wrong. " | Read more » over 1 year ago
alejobonifacio "Reading a little more I found that you could change the frequency of the PWM in arduino. I did not try to do this. " | Read more » over 1 year ago
alejobonifacio "Hi! good question! The frequency of PWM of arduino is about 500hz. Is that enough for conductivity measurement? " | Read more » over 1 year ago
lalegitimate "Are you looking for Finance? Are you looking for fast cash to enlarge your business Interested people should please contact us reply to us (Whats ..." | Read more » about 2 years ago
PeterBella "@fongvania @stevie Thank you for the EPA Colocation Instruction Guide slide deck. @TravisLondon The info linked above in the slide deck does a grea..." | Read more » about 2 years ago
stevie "Great info! thank you! " | Read more » about 2 years ago
fongvania "From this Guidebook for Developing a Community Air Monitoring Network: If possible, permanently install a community monitor at the colocation site..." | Read more » about 2 years ago
eustatic "I think it all depends on the sampling rate and whether the data converge, ha. For electronic monitors sampling every few seconds, two weeks isn't..." | Read more » about 2 years ago
Ag8n "We were in an medical environment, usually class 100,000. These instruments are different from the ones used by public lab, but based on the same ..." | Read more » about 2 years ago
mamamia0819 "Nice project! Our company( is also engaged in microbe species. Your task is quite useful. " | Read more » over 2 years ago
mr_juara17 "This is such a beautiful and cool project tho! The lapse rate calculation is so fun to see. Regards Pengeluaran Sydney Tercepat " | Read more » over 2 years ago
warren "Just noting also a big round up of notes on humidity and fog with optical sensors here:" | Read more » over 2 years ago
jhonyking241 "With the current global health crisis, we believe that the fight will happen in a limited audience situation. Many people will just stay at home an..." | Read more » over 2 years ago
liz "thank you! If you have a picture, would be great to see that as well. " | Read more » over 2 years ago
vkozloff "One more improvement: we can put a through-hole 10k resistor in 2 and 6 (on the top of tpl5110) to have "done" pull-down in place. " | Read more » over 2 years ago
hansley10 "Thanks for sharing these great tips about blog commenting. Keep up the great work. best server for small business " | Read more » over 2 years ago
Ag8n "I don't know if it's viable in this area or not. For blood analyzers, the approach one company was taking was photon counting. That was 15 years ..." | Read more » almost 3 years ago
zakutnya "Thanks for this great tutorial, @cfastie! This is exactly what i needed for my ESP-12 + BME280 + EPaper display project. I use 300mAh Li-ion batter..." | Read more » almost 3 years ago
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dp380035 "Just a questions, How do I program in order for me to get the GPS to work with Arduino Nano or Arduino Pro Mini. I had some trouble getting to wor..." | Read more » about 3 years ago
komugi "Were you ever able to see how the TDS data given by the sensor compared to the actual TDS level of your water? " | Read more » over 3 years ago
liz "Hi @wln215 , I just spotted this question and wanted to at least respond in appreciation for you for answering other people's questions. :slightly_..." | Read more » over 3 years ago
fxp007 "Could you share some info about the light sensor you choose? " | Read more » over 3 years ago
dallastxroofingpro "good article " | Read more » almost 4 years ago