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]...
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dbsnp | " Definitely. Two things: I'm trying to find a difference between using an Arduino Mini Pro or an ATmega328, because they seem to be fairly the sa..." | Read more » | over 5 years ago | |||
cfastie | " More clarification on the display: For a battery powered logger, you could use an e-paper (e-ink) display which retains the image after it has bee..." | Read more » | over 5 years ago | |||
cfastie | "I'm glad this might help. One clarification to my comment above: Adding a display to the logger works best if the logger is plugged into the wall (..." | Read more » | over 5 years ago | |||
dbsnp | " This is beautiful! Thank you so much! I heard stories of your feats at the last Barnraising, and I am glad that you're responding to this note. T..." | Read more » | over 5 years ago | |||
cfastie | "It is quite easy to build the environmental data logger you describe for $15. All of the parts for a Mini Pearl Logger can be ordered from eBay for..." | Read more » | over 5 years ago | |||
liz | "For future readers of this thread, @samr did repost here: https://publiclab.org/questions/samr/04-07-2019/how-to-interpret-pms5003-sensor-values " | Read more » | over 5 years ago | |||
warren | " Hi @samr, would you be able to repost your last questions on https://publiclab.org/purpleair#Questions, and we can then try to get the word out a ..." | Read more » | over 5 years ago | |||
samr | " hi. we are trying to use the pms5003 sensor for a school project to take air quality measurements. We don't have much experience with air qualit..." | Read more » | over 5 years ago | |||
zengirl2 | " Looks shipshape to me! " | Read more » | over 5 years ago | |||
mr11yaseen | " very nice post Thanks for this post " | Read more » | over 5 years ago | |||
warren | " Just linking in your excellent question here: https://publiclab.org/questions/wu_ming2/02-02-2019/how-do-i-calculate-error-for-averages " | Read more » | almost 6 years ago | |||
onedollarwebhostings | " Get a great lesson for this post. Visit at http://www.onedollarwebhostings.com/rs-99-web-hosting-domain-godaddy-india.html to get a best hosting o..." | Read more » | almost 6 years ago | |||
wu_ming2 | "I posted a related question awaiting approval but may be more useful to follow up here. I am trying to estimate the error for PA2.5 values as prov..." | Read more » | almost 6 years ago | |||
icarito | "So beautiful! " | Read more » | almost 6 years ago | |||
cfastie | " The simplest modification to make the sketch save to SD card once per minute is to change the line: if (logData == 1) // wr..." | Read more » | almost 6 years ago | |||
jkbufu | " Hello How to change the code to write data delay 60s, i try and cant do that ? Where change that ? " | Read more » | almost 6 years ago | |||
humanetechnologies | "Hi @warren, I am sorry for the delayed response. Thanks much for your understanding. I have just modified the page to avoid any such confusion. Tha..." | Read more » | almost 6 years ago | |||
cfastie | "Liz, it's great to know that you (or I guess your Mom) were well coiffed in the 80s, although I regret that you did not include photographic eviden..." | Read more » | about 6 years ago | |||
liz | " Dear Chris, as a child of the eighties myself, i can corroborate that the effects of Aquanet hairspray on respiration are quite significant. Were ..." | Read more » | about 6 years ago | |||
B-winters | " Love this. I am definitely going to try building this at some point, but don't have the time right now. Perhaps after January term. I am coming b..." | Read more » | about 6 years ago | |||
roberts_ecofarm | " This seem relevant this time of year... https://www.pbs.org/newshour/science/freshwater-is-getting-saltier-threatening-people-and-wildlife " | Read more » | about 6 years ago | |||
lincomatic | "Some anecdotal evidence.. I've built my own PM2.5 monitor using the PMS5003, and have found it to be very resistant to influences of high humidity,..." | Read more » | about 6 years ago | |||
SadiePrego | " @warren @Bronwen thanks so much you guys! " | Read more » | about 6 years ago | |||
Bronwen | "@warren That's on me! I suggested breaking this up into a few posts just because the focus of activities are all so different and I wanted to make ..." | Read more » | about 6 years ago |