Sensors
sensors

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
rmeister "Cool, thanks for your effort! " | Read more » over 8 years ago
warren "Oh, cool! I heard that "dimming" occur when I piped the sound through a small amplifier, but didn't know it was supposed to be that way. Neat. Than..." | Read more » over 8 years ago
rmeister "If the nanite's output is 3V, then the voltage at your phone will be about 3V as well for the first few periods. But after a couple of periods the ..." | Read more » over 8 years ago
warren "Another question... I see that voltage on a 'nanite' arduino clone is ~3v, and I'm wondering; peak to peak line load seems to be around -1.5-1.5v f..." | Read more » over 8 years ago
warren "https://github.com/publiclab/webjack/issues/17 " | Read more » over 8 years ago
warren "Maybe we should create an issue on the WebJack project so as not to make this thread too long. I made some progress (rather crudely) copying over ..." | Read more » over 8 years ago
warren "It looks like SoftModem-for-attiny85 doesn't include this line: https://github.com/rmeister/SoftModem/blob/webjack/SoftModem.cpp#L273-L304 // Bri..." | Read more » over 8 years ago
warren "OK, finally got some feedback, though not sure how helpful; I actually got stuck on installing softmodem itself; error here: https://gist.github.c..." | Read more » over 8 years ago
rmeister " For an (unequally) attenuated signal, the amplitudes for f_low and f_high are uneven. In this case, the amplitude for f_high is very low. Cool, ..." | Read more » over 8 years ago
warren "What are you looking at specifically when you see that the higher frequencies are attenuated? What part of the waveform, can you highlight it? I s..." | Read more » over 8 years ago
rmeister "Oh yes, the signal is still attenuated. Didn't see that on my phone yesterday. " | Read more » over 8 years ago
kinasmith "yeah. no dice...still doesn't work. I'll try it on a different phone when I get home. " | Read more » over 8 years ago
rmeister "Cool, looks good. Thanks for your effort! Maybe try switching the wires to sleeve and ring2. " | Read more » over 8 years ago
kinasmith "Hah. That's flattering, but my background isn't electrical engineering...I just kind of stumbled into it. The circuit is pretty obvious now that I ..." | Read more » over 8 years ago
rmeister "Probably you ment an other circuit, as I see you have a background in electronics engineering :D " | Read more » over 8 years ago
rmeister "It's a voltage divider (so your phone won't be damaged by a too large voltage) and a high-pass filter (removes DC voltage). Would you give it a tr..." | Read more » over 8 years ago
kinasmith "I was using Chrome. Didn't try any others. Just curious, but what is the function of the circuit? " | Read more » over 8 years ago
rmeister "Wow, thanks @kinasmith! Probably this pulses are sort of a presence detection for the microphone? Could be an issue, but most of the signals from ..." | Read more » over 8 years ago
kinasmith "Just tested, didn't work. Phone: Xiaomi MI3C, MIUI 7.1.2 (Android 4.4.4) Component Values: R1, 2.2k; R2, 2.2k, C1, 2µF; R3, 10k. I also tried s..." | Read more » over 8 years ago
rmeister "A friend of mine just tested the demo site of the FSK generator with his iPhone (ios9.3.3). The script does not seem to work anymore :( " | Read more » over 8 years ago
dusjagr "@warren, i am referring to some barriers for connecting to iphones. conceptual barriers that can be circumvented exactly by this method. we use the..." | Read more » over 8 years ago
warren "Wow that's pretty exciting -- safari/iOS would be a huge feature to have. I'm wondering if folks are interested enough in this project to submit a..." | Read more » over 8 years ago
rmeister "Hi @dusjagr, thanks for that hint! Found a Safari compatible version of the FSK generator in your link section. At least sending data to the µC sho..." | Read more » over 8 years ago
warren "Oh, that's so rad, @dusjagr! Why are you keeping it from apple? The WebRTC lib doesn't work on iOS anyhow, since it's not an open platform, but jus..." | Read more » over 8 years ago