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Member Since: March 12, 2008

Country: United States



Intern/CEO/Janitor/Head of Research Division


Electronic Emotions

Programming Languages

C and Basic

  • I just finished a class in Environmental Economics from Arden Pope, one of the pioneers in the dangers of PM2.5. A 10 ug/m^3 increase in PM2.5 represents about a 7 month decrease in lifespan. Here in Utah, we end up getting really bad days during inversions. It turns out that PM2.5 particles go through your lungs and into your blood vessels, scraping the inside of them and also depressing various proteins which repair those scrapes. Eventually those scrapes can turn into plaques, leading to heart problems.

    If anyone has seen The Crown on Netflix, it shows how really high levels of PM2.5 can literally kill you within days. In 1952 in London, at least 4,000 people died as a result of a wide variety of air pollutants. PM2.5 is made by high temperature processes; mostly burning fossil fuels. Lowering PM2.5 in the US has been responsible for something like 20% of lifespan increases over the past few decades. Most current research shows PM10 is mostly harmless in comparison.

    It's pretty astounding that this sensor is so inexpensive! I would have thought stuff like this would cost hundreds of dollars. There must be a large(ish) market for this. I'm a bit concerned by the accuracy level though. 10ug/m^3 is huge, as the US regulatory limit is only 35 ug/m^3.

  • Awesome! This is just what I needed for some Github integration I was planning on.

  • Thanks for publishing this useful guide. I've tried to make sense of Section 15 before, to no avail. Your guide makes infinitely more sense than the legalese on the FCC website.

    Just for my clarification: can a company sell a subassembly (a circuit board) and separately sell an enclosure for said subassembly, and not need FCC testing? I'm wondering specifically if that would qualify the sub-assembly as "marketed as part of a system."

  • I see a Raspberry Pi powered Spotify jukebox coming my way soon. Ordered!

  • Ah man! I was wondering why I couldn't find this part, it was going to be perfect for a project I 'm planning. Any reason for it's retirement? Low circulation? Hard to supply?

    Any possibility of a revival?

  • What is the magic by which one of the red leds is glowing yellow?

  • It's the iconic Sparkfun red. Incidentally, having never been to a retail shop that had Sparkfun stuff, I bet their section of the store stands out a little bit :)

  • I second the mini LCD request. The schematic makes it look like they are controlled over SPI? How much are they? For $5-10 a unit with SPI so I don't need to waste a bunch of I/O lines or pay a $10 premium for a serial LCD board, I'd buy some of these for all of my projects!

  • Cool. Count me in if you guys do anything in Atlanta. We have Georgia Tech, Georgia Polytechnic, Georgia State, and Freeside Atlanta all here.

  • Sparkfun is possibly the best company in the whole world. I will be hovering over the submit button with a perfectly balanced cart.
    However, this does create a somewhat interesting problem in selecting the items. There are many possible solutions for $100, and determining the technical value of each item for future projects is difficult.
    Should I hook something up to the internet, add wireless ZigBee (did you see the 40 mi transmitter?), cell phone, huge lcd display (not as useful, but hey, pretty screen), get the SPI button for blinken lights( a necessary item for every major electronics project), get GPS, get some sweet sensors, RFID, Fingerprint Scanner, FPGA, etc.
    I have about 30 product tabs open right now, and I have no clue which will be finally selected. Yeah, gift cards immediately came to my head. Let me know if that's cheating or not, cause otherwise I'll probably just get one of them and wait until I know for sure what I want to do before getting anything.
    My hs senior engineering project is about to get amazing.

No public wish lists :(