You should buy a PurpleAir air quality monitor

Check this out: In July of 2018 I paid $244 to a company called Adrionics for a chunk of PVC stuffed with electronics, the PA-II: It’s a sophisticated, lab-grade piece of hardware – twin laser-based light scattering particulate sensors, and it measures how much junk is in your air. In particular (a pun I am […]

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10gig completed

Two sfp+ transceivers and some reconfigurations layer… Note the magic “10G” lights! Full view. A test via nfs shows 300MB/sec writes and 350 reads. Next I can play with jumbo frames and such. Might put an old SSD in the NAS to see if it’ll speed it up. But even so it’s super fast.

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Sunday prints

Cat and butterfly came out great, the Eiffel not so. Tomorrow I try a portsfilter stand for a friend.

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Power

I like having ways to see and measure things. Here is my server build: Here is a simple AC wattmeter showing its consumption: And here’s the system in infrared showing hot spots: Measure and don’t just guess. More on low power Linux to follow;).

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Power and energy consumption

I built a system that uses a ‘Raven’ Zigbee USB radio and Raspberry Pi to monitor our SDG&E electric meter, and layered Flask and D3.js on top to display usage. Sometimes it looks quite cool: The baseline for the house is 225 to 250W, and the plateaus are the (high efficiency energy star) refrigerator. You can […]

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