I am planning on getting a few of the new Pi Zero boards soon. I need to build several environmental monitoring packages to monitor vent temperature, airflow and humidity of two different HVAC units and two temperature sensors in the room monitoring the hot and cold side of the server room. Planning on building a homebrew monitoring solution to email and text if anything goes out of range before we have another meltdown if both HVAC systems stop working at the same time. Would be nice to have logged data for graphs to see what the trends are. I have several simpler setups I would like to also build for wiring closets and my home gameroom and shop.
Wonder if anyone has printed nozzles for airflow measurement yet. Smaller ones should be doable, although surface roughness could do odd things to the Reynolds number.
@StanSimmons
That resonator circuit can be modeled in Microwave Office, aka AWR, now owned by National Instruments (yup, LabVIEW crew). I have the evaluation software on my machine, but I would have to beg for another eval extension to pull it out again.
A few other interesting observations about the resonator: Note the vias dotting around the periphery of the resonator and the entire ground plane. Note the row of capacitors between the ground plane and ELPIDA part. Wall o caps! And finally, notice the smooth trace. Now I would argue that I’m not sure that was necessary, but they did it and they can if they want to.
At the frequencies in question, the length of trace is no longer considered lumped. In other words, there is a distribution of voltages across the trace as the signal propagates down it because it is switching that fast (or sine-ing to be more to the point). I worked in a lab where such analog traces were testing and reference designs such as this was created. Power levels, noise figures, CMRRs and analog quantities of much craziness are computed and measured using VNAs, spectrum analyzers, and if the lab manager was super sharp-NI PXI based equipment. This is where guys who speak no english probe around on boards with capacitive probes and bridges and watch smith’s charts while computing impedances and reactances in real time.
Meanwhile, there are a few of these titans of analog lurking amongst the membership of DMS (not I, I am but a mere mortal). Nevertheless, pretty cool that pi board.
Somewhere in the blizzard of stories yesterday, I read that production of the RPi0w will be in the 10,000’s/week instead of the 1000’s/week of the RPi0 at launch.
3E8Tech Purchasing Department just placed an order, so I hear…lol…
Something about a spin off of the DMS Raman, but maybe more interferometer-like and maybe less molecular weighty… prolly good for things like measuring Ra on, dunno, engine rebuild surfaces…
to tell the truth i have no idea where they come up with this stuff…