The wheels on the bus go round and round

…which may or may not affect the operation of our latest prototype. Only field testing will tell with any given degree of certainty. In late september, we were invited to a meeting with representatives from Telenor Reseach and the Northern Research Institute, which were on the lookout for mobile outdoors air quality sensors that could be mounted on bus rooftops in Tromsø, Norway. The sensor modules should be able to detect PM2. »

Fun with chemicals, lasers and really high voltages

Homebrew ESD Safe Component Trays. Assembling printed circuit boards is easy. You manufacture the PCB at location A, and then ship it to location B, along with some gerber files and a component list. The PCB is covered with a stencil that is used for applying solder paste. The PCB (with applied paste) is then fed into a pick and place machine that mounts the components, before it is fed into a reflow oven. »

A functional IAQ IoT Device

In the previous post, we prototyped a simple sensor shield in Eagle. There is still plenty of available space left on the PCB and sensors are cheap. Let’s add some more stuff and build a functional device. Adding Sensors We already have a CO2 sensor in the design. This can detect CO2 concentrations of 450 - 2000 ppm and TVOC (Total Volatile Organic Compounds) equivalents in the 125-600 ppb range. »