![]() Hello – After reading about your Sensor Hub on Hackaday I bought an SEN55 from Mouser for testing. Posted in hardware, home hacks Tagged air quality, Air quality sensors, particulate, particulates Post navigation If you’re looking for a cheaper “baby’s first air quality sensor”, drop by your local IKEA - there’s a way less featureful but quite cheap sensor that you can equip with an ESP8266, perhaps, even on a custom PCB. ![]() Having a full open-source package like this at our disposal is amazing. Such air quality sensor platforms have been getting more and more popular, and hackers have been paying attention. The firmware, KiCad files, 3D holder and even Grafana dashboard files can be found on GitHub. Of course, everything is open-source and comes as a complete packages for you to start using. That said, it’s a great value for the price, and the trove of sensing data you can get might just more than pay for itself in quality-of-life improvements you make. But you’ll notice there’s also a trove of connector footprints for different interfaces whatever else you might want to add to your sensor hub, whether it connects through I2C, SPI or PWM, you can! As usual, the sensor itself is the most expensive part of such a project - the boards themselves are around $5 USD apiece fully assembled, but one sensor-included hub will set you back roughly $42 USD. The PCB itself might look simple, it’s simply an ESP32 and some supporting circuitry required. That’s not all, however - this board’s elegant extensibility is a good match for the sensor’s impressive capabilities! Fully open and coupled with 3D printable stand files, this alone makes for an air quality hub fit for a hacker’s desk. Given such a sensor, you can measure VOCs and NOCs (Volatile and Non-Volatile Organic Compounds), as well as PM1, PM2.5, PM4 and PM10 particulate matter indices, with temperature and humidity sensing thrown in for good measure. If you just want to test the fan you can poke a couple of wire wrap wires in there, but that's likely to come apart, so only do it with a power supply that can tolerate a short circuit.Ever wanted an indoor environment sensor that’s dead simple yet a complete package? That’s the anotter-sensor-hub project from, designed for the Sensirion SEN05x series sensors, with a SEN055 sensor shown in the picture above. Realistically, just cut off the connector and splice on something more suitable. ![]() You could attempt to solder extremely fine wires to the surface mount contact tails visible in your picture, cover them with tiny heatshrink, etc, but this is likely to be extremely challenging and fragile - you'll need a soldering microscope, and a fair amount of luck and skill to get it done without melting the contacts out of position in the housing. Beware that even if you find the parts for a free hanging micro connector, doing crimps at this tiny scale will be challenging with a universal crimper, while the designed tool could well cost between several hundred and over a thousand dollars. It is not clear that a "free hanging" male pins connector housing exists in this family in the way that they do for some others - for example, free hanging contacts of both genders are relatively well known in the slightly larger 1.25mm Molex picoblade family, and get used a lot as battery connectors for tiny flying toys. The JST SH connector family series is described as a "wire to board" family, and the the male pins connector you picture is is intended for surface mounting to a board.
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