The Honeywell HPM Series Particle Sensor is a laser-based sensor which uses the light scattering method to detect and count particles in the concentration range of 0 µg/m3 to 1,000 µg/m3 in a given environment. A laser light source illuminates a particle as it is pulled through the detection chamber. As particles pass through the laser beam, the light source becomes obscured and is recorded on the photo or light detector. The light is then analyzed and converted to an electrical signal providing particulate size and quantity to calculate concentrations in real time. The Honeywell particle sensor provides information on the particle concentration for given particle concentration range. This unit is rumored to provide a long life of 20,000 hours of continuous use. Essentially, this equates to seven years of product life (based on eight hours of operation per day).
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I'm using this with an Adafruit M4 and it works well. I connected the serial output to the RX. Note that this sensor requires 5V but returns 3.3, that's the way it is these days. You may need a level shifter if you're using an Arduino. This supposedly will work with an FTDI cable, so you could just plug it into your laptops USB. I did not try this. This is a commercial/industrial product so it's pretty 'skookum' as they say. It's the same sensor (as far as I can tell) that is used in the PurpleAir products. They use two to make sure it's working right. Anyway, it's a nice sensor for a home project if you live in NorCal where the air is 'iffy' at best right now. I know others that have used this with linux type sbc but I did not try this. Again, since it's UART it can talk to about anything. The refresh time is fast. Just make sure you're not blocking the intake vents. The datasheets are good to explain this.
This device works fine over UART and requires very littler interfacing (when you power it up, it starts emitting readings over serial unprompted).
It's uncharacteristic and disappointing that Sparkfun sells this without making its (required) connector/pigtail available - I took a risk on following one of the links in the comments and buying a couple of different connectors from Mouser (luckily, one worked).