DEVMO Digital Particle Concentration Laser Sensor PMS5003 PM2.5 PM10+Cable Air Quality Detection Dust Air Conditioning Monitor Module Compatible With Ar-duino

I had one of my Purple Air PA-II sensors go bad -- I couldn't really decide which one it was, just that the two sensors in it had diverged from one another. Cleaning the sensors didn't help, so I decided to replace both.I liked that these sensors came as a pair, as I hoped that they were very close to each other in time of manufacture, and would work very similarly to each other. Looking at serial numbers, the devices delivered to me were made on the same day (2022/04/09), and were 270 units apart in production order.I disassembled my PA-II (which was an older unit not designed for user replacement) with no difficulty, removed the old sensors, and installed the two new ones. After reassembly, the PA-II powered up with no issues.I did notice at first that the new sensors were reading farther apart than I expected, but over the course of the next few days, the difference closed. Now, they read right on top of one another, just differing in random noise. My statistics are showing an average of 0.3 ug/dl difference between the two sensors over time.I certainly have no scientific way to calibrate them, but both devices are reading in-line with other AQ sensors in my area.

While this comes with a cable (thank you) it does not come with a header board for the cable to plug into. Compare this to the same product over at Adafruit where it does come with a header board. My inelegant solution to this (given the very small connector) was to cut the cable in half and then crimp male breadboard connectors on. It is now connected to an ESP32 board running ESPHome and reporting data for the house.So -1 star for the lack of header board. Given how long it took me to crimp those male connectors together, I'd be happy to pay a bit more for the board.

I connected this (5V, GND, Rx, Tx) to an ESP32-S2 mini running Tasmota. It immediately recognized the device, and displayed the particulate counts. Using gnuplot, I can get nice graphs of the levels over time. If you're using Tasmota on an ESP32, remember to use the sensor18 command to set the sample time (e.g., 'sensor18 120' for a sample every 2 minutes). This dramatically extends the life of the device, which would otherwise be limited to 30,000 hours (~3.5 years).

Have bought a few of these to monitor conditions and have been excellent

Needed to replace the one in my Shark air cleaner. This had the same part number but the wrong connector.

Very nice sensor. Very sensitive to air quality; I can detect the furnace blower turning on, something frying in the kitchen, and definitely incense burning from across the house.Also super easy to integrate with microcontrollers; I have mine on an ESP8266 sending the particle counts to a website via WiFi. Very happy with this.The design is also good; and there is an internal fan consistently pulling the air samples through the laser; I feel this make for much more consistent data that some other passive particle monitors.

Fan spins readings were all 0, then suddenly it started working, then 0 again. Got a replacement, and nothing but 0s again.

This has the same sensor chip, but I wasn't sure it would work but it does. Happy to have it cheaper, faster, and fewer dinosaurs burned shipping it to me.