Panasonic Laser PM2.5 (Dust/Smoke) Sensor w/ MCU question

RE: Panasonic Laser PM2.5 (Dust/Smoke) Sensor w/ MCU question

rscasny — Tue, 11 Jan 2022 16:34:32 GMT

Gene, this is the response Panasonic provided me:

Please see the below feedback from our engineer.

the maximum concentration that can be read out through I2C is 9.999 ug / m3 (this is what X.XXX ug / m3 stands for). However, the accuracy is guaranteed from 35 to 1.000 (in words: thousand) only.

This is the Arduino code used by the factory evaluation kit. It’s intended for internal use only. It’s a basic implementation of the I2C communication protocol that reads the sensor’s registers and writes their contents to the console. We have used it to write application examples for Arduino and MBED.

Using electronic cigarettes and solder flux fumes we managed to get readings in the range of 2.000 to 7.000 ug / m3.

RE: Panasonic Laser PM2.5 (Dust/Smoke) Sensor w/ MCU question

rscasny — Sun, 09 Jan 2022 22:57:43 GMT

Gene,

I'll pass on your question to Panasonic.

Randall

RE: Panasonic Laser PM2.5 (Dust/Smoke) Sensor w/ MCU question

BigG — Sun, 09 Jan 2022 18:42:22 GMT

I've not evaluated as yet.

RE: Panasonic Laser PM2.5 (Dust/Smoke) Sensor w/ MCU question

karthikrajagopal — Sun, 09 Jan 2022 04:17:13 GMT

I had the same issue while testing it. Only after experimenting , I found out that the lower byte represents concertation values from 0 to 255..anything above that value will be added in the higher byte. Mathematically it can be expressed as (255* Higher Byte) + Lower Byte. The Lower and higher byte I refer to here are the LH and LL. HH and HL won't have any significance (As of UART) as it would result in values that are greater than 2000 ug/m3.

RE: Panasonic Laser PM2.5 (Dust/Smoke) Sensor w/ MCU question

dwinhold — Sun, 09 Jan 2022 00:28:45 GMT

I’ve been using I2C and receiving numbers between 1200 to 3700 and higher. I’ll upload everything tomorrow in detail.

Dale