SPECIFICATION Product Name: Laser Particle Sensor Module Item No.: PM2105-M Version: V0.3 Date: June 3, 2020

Laser Particle Sensor Module PM2105-M Applications ▪ Air purifier ▪ Air quality monitor ▪ Air conditioner ▪ Ventilation system ▪ Consumer electronic products ▪ Environmental monitoring ▪ Description PM2105-M is a laser particle sensor module for indoor use based on laser scattering technology. This sensor can measure particle concentration size between 0.3μm~10μm exactly and output particle mass concentration PM1.0, PM2.5, PM10 in μg/m³ directly via mathematical algorithm and scientific calibration. ▪ The smallest size of available measurement: 0.3μm ▪ Real-time output PM1.0, PM2.5, PM10 in μg/m3...

Internal Architecture Description When the fan works, it will generate airflow. When the particles in the sampled gas pass through the beam of the light source (laser), a light scattering phenomenon occurs, and the scattered light is converted into an electrical signal (ie, a pulse) by the photoelectric transformer. The larger the particle size, the larger the amplitude of the pulse signal outputs. The number of particles of different sizes is calculated by comparing the peak value with the predetermined threshold value, and the mass concentration value is obtained by a professional algorithm....

The interface connector is located at the side of the sensor. Corresponding female plug part number is SM08B-GHS-TB from JST. The pitch is 1.25mm. The connection cable with female connector at both ends can also be customized.

Typical Application Circuit Case 1. UART Application 5V-3.3V Level Shift, RX, TX Level Shift

Temperature Influence Curve Particle measured error: under 25±2℃, 0~1,000μg/m³, consistency and accuracy of PM1.0/PM2.5 is either ±15% reading or ±15μg/m³, the bigger one is considered. Temperature influence coefficient: 0.5%/℃ ~ 1%/℃ or 0.5μg/m³/℃ ~ 1μg/m³/℃, the bigger one is considered.

Product Installation ▪When install PM2105-M sensor module in your system or equipment, please make sure that the air inlet and air outlet are unobstructed. And there is no huge airflow face to air inlet and air outlet. ▪In order to avoid dust deposition on the surface of sensitive component (laser diode and photosensitive diode), which may affect the measurement accuracy of the sensor, the appropriate installation ways are recommended as below. Recommended Installation Cross section Photosensitive diode surface

User Attention ▪The best installation way is to make the surface of air inlet and outlet of the sensor clings to the air vent in the inner wall of the user device that communicates with the outside. If it’s not possible, then an air isolation structure between air inlet and air outlet is necessary to avoid the air back flow in the user’s device. ▪Air vent size on the internal wall of user’s device for airflow should be bigger than the size of air inlet of the sensor. ▪For purification products, sensor cannot be installed in the purifying air duct. If it’s not possible, it’s necessary to design...

1) The data in this protocol is all hexadecimal data. For example,“46” for decimal [70]. 2) [xx] is for single-byte data (unsigned, 0-255); for double data, high byte is in front of low byte. 3) Baud rate: 9600; Data Bits: 8; Stop Bits: 1; Parity: No 4) It is default by continuous mode after powering on. Working mode will not be saved after powering off. Sending format of software:

4.1 Read Particle Measurement Result Send: 11 02 0B 07 DB Response: 16 35 0B DF1- DF52 [CS] Function: Read concentration of particle and particles number. Note: Read particle concentration (ug/m3) and particles number (pcs/0.1L) PM1.0 GRIMM mass concentration = DF1*256A3 + DF2*256A2 + DF3*256A1 + DF4 PM2.5 GRIMM mass concentration = DF5*256A3 + DF6*256A2 + DF7*256A1 + DF8 PM10 GRIMM mass concentration = DF9*256A3 + DF10*256A2 + DF11*256A1 + DF12 PM1.0 TSI mass concentration = DF13*256A3 + DF14*256A2 + DF15*256A1 + DF16 PM2.5 TSI mass concentration = DF17*256A3 + DF18*256A2 + DF19*256A1 + DF20...

// Close particle measurement Response: 16 02 0C 01 DB// module is under particle measurement closed status 4.3 Set up and Read Particle Measuring Time Send: 11 03 0D DF1 DF2 [CS] Send: 11 01 0D E1 // Set up particle measuring time // Read particle measuring time Response: 16 03 0D DF1 DF2 [CS] Function: Read particle measuring time Note: 1. Particle measuring time = DF1*256+DF2, unit is second. Minimum measuring time is 36 seconds. Time range is 36-65530 seconds. After setting up xx seconds particle measuring time, the sensor will stop working first, then you can send “Open” command to start...

Send: 11 03 05 02 05 E0 // Set up as timing measuring mode, and timing cycle is 517seconds. Response: 16 03 05 02 05 DB // Set up successfully 4.5 Set up Dynamic Measuring Mode Send: 11 02 06 DF1 [CS] // Set up dynamic particle measuring mode Send: 11 01 06 E8 // Read dynamic particle measuring mode Response: 16 02 06 DF1 [CS] Function: Read/set up particle dynamic measuring mode Note: 1. Particle dynamic measuring mode result DF1 2. When DF1=00, close dynamic measuring mode. When DF1=01, start dynamic measuring mode. Dynamic working mode description: After sensors are in dynamic working mode,...

Send: 11 02 06 01 E6 // Set up opening dynamic particle measuring mode Response: 16 02 06 01 E1 // Set up successfully Send: 11 02 06 00 E7 // Set up closing dynamic particle measuring mode Response: 16 02 06 00 E2 // Set up successfully Remark: The module can support 4 kinds of working mode (Single+Continuous+Timing+Dynamic). It can be switched between these 4 kinds of working mode. It is continuous working mode by default after leaving factory. These 4 kinds of working mode can be switched by sending commands, as following: 1. Send: 11 03 0D 00 24 BB // Single measuring mode, time is 36s. After...

a. This is an I2C protocol for PM2105-M. The sensor module is lower computer, which is not able to initiate communication automatically. Communication is initiated via main controlled board, which reads data and Sends control commands. b. Communication clock frequency <=100Khz. START: start signal, send by main controlled board; STOP: stop signal, send by main controlled board; ACK: acknowledge signal, send by the sensor module if in bold; otherwise, send by main controlled board; NACK: non-acknowledge signal, send by the sensor module if in bold; otherwise, send by main controlled board; Px:...