air quality sensor
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JINAN RAINBOW TECHNOLOGY CO., LTD. Multi-in-one Air Quality Sensor PN : RK207 Table of Contents 1.Product description 2.The characteristic of sensor 3.Main application 4.Technique target 5.Output data 6.Internal architecture description 7.Pin name 8.Typical application circuit 9. Temperature influence curve 10.Temperature and humidity sensor performance graphs 11.Reliability test on sensor 12.Communication command 13.External dimension 14.Packing scheme 15.Model naming rules

1. Product description RK207 Sensor is a multi-sensor which can simultaneously monitor the concentration of particulate matter, formaldehyde, temperature and humidity in the air. Based on the principle of laser scattering, the monitoring of particulate matter concentration can continuously collect and calculate the number of suspended particulate matter with different particle sizes in the air per unit volume, that is, the distribution of particulate matter concentration, and then convert it into mass concentration. The monitoring of formaldehyde concentration is based on the principle of...

*NB: Sensor performance tested under standard conditions of 293K, 1atm., 35%RH. Sensors are best stored at 20°C in sealed plastic bags for maximum storage life. 3

5. Output data The main outputs are the mass per unit volume of particulate matter and its quantity， Where the number of particles per unit volume is 0.1 liters. Output temperature, the unit is: ℃ Output humidity, units: % RH 6. Internal architecture description Picture 1. Internal configuration According to above Block Diagram, the light source of RK207 is consist of fan for particle sampling, laser diode for particle detection, photodiode for scattered laser signal, Amp for signal amplification the detecting part is consist of light sensitive part which receives reflected light and...

Picture 2 Pin definitions of digital interfaces Table2 PIN1 Negative power supply Negative power supply Module reset signal/TTL @3.3V，Low reset Serial receive pin/TTL @3.3V Serial send pin/TTL @3.3V Set pin /TTL @3.3V High voltage or floating for the normal working state, low voltage for the sleep state Note: SET=1 refers to adaptive sampling method based on module operation, the response time shall less than 500ms. The updated time should under1s.SET=0 refers to the module enters in standby mode.

The part name of the PIN foot is Jane Cattle, as shown in the figure below: Picture3 Diagrammatic sketch of Jane cattle The steak mothers are divided into plug-in type and SMT type corresponding to Jane Cattle, as shown in the figure below:

Picture 4 Diagrammatic sketch of mother seat (Plug-in) Picture 5 Diagrammatic sketch of mother seat (SMT) Typical application circuit Case 1. UART application

Picture 6 Case 2. I2C application Note of circuit design ： ※ The supply source of RK207 should be 5V，since fan should be driven by 5V supply. The other data communication and controlled pin need 3.3V as high level. So, the main board MCU which communicate with sensor should be 3.3 communication level. If main board MCU is 5V communication level, then should add an external 5V switch to 3.3V level on the communication pin (RX, TX) and controlled pin (SET, RESET), to switch components and circuit.

Picture 8 ※ UART communication is compatibility with 3.3V and 5V level. ※ There is pull-up resistor inside the SET and RESET. No matter there is signal input or not, these two pins will work normally. If they are not useful for you, keep it hung. 9. Temperature influence curve

^Humidity Sensor Performance Graphs Temperature (°C) Figure 3 Typical tolerance of RH over T ^Temperature Sensor Performance Graphs

12. Communication command The baud rate is 9600, check bit: no, stop bit: 1 bit. the command line formats are as follows: Data Definition Start symbol1 Start symbol2 Frame length high eight-digit Frame length low eight-digit Data1 high eight-digit Data1 low eight-digit Data2 high eight-digit Data2 low eight-digit Data3 high eight-digit Data3 low eight-digit Data4 high eight-digit Data4 low eight-digit Data5 high eight-digit Data5 low eight-digit Data6 high eight-digit Data6 low eight-digit Data7 high eight-digit Data7 low eight-digit Data8 high eight-digit Data8 low eight-digit Data9 high...

Start symbol1 Start symbol2 Frame length high Frame eight-digit eightlength low digit Data1 high eight-digit Data1 low eight-digit Data2 high eight-digit Data2 low eight-digit Data3 high eight-digit Data3 low eight-digit Data4 high eight-digit Data4 low eight-digit Data5 high eight-digit Data5 low eight-digit Data6 high eight-digit Data6 low eight-digit Data7 high eight-digit Data7 low eight-digit Data8 high eight-digit Data8 low eight-digit Data9 low eight-digit Data10 high eight-digit Data10 low eight-digit Data11 high eight-digit Data11 low eight-digit Data12 high eight-digit Data12 low...

15. Model naming rules FS X I: I2C U: UART P: PWM Country Structure code codenumberst ructure code Laser dust series Short for Fosensor The sensor must be installed vertically, ensuring both the inlet and outlet keep unobstructed,avoiding strong airflow as well. Away from the artificial airflow, such as fans, such as when used for air refresher, the front and rear of the fan can not be installed, can be installed on one side of the shell, but the shell to retain the vents to ensure that the external airflow can flow in. Keep viscous particles, such as oil, away from entering the sensor in...

placement will cause the sensor zero to drift. As far as possible in the normal temperature and humidity of clean air environment custody.  Correct installation position as below for reference: