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Overview :
The SM300D2 seven-in-one sensor module is a cost-effective digital serial output sensor module. It uses both RS485 data bus and UART serial port TTL level output modes, collecting CO2, formaldehyde, TVOC, laser PM2.5, PM10, temperature , Humidity in one. It can carry out real-time comprehensive detection of the environment in which it is located, and has good stability.
Features :
● Simultaneous output of carbon dioxide, formaldehyde, TVOC, PM2.5, PM10, temperature, humidity seven sets of data
● High sensitivity and stable data
● At the same time, it adopts two output modes of RS485 bus and UART TTL level, which is convenient for customers to choose and use independently.
● The temperature is accurate to 0.1 ℃, and the humidity is accurate to 0.1% RH
● Automatically output these seven sets of monitoring data via RS485 interface every second
● With power supply anti-reverse protection function
Application :
● Hotel room air quality monitoring
● Environmental monitoring of agricultural greenhouses and outdoor breeding sites
● Fresh air ventilation system
● Air purifier, air conditioner
● Air quality monitoring equipment
● Kitchen and bathroom ventilation control system
● Smart home equipment
Specifications :
| Name | resolution | range | accuracy |
| eCO2 | | 400ppm～5000ppm | ±50ppm |
| eCH2O | 1ug/m3 | 1ug～1000ug | |
| TVOC | 1ug/m3 | 0ug～2000ug | |
| PM2.5 | 0.8ug/m3 | 5ug～1000ug | ±10% |
| PM10 | | 5ug～1000ug | ±10% |
| Temperature | 0.01℃ | -40℃～125℃ | ±0.5℃ |
| Humidity | 0.04% | 0～100% | ±3%RH |
| Physical interface | ZH1.5-4 |
| Output Data | UART-RS485 |
| Operating Voltage | 5.0±0.2VDC |
| Working current | ≤60mA |
| Preheat time | 2 min |
| Operating temperature | 0℃～50℃ |
| Working humidity | ≤95％RH |
| Dimensions | 55.8*50*19.5mm（L×W×H） |
| Service life | 5 years (in the air) |
Sample Data :
For example, if the value read is 3C 02 08 FC 00 79 01 D7 00 13 00 22 1B 03 30 02 18, the following result is obtained:
| Checksum | B17=unit_8(3Ch+02h+08h+0FCh+00h+79h+01h+D7h+00h+13h+00h+22h+1Bh+03h+30h+02h)=18h |
| CO2 | B3*256+B4=08h*256+0FCh=2300ppm |
| eCO2 | B5*256+B6=00h*256+79h=121ug/m3 |
| TVOC | B7*256+B8=01h*256+0D7h=471ug/m3 |
| PM2.5 | B9*256+B10=00h*256+13h=19ug/m3 |
| PM10 | B11*256+B12=00h*256+22h=34ug/m3 |
| Temperature integer | B13=1Bh=27℃ |
| Decimal temperature | B14*0.1=03h*0.1=0.3℃ |
| Humidity integer | B15=30h=48%RH |
| Humidity decimal | B16*0.1=02h*0.1=0.2%RH |
Note:
The CO2 value and CH2O value output by the module are the equivalent values of TVOC. Please pay attention when buying and using.
Package Included:
1 x SM300D2 7-in-1 Sensor Module
1 x Display Board
2 x Connect Cable
