This product supports 5V power supply voltage and TTL output signal,If the voltage is higher than 5V, the product is prone to burning out, please remember!Detecion Range:By using the principle of laser scattering, the concentration of suspended particles in the air ranging from 0.3 to 10 microns can be obtained.Measure and output PM2.5, PM10Range: 0.0-999.9 micrograms per cubic meterSupply voltage: 5VMaximum working current : 100mASleep current: 2 mAWorking temperature range: -20-50 Response time: 1 secondSerial data output frequency once per secondParticle diameter resolution of 0.3 micrometersRelative error 10%Communication protocol:Serial communication protocol: 9600 8N1. (Speed 9600, data bit 8, check bit none, stop bit 1)Serial port reporting communication cycle: 1+0.5 secondsData frame (10 bytes): message header+instruction number+data (6 bytes)+checksum+message tailByte Number Name Remarks0 message header AAInstruction number C02 Data 1 PM2.5 Low Byte3 Data 2 PM2.5 High Byte4 Data 3 PM10 Low Byte5 Data 4 PM10 High Byte6 Data 5 0 (Reserved)7 Data 6 0 (Reserved)8 Checksum Checksum9 Message Tail ABPM10 data content: PM10 (/m)=((PM10 high 256)+PM10 low byte)/101. Install the USB to TTL driver software first;2. USB to TTL serial cable, connect PM2.5 sensor, plug in computer;3. After powering on, open the serial port debugging assistant software, select the serial port used for USB to TTL serial cable, and use a baud rate of 9600.Colour:As ShownMaterial:plasticPackage Contents:1 x Particle Matter SensorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.