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, PM10 Range: 0.0-999.9 micrograms per cubic meter Supply voltage: 5V Maximum working current : 100mA Sleep current: 2 mA Working temperature range: -20℃-50 ℃ Response time: 1 second Serial data output frequency once per second Particle diameter resolution of 0.3 micrometers Relative 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 seconds Data frame (10 bytes): message header+instruction number+data (6 bytes)+checksum+message tail Byte Number Name Remarks 0 message header AA Instruction number C0 2 Data 1 PM2.5 Low Byte 3 Data 2 PM2.5 High Byte 4 Data 3 PM10 Low Byte 5 Data 4 PM10 High Byte 6 Data 5 0 (Reserved) 7 Data 6 0 (Reserved) 8 Checksum Checksum 9 Message Tail AB PM10 data content: PM10 (/m³)=((PM10 high 256)+PM10 low byte)/10 1. 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 Shown Material:plastic Package Contents: 1 x Particle Matter Sensor Only 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.