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This product supports 5V power supply voltage, output signal TTLIs 5V, higher than this voltage, the product will burn out,Please remember!This product uses the principle of laser scattering and can obtain the concentration of suspended particles in the air of 0.3 to 10 microns.Remarks: The pitch of the interface is 2.54, and the 90-degree pin interface is used without special instructions;Product specificationProduct size: L*W*H=71*70*23mmProtocol :Serial communication protocol: 9600 8N1. (Rate 9600, data bit 8, no parity bit, 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 packet header AA1 Instruction 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 Trailer ABChecksum: the sum of bytes from data 1 to data 6.PM2.5 data content: PM2.5(ug/m3) = ((PM2.5 high byte*256) + PM2.5 low wordSection)/10PM10 data content: PM10(ug/m3) = ((PM10 high byte*256) + PM10 low byte)/101. First install the USB to TTL driver software;2. USB to TTL serial cable, connect PM2.5 sensor, plug in computer;3. After power on, open the serial port debugging assistant software, select the serial port used by the USB to TTL serial line, and use the baud rate of 9600. The SDS011 using principle of scattering,can get the particle concentration between 0.3 to 10um in the air.It with digital output and built-in fan is stable and reliable. Accurate and Reliable: detection, stable, good consistency;Quick response: response time is less than 10 seconds when the scene changes. Easy integration: UART output (or IO output can be customized), fan built-in;High resolution: resolution of 0.3ug/m3. Scope of application:PM2.5 Detector;Purifier;Air Exchangers;Filtering system. Working principle:Using scattering principle:Light scattering can be induced when particles go through the detecting area;The scattered light is transformed into electrical signals and these signals will be amplified and processed ASIN B0899V46SS Alarm Audible Brand DEVMO Unit Count 1.0 Count Item Weight 0.09 Kilograms Manufacturer DEVMO Model Number SM498-SDS011-PM2.5 Power Source Corded Electric Product Style Compact Enclosure Material copper Operating Humidity 95 percent Upper Temperature Rating 90 Degrees Celsius