Reference

Library

• DFRobot RGB LCD

Communication Protocol Description

• Operating Voltage: 5.0VDC
• Data Interface Level: L<0.8V, H>2.7V, Max 3.3V
• Serial Baud Rate: 9600bps

Principle

As the particle (PM10, PM2.5 & PM1.0) concentration sensor it can use laser scattering to continuously collect and calculate the number of multi-sized suspended particles per unit of air volume, i.e. particle concentration distribution, and then convert to mass concentration. Also, it embeds in it a one-chip sensor for accurate temperature and humidity measurements.

Other Supplementary Information

• 1.The metal shell is connected to the internal power ground. Please note that don’t short-circuit it with other external board circuit or chassis shell.
• 2.The best installation method is to tight connect the plane of air inlet and outlet with the user machine's inner wall (where there are holes for airflow). If this method is impossible to use, make sure there is no obstacles within 2cm of the air outlet, and there should be a structure between the air inlet and the outlet to avoid airflow inside the user machine from the outlet back to the inlet.
• 3.The vent for air inlet on the user machine’s inner wall should not be smaller than air inlet.
• 4.When it's applied to purifiers or similar, try to avoid placing the sensor directly in the air duct of the purifier; if unavoidable, set up a separate structure for placing the sensor to isolate it from the air duct.
• 5.When used with purifiers or fixed detection equipment, the sensor should be placed 20cm higher than the ground. Otherwise, it may be impeded by large dust particles or even flocs near the ground and stop working.
• 6.When the sensor is applied to outdoor fixed equipment, the protection against sandstorms, rain, snow, catkins, etc. should be completed by the equipment.
• 7.The sensor is an integral component, so please don’t disassemble it even the metal shielding shell in case there are irreversible damages.
• 8.Fix the bottom of the sensor with 2mm self-tapping screws, and the length of the screws into the shell should be no more than 5mm.