PMSA003 PM2.5 Sensor Laser Dust Sensor PM2.5 Detector Air Quality Sensor For Portable Devices

PMSA003 PM2.5 Sensor Laser Dust Sensor PM2.5 Detector Air Quality Sensor For Portable Devices

Main Characteristics:
- Laser scattering principle realizes accurate measurement
- Zero error alarm rate
- Real-time response and support continuous acquisition
- Minimum resolution particle size 0.3μm
- Brand-new patented structure, six-sided all-round shielding, stronger anti-interference performance
- The direction of air inlet and outlet is optional, and the scope of application is wide, and the user does not need to design the air duct anymore
- Ultra-thin and ultra-small design, only 12 mm, suitable for portable and wearable devices

Overview:
PMSA003 is a digital and universal particle concentration sensor, which can be used to obtain the number of suspended particles in the air, i.e. the concentration of particles, and output them in the form of digital interface. This sensor can be inserted into variable instruments related to the concentration of suspended particles in the air or other environmental improvement equipment to provide correct concentration data in time.

Working Principle:
Laser scattering principle is used for such sensor, i.e. produce scattering by using laser to radiate suspending particles in the air, then collect scattering light in a certain degree, and finally obtain the curve of scattering light change with time. In the end, equivalent particle diameter and the number of particles with different diameter per unit volume can be calculated by microprocessor based on MIE theory. Please find the functional diagram of each part of sensor from Figure 1 as follows.


Technical Index:



Output Result:
Mainly output as the quality and number of each particles with different size per unit volume, the unit volume of particle number is 0.1L and the unit of mass concentration is μg/m³.

There are two options for digital output: passive and active. Default mode is active after power up. In this mode sensor would send serial data to the host automatically. The active mode is divided into two sub-modes: stable mode and fast mode. If the concentration change is small the sensor would run at stable mode with the real interval of 2.3s.And if the change is big the sensor would be changed to fast mode automatically with the interval of 200~800ms, the higher of the concentration, the shorter of the interval.

Pay Attention to Circuit Design:
1. PMSA003 needs 5V power supply, this is because fan needs 5V drive. But other data communications and control pins all need 3.3V as high level. Therefore, the motherboard MCU connected to it should be 3.3V power supply. If the motherboard MCU is powered by 5V, a level conversion chip or circuit should be added to the communication lines (RXD, TXD) and control lines (SET, RESET).
2. SET and RESET have internal pull-up resistors. If they are not used, they should be left floating.
3. PIN6 and PIN8 are used for internal debugging of the program and should be left floating in the application circuit.
4. Pay attention when applying the sleep function: the fan stops working during sleep, and it takes at least 30 seconds to stabilize the fan to restart. Therefore, in order to obtain accurate data, the sensor working time should not be less than 30 seconds after sleep wakeup.

Installation Precautions:
1. The metal shell is connected to the internal power ground. Be careful not to short-circuit with other external board circuit or chassis shell.
2. The plane where the air inlet and outlet are located is close to the air holes on the inner wall of the user's machine and the outside world is the best installation method. If this is not possible, there is no block within 2cm of the air outlet. There should be a structure between the air inlet and the air outlet to isolate the air flow and avoid the air flow from the air outlet to the air inlet directly inside the user machine.
3. The ventilation hole on the inner wall of the user machine for the air inlet should not be smaller than the size of the air inlet.
4. When applied to purifier products, try to avoid placing the sensor directly in the air duct of the purifier. If it is unavoidable, set up a separate structural space and place the sensor in the air duct of the purifier. isolation.
5. When used with purifiers or fixed detection equipment, the sensor position should be more than 20cm above the ground. Otherwise, it may be contaminated by large dust particles or even flocs near the ground, causing the fan to wind up and stop rotating.
6. When the sensor is used in outdoor fixed equipment, the protection of sandstorms, rain and snow, and willow catkins should be completed by the equipment.
7. The sensor is an integral component, the user should not disassemble it, including the metal shielding shell, to prevent irreversible damage.

Other Precautions:
1. This sensor data ensures the consistency between the factory individuals, and does not use third-party testing instruments or data as comparison standards. If the user wants the final measurement result to be consistent with a third-party testing equipment, the user can perform data fitting based on the actual collection result.
2. This sensor is suitable for ordinary indoor environment. If the user equipment is used in the following actual environments, corresponding protective measures should be added to the sensor, otherwise, excessive dust, oil, and water may cause data consistency to decrease:
a) The annual dust concentration is greater than 300 micrograms/cubic meter for more than 50% of the time, or greater than 500 micrograms/cubic meter for more than 20% of the time, such as a smoking room;
b) Fume environment, such as kitchen;
c) High water fog environment, such as hot springs and bathrooms;
d) Outdoor.

Package Included:
- 1 x Set of PM2.5 Sensor