Gravity: PM2.5 Air Quality Sensor data meaning issue
Giovanni.Briguglio 2025-02-04 00:20:20 1253 Views2 Replies Hello,
I bought a Gravity: PM2.5 Air Quality Sensor and I connected it to a Raspberry Pi 4. By means of I2C interface I recognized that there are several addresses from which taking data. I checked the datasheet but I did not find any protocols from which understanding data. I tried one of those addresses but data changes rapidly and greatly… Can you help me to understand how to get the correct values?
Thanks
Have you tried downloading the driver and examples from github?
https://github.com/DFRobot/DFRobot_AirQualitySensor/tree/master
The examples there seem very straightforward, so I would try one.
The initialization code for both examples is the same:
```
I2C_1 = 0x01 # I2C_1 Use i2c1 interface (or i2c0 with configuring Raspberry Pi file) to drive sensor
I2C_ADDRESS = 0x19 # I2C Device address, which can be changed by changing A1 and A0, the default address is 0x54
airqualitysensor = DFRobot_AirQualitySensor(I2C_1 ,I2C_ADDRESS)
```
That should create an object you can query to get measurements.
For example, you might try (in Python)
```
pm1_standard_reading = airqualitysensor.gain_particle_concentration_ugm3(PARTICLE_PM1_0_STANDARD)
print(pm1_standard_reading)
```
Which should give you the sensors reading of that value.
Hope that's helpful.
sean.catheroy PS - You shouldn't need to worry about finding the device on I2C - seems like DFRobot has taken care of that for you if you use the driver they provide.
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