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Hello. I would like to ask something related to the screenshot in Step 4. May I know what is the unit for the PM2.5 in your screenshot? The data sheet for SDS021 says that the range of measurement that can be recorded using the sensor is within 0.0-999.9 μg /m3. Is your reading within that range? Thank you.
Conclusion & Going Further
Tools and Materials for Arduino
Welcome to Arduino
Hello. I am a newbie and I have 1 question. I would like to install 8 x temperature sensors AND 8 x humidity sensors in a room. Instead of using 4 sets of Raspberry Pis (each Pi connected to 2 x DHT22), is it possible to connect 8 x DHT22 to only 1 Raspberry Pi? Otherwise I think I've to spend more money to buy extra Raspberry Pi for every pair of DHT22. Thank you.
Tools and Supplies
Raspberry Pi Class
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