Difference: AirQuality (1 vs. 2)

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Exercises on dust sensors

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Exercise 1: The Plantower sensor

 
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Article text.
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The Plantower sensor comes with a flat cable with alternating red and black color. I soldered a female Dupont cable to its end. The colors in the table below correspond to the colors of my Dupont cable.
 
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Pin 1 is on the right-hand side of the connector on the sensor.

plantowerConnector.png

Connections:

PlanTower Pin !WeMos bus color of Dupont cable
1: Vcc 5V green
2: GND GND blue
3: set nc violet
4: Rx D2: GPIO 22 gray
5: Tx D1_ GPIO 21 white
6: RESET RST black
7: nc    
Connect the Plantower sensor to the ESP32 according to the table above. Create a serial connection on UART 2 with rx on pin 22 and tx on pin 21.

Read messages from the Plantower sensor and print them.

Exercise 2:

Write a function decoding the message.

  • Make sure to find the start characters.
  • Get the frame length and print it.
  • Calculate the checksum and print it together with the checksum in the message. Compare them and make sure they are equal
  • Print the measurement results
 -- Uli Raich - 2022-09-09

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META FILEATTACHMENT attachment="plantowerConnector.png" attr="" comment="" date="1662820514" name="plantowerConnector.png" path="plantowerConnector.png" size="1362589" user="UliRaich" version="1"

Revision 12022-09-09 - UliRaich

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META TOPICPARENT name="Exercises"

Exercises on dust sensors

Article text.

-- Uli Raich - 2022-09-09

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