Difference: AirQuality (1 vs. 2)

Revision 22022-09-10 - UliRaich

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META TOPICPARENT	name="Exercises"

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.

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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