Exercises on dust sensors

Exercise 1: The Plantower sensor

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.

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

-- %USERSIG{UliRaich - 2022-09-09}%

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