SEN5X docs https://github.com/Sensirion/arduino-i2c-sen5x

Requirement

1. SENS SEN55-SDN-T
2. JST GHR 6 pin cable
3. Arduino Nano Every
4. TTL to RS485, MAX485
5. (optional) USB-RS485-WE

The connection from SEN55 to Arduino

SEN5X	Arduino	Jumper Wire
VCC	5V	Red
GND	GND	Black
SDA	SDA	Green
SCL	SCL	Yellow
SEL	GND for I2C	Blue

The connection from Arduino to TTL to RS485

Arduino	TTL to RS485	Jumper Wire
TX	DI	Green
RX	RO	Orange
D2	DE	Brown
D2	RE	Brown

The connection TTL to RS485 to USB-RS485-WE

TTL to RS485	USB485	Jumper Wire
A	DATA+	Orange
B	DATA-	Yellow

For the 5V supply conect the USB485 GND & 5V to the arduino or use the usb power supply.

Installation

1. Download the latest SensirionI2CSen5x release with Arduino IDE via

   Sketch => Include Library => Manage Libraries => Search for SensirionI2CSen5x and install it

2. Open the arduino_nano_every file within the Arduino IDE

3. Click the Upload button in the Arduino IDE or

   Sketch => Upload

Read the data

• Mode: RTU
• Baudrate: 96000
• Slave ID: 42
• Parity: None
• Data bits: 8
• Stop bits: 8

Holding Register	Data
0x00	PM1
0x01	PM2.5
0x02	PM4
0x03	PM10
0x04	Humidity
0x05	Temperature
0x06	Vox
0x07	Nox
0x08	Error

Troubleshooting

If you want use another Arduino device initialize the RS485Class with the proper serial port.