Sensirion I²C SFM3304 Arduino Library

This is the Sensirion SFM3304 library for Arduino allowing you to communicate with a SFM3304 sensor over I²C.

Click here to learn more about the Sensirion SFM3304 sensor.

The default I²C address of SFM3304 is 0x2E.

Installation of the library

This library can be installed using the Arduino Library manager: Start the Arduino IDE and open the Library Manager via

Sketch ➔ Include Library ➔ Manage Libraries...

Search for the Sensirion I2C SFM3304 library in the Filter your search... field and install it by clicking the install button.

If you cannot find it in the library manager, download the latest release as .zip file and add it to your Arduino IDE via

Sketch ➔ Include Library ➔ Add .ZIP Library...

Don't forget to install the dependencies listed below the same way via library manager or Add .ZIP Library

Dependencies

• Sensirion Core

Connect the sensor

Use the following pin description to connect your SFM3304 to the standard I²C bus of your Arduino board:

Pin	Cable Color	Name	Description	Comments
1		NC	Do not connect	Ground for the heater
2	red	VDD	Supply Voltage	3.15V to 3.45V
3	yellow	SCL	I2C: Serial clock input
4	black	GND	Ground
5	green	SDA	I2C: Serial data input / output
6		NC	Do not connect	Supply voltage to the heater

The recommended voltage is 3.3V.

Board specific wiring

You will find pinout schematics for recommended board models below:

Arduino Uno

SFM3304	SFM3304 Pin	Cable Color	Board Pin
VDD	2	red	3.3V
SCL	3	yellow	D19/SCL
GND	4	black	GND
SDA	5	green	D18/SDA

Arduino Nano

SFM3304	SFM3304 Pin	Cable Color	Board Pin
VDD	2	red	3.3V
SCL	3	yellow	A5
GND	4	black	GND
SDA	5	green	A4

Arduino Micro

SFM3304	SFM3304 Pin	Cable Color	Board Pin
VDD	2	red	3.3V
SCL	3	yellow	~D3/SCL
GND	4	black	GND
SDA	5	green	D2/SDA

Arduino Mega 2560

SFM3304	SFM3304 Pin	Cable Color	Board Pin
VDD	2	red	3.3V
SCL	3	yellow	D21/SCL
GND	4	black	GND
SDA	5	green	D20/SDA

ESP32 DevKitC

SFM3304	SFM3304 Pin	Cable Color	Board Pin
VDD	2	red	3V3
SCL	3	yellow	GPIO 22
GND	4	black	GND
SDA	5	green	GPIO 21

Quick Start

1. Install the libraries and dependencies according to Installation of the library

2. Connect the SFM3304 sensor to your Arduino as explained in Connect the sensor

3. Open the exampleUsage sample project within the Arduino IDE:

   File ➔ Examples ➔ Sensirion I2C SFM3304 ➔ exampleUsage

4. Click the Upload button in the Arduino IDE or Sketch ➔ Upload

5. When the upload process has finished, open the Serial Monitor or Serial Plotter via the Tools menu to observe the measurement values. Note that the Baud Rate in the used tool has to be set to 115200 baud.

Contributing

Contributions are welcome!

This Sensirion library uses clang-format to standardize the formatting of all our .cpp and .h files. Make sure your contributions are formatted accordingly:

The -i flag will apply the format changes to the files listed.

clang-format -i src/*.cpp src/*.h

Note that differences from this formatting will result in a failed build until they are fixed. :

License

See LICENSE.