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Sensirion Raspberry Pi I²C SF06-LF Driver

The repository provides a driver for setting up a sensor of the SF06-LF family to run on a Raspberry Pi over I²C.

<img src="images/sensor_SLF3C_1300F.png" width="300px">

Click here to learn more about the Sensirion SF06-LF sensor family.

Not all sensors of this driver family support all measurements. In case a measurement is not supported by all sensors, the products that support it are listed in the API description.

Supported sensor types

Sensor nameI²C Addresses
SLF3C-1300F0x08
SLF3S-1300F0x08
SLF3S-0600F0x08
SLF3S-4000B0x08
LD20-0600L0x08
LD20-2600B0x08

The following instructions and examples use a SLF3C-1300F.

Connect the sensor

Your sensor has 4 different connectors: SDA, VDD, GND, SCL. Use the following pins to connect your SF06-LF:

SF06-LFCable ColorRaspberry Pi
SDAgreenPin 3
VDDredPin 1
GNDblackPin 6
SCLyellowPin 5
<img src="images/raspi-i2c-pinout-3.3V.png" width="400px">

Detailed sensor pinout

<img src="images/SLF3x_Pinout.png" width="300px">
PinCable ColorNameDescriptionComments
1NCDo not connect
2greenSDAI2C: Serial data input / output
3redVDDSupply Voltage3.2V to 3.8V
4blackGNDGround
5yellowSCLI2C: Serial clock input
6NCDo not connect

Quick start example

Troubleshooting

Building driver failed

If the execution of make in the compilation step 3 fails with something like

 make: command not found

your RaspberryPi likely does not have the build tools installed. Proceed as follows:

$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get install build-essential

Initialization failed

If you run ./sf06_lf_i2c_example_usage but do not get sensor readings but something like this instead

Error executing stop_continuous_measurement(): -1
Error executing read_product_identifier(): -1
Error executing start_h2o_continuous_measurement(): -1
...

then go through the below troubleshooting steps.

Missing I²C permissions

If your user is missing access to the I²C interface you should first verfiy the user belongs to the i2c group.

$ groups
users input some other groups etc

If i2c is missing in the list add the user and restart the Raspberry Pi.

$ sudo adduser your-user i2c
Adding user `your-user' to group `i2c' ...
Adding user your-user to group i2c
Done.
$ sudo reboot

If that did not help you can make globally accessible hardware interfaces with a udev rule. Only do this if everything else failed and you are reasoably confident you are the only one having access to your Pi.

Go into the /etc/udev/rules.d folder and add a new file named local.rules.

$ cd /etc/udev/rules.d/
$ sudo touch local.rules

Then add a single line ACTION=="add", KERNEL=="i2c-[0-1]*", MODE="0666" to the file with your favorite editor.

$ sudo vi local.rules

Contributing

Contributions are welcome!

We develop and test this driver using our company internal tools (version control, continuous integration, code review etc.) and automatically synchronize the master branch with GitHub. But this doesn't mean that we don't respond to issues or don't accept pull requests on GitHub. In fact, you're very welcome to open issues or create pull requests :)

This Sensirion library uses clang-format to standardize the formatting of all our .c 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 *.c *.h

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

License

See LICENSE.