benlemasurier / sps30

Control program for the senirion sps30 particle matter sensor (I2C interface) WIP

sps30

Control program for the senirion sps30 particle matter sensor (I²C interface)

Hardware/OS

• Raspberry Pi (Zero/w)
• Sensirion SPS30
• Raspbian Stretch Lite (version: Nov 2018)

Pi - I²C (Inter-Integrated Circuit / i2c)

activate i2c with the raspi-config

sudo raspi-config

enter rapsi config menu navigate to 5. Interfacing Options

go to P5 I2C and enable it

double check the config.txt

in /boot/config.txt

Add the correct clock rate for 200kHz.
(NOTE: rPI clock speed is CPU bound and very inaccurate so i set it to 230000)

dtparam=i2c_arm=on
dtparam=i2c_arm_baudrate=230000

GPIO Pins

NOTE: powering off the PI before connect the cables to the GPIO.
NOTE: i2c is not suitable for long wirings keep the wires as short as possible (not longer than 10cm / 4inches)

Test

install i2c-tools via apt:

sudo apt update
sudo apt install i2c-tools

after that, check if the sensor is reachable:

i2cdetect -y 1

the output should look like this:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- 69 -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --  

0x69 is the i2c address from the sps30 - sensor

Libaries

• libcurl-dev

we just need the <curl/curl.h>

sudo apt-get install libcurl4-openssl-dev

Compile

execute the build script

./build

Execute

The final binary is ./bin/sps30

[TODO: add more here]