https://github.com/sensirion/raspberry-pi-i2c-sdp
RaspberryPi driver for Sensirion SDP sensors.
https://github.com/sensirion/raspberry-pi-i2c-sdp
differential-pressure raspberry-pi sdp sdp3x sdp800 sdp810 sdp8xx sensirion sensirion-sensor
Last synced: about 2 months ago
JSON representation
RaspberryPi driver for Sensirion SDP sensors.
- Host: GitHub
- URL: https://github.com/sensirion/raspberry-pi-i2c-sdp
- Owner: Sensirion
- License: bsd-3-clause
- Created: 2021-08-31T14:46:04.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2024-05-23T18:20:45.000Z (about 2 years ago)
- Last Synced: 2025-01-10T19:29:48.582Z (over 1 year ago)
- Topics: differential-pressure, raspberry-pi, sdp, sdp3x, sdp800, sdp810, sdp8xx, sensirion, sensirion-sensor
- Language: C
- Homepage:
- Size: 2.94 MB
- Stars: 2
- Watchers: 5
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
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README
# Sensirion Raspberry Pi I2C SDP Driver
This document explains how to set up the SDP sensor to run on a Raspberry Pi
using the provided code.
Click [here](https://sensirion.com/products/catalog/EK-P4/) to learn more about the SDP3x Sensor Evaluation Kit.
Click [here](https://sensirion.com/products/catalog/EK-P5/) to learn more about the SDP8xx series Sensor Evaluation Kit.
## Setup Guide
### Connecting the Sensor
Your sensor has the four different connectors: VCC, GND, SDA, SCL. Use
the following pins to connect your Sdp:
*Sdp* | *Raspberry Pi*
:------: | :------------------:
VCC | Pin 1
GND | Pin 6
SDA | Pin 3
SCL | Pin 5
### Setting sensor address ###
Depending on whether you connect a SDP3x or SDP8xx configure the correct i2c address in sdp_i2c.h (SDP_I2C_ADDRESS).
### Raspberry Pi
- [Install the Raspberry Pi OS on to your Raspberry Pi](https://projects.raspberrypi.org/en/projects/raspberry-pi-setting-up)
- [Enable the I2C interface in the raspi-config](https://www.raspberrypi.org/documentation/configuration/raspi-config.md)
- Download the driver for the [Sensirion Github Page](https://github.com/Sensirion/raspberry-pi-i2c-sdp) and extract the `.zip` on your Raspberry Pi
- Compile the driver
1. Open a [terminal](https://www.raspberrypi.org/documentation/usage/terminal/?)
2. Navigate to the driver directory. E.g. `cd ~/raspberry-pi-i2c-sdp`
3. Run the `make` command to compile the driver
Output:
```
rm -f sdp_i2c_example_usage
cc -Os -Wall -fstrict-aliasing -Wstrict-aliasing=1 -Wsign-conversion -fPIC -I. -o sdp_i2c_example_usage sdp_i2c.h sdp_i2c.c sensirion_i2c_hal.h sensirion_i2c.h sensirion_i2c.c \
sensirion_i2c_hal.c sensirion_config.h sensirion_common.h sensirion_common.c sdp_i2c_example_usage.c
```
- Test your connected sensor
- Run `./sdp_i2c_example_usage` in the same directory you used to
compile the driver.
Output:
```
Product number: 0x03020b01
Serial Number: 1902067650
Differential pressure: -0.17 Pa
Temperature: 28.80 °C
Differential pressure: -0.03 Pa
Temperature: 28.80 °C
Differential pressure: -0.03 Pa
Temperature: 28.80 °C
Differential pressure: -0.03 Pa
...
```
## Troubleshooting
### Building driver failed
If the execution of `make` in the compilation step 3 fails with something like
> -bash: 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
```
Error executing sdp_get_serial_number(): -1
Error executing sdp_read_product_identifier(): -1
Error executing sdp_start_continuous_measurement_with_diff_pressure_t_comp_and_averaging(): -1
Error executing sdp_read_measurement(): -1
```
then go through the below troubleshooting steps.
- Ensure that you connected the sensor correctly: All cables are fully
plugged in and connected to the correct pin.
- Ensure that I2C is enabled on the Raspberry Pi. For this redo the steps on
"Enable the I2C interface in the raspi-config" in the guide above.
- Ensure that your user account has read and write access to the I2C device.
If it only works with user root (`sudo ./sdp_i2c_example_usage`), it's
typically due to wrong permission settings. See the next chapter how to solve this.
### 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
```