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https://github.com/sensirion/raspberry-pi-i2c-sen44
RaspberryPi driver for Sensirion SEN44 sensor module
https://github.com/sensirion/raspberry-pi-i2c-sen44
driver i2c raspberry-pi sen44 sensirion
Last synced: about 2 months ago
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RaspberryPi driver for Sensirion SEN44 sensor module
- Host: GitHub
- URL: https://github.com/sensirion/raspberry-pi-i2c-sen44
- Owner: Sensirion
- License: bsd-3-clause
- Created: 2021-03-04T19:53:12.000Z (almost 4 years ago)
- Default Branch: master
- Last Pushed: 2024-05-13T13:02:55.000Z (8 months ago)
- Last Synced: 2024-05-14T14:13:56.397Z (8 months ago)
- Topics: driver, i2c, raspberry-pi, sen44, sensirion
- Language: C
- Homepage:
- Size: 876 KB
- Stars: 0
- Watchers: 5
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# Sensirion Raspberry Pi I2C SEN44 Driver
This document explains how to set up the SEN44 sensor module to run on a Raspberry Pi using the provided code.
## Setup Guide
### Connecting the Sensor
Your sensor has the five different connectors: VCC, GND, SDA, SCL, SEL (the sixth connector will not be used for now).
Use the following pins to connect your SEN44:
*SEN44* | *Raspberry Pi* | *Jumper Wire* |
:------: | :-------------------------: | :---------------: |
VCC | Pin 2 (5V) | Red |
GND | Pin 6 | Black |
SDA | Pin 3 | Green |
SCL | Pin 5 | Yellow |
SEL | Pin 9 (GND for I2C) | Blue |
| *Pin* | *Name* | *Description* | *Comments* |
|-------|--------|---------------|------------|
| 1 | VDD | Supply Voltage | 5V ±10%
| 2 | GND | Ground |
| 3 | RX | UART: Receiving pin for communication | TTL 5V and LVTTL 3.3V compatible
| | SDA | I2C: Serial data input / output | TTL 5V and LVTTL 3.3V compatible
| 4 | TX | UART: Transmission pin for communication | TTL 5V and LVTTL 3.3V compatible
| | SCL | I2C: Serial clock input | TTL 5V and LVTTL 3.3V compatible
| 5 | SEL | Interface select | Leave floating or pull to VDD to select UART
| | | | Pull to GND to select I2C
| 6 | NC | Do not connect |
### 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-sen44) 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-sen44`
3. Run the `make` command to compile the driver
Output:
```
rm -f sen44_i2c_example_usage
cc -Os -Wall -fstrict-aliasing -Wstrict-aliasing=1 -Wsign-conversion -fPIC -I. -o sen44_i2c_example_usage sen44_i2c.h sen44_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 sen44_i2c_example_usage.c
```
- Test your connected sensor
- Run `./sen44_i2c_example_usage` in the same directory you used to compile the driver.
Output:
```
Serial number: C081C2651224B6FE
Firmware: 0.4, Hardware: 6.0
Mass concentration pm1p0: 1 µg/m³
Mass concentration pm2p5: 5 µg/m³
Mass concentration pm4p0: 9 µg/m³
Mass concentration pm10p0: 11 µg/m³
Voc index: 0.0
Ambient humidity: 36.77 %RH
Ambient temperature: 26.20 °C
Mass concentration pm1p0: 4 µg/m³
Mass concentration pm2p5: 6 µg/m³
Mass concentration pm4p0: 7 µg/m³
Mass concentration pm10p0: 8 µg/m³
Voc index: 0.0
Ambient humidity: 36.77 %RH
Ambient temperature: 26.20 °C
...
```
## Troubleshooting
### Initialization failed
- 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 ./sen44_i2c_example_usage`), it's typically due to wrong permission settings.