Install the SVM4x Driver

The driver installation consists of creating a Python virtual environment, activating it, and installing the driver using pip.

Create a Python virtual environment:

python -m venv .venv

Activate the virtual environment:

source .venv/bin/activate

.venv\Scripts\Activate.ps1

.venv\Scripts\activate.bat

Install the driver:

python -m pip install sensirion_i2c_svm41

Use the SensorBridge on Windows

Install the driver for the Sensirion SEK-SensorBridge:
```
python -m pip install sensirion-shdlc-sensorbridge
```
Connect the SEK-SensorBridge to your PC over USB.

If the SEK-SensorBridge is not detected by your system, follow the SensorBridge FTDI Driver Installation.
Connect the SVM4x sensor to the SEK-SensorBridge.
Run an example script in the activated virtual environment.

By default, the script assumes that the SensorBridge is connected to the COM1 serial port. If a different port is used, specify it with the --serial-port parameter:
```
python examples/example_usage_sensorbridge_svm4x.py --serial-port <your COM port>
```

Example script

import time
from sensirion_shdlc_driver import ShdlcSerialPort, ShdlcConnection
from sensirion_shdlc_sensorbridge import SensorBridgePort, \
    SensorBridgeShdlcDevice, SensorBridgeI2cProxy
from sensirion_i2c_driver import I2cConnection
from sensirion_i2c_svm41 import Svm41I2cDevice

# Connect to the SensorBridge with default settings:
#  - baudrate:      460800
#  - slave address: 0
with ShdlcSerialPort(port='COM1', baudrate=460800) as port:
    bridge = SensorBridgeShdlcDevice(ShdlcConnection(port), slave_address=0)
    print("SensorBridge SN: {}".format(bridge.get_serial_number()))

    # Configure SensorBridge port 1 for SVM41
    bridge.set_i2c_frequency(SensorBridgePort.ONE, frequency=100e3)
    bridge.set_supply_voltage(SensorBridgePort.ONE, voltage=3.3)
    bridge.switch_supply_on(SensorBridgePort.ONE)

    # Create SVM41 device
    i2c_transceiver = SensorBridgeI2cProxy(bridge, port=SensorBridgePort.ONE)
    device = Svm41I2cDevice(I2cConnection(i2c_transceiver))

    # Print some device information
    print("Version: {}".format(device.get_version()))
    print("Serial Number: {}".format(device.get_serial_number()))

    # Start measurement
    device.start_measurement()
    print("Measurement started... ")
    while True:
        time.sleep(10.)
        humidity, temperature, air_quality_voc, air_quality_nox = \
            device.read_measured_values()

        # use default formatting for printing output:
        print("{}, {}, {}, {}".format(humidity,
                                      temperature,
                                      air_quality_voc,
                                      air_quality_nox))

Use the Linux I²C Driver

On Linux systems, the sensor can alternatively be accessed directly through the Linux user-space I²C driver.

Connect the SVM4x sensor to an I²C port of your system, for example I²C port 1 of a Raspberry Pi.
Run an example script in the activated virtual environment.

By default, the script assumes that the sensor is connected to /dev/i2c-1. If a different port is used, specify it with the --i2c-port parameter:

Example script

import time
from sensirion_i2c_driver import I2cConnection, LinuxI2cTransceiver
from sensirion_i2c_svm41 import Svm41I2cDevice


with LinuxI2cTransceiver('/dev/i2c-1') as i2c_transceiver:
    device = Svm41I2cDevice(I2cConnection(i2c_transceiver))
    device.device_reset()

    # Print some device information
    print("Version: {}".format(device.get_version()))
    print("Serial Number: {}".format(device.get_serial_number()))

    # Start measurement
    device.start_measurement()
    print("Measurement started... ")
    while True:
        time.sleep(10.)
        humidity, temperature, air_quality_voc, air_quality_nox = \
            device.read_measured_values()

        # use default formatting for printing output:
        print("{}, {}, {}, {}".format(humidity,
                                      temperature,
                                      air_quality_voc,
                                      air_quality_nox))