Quick Start¶
SensorBridge Example¶
Following example code shows how to use this driver with a Sensirion SDP8xx connected to the computer using a Sensirion SEK-SensorBridge. It is assumed, that the sensor is plugged into port 1 of the SensorBridge and COM Port 1 is used on the computer. The driver for the SensorBridge can be installed with
pip install sensirion-shdlc-sensorbridge
Depending on the sensor type you connect set the I2C address accordingly when creating the SdpI2cDevice instance. For more details see comments in the code.
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_sdp import SdpI2cDevice
# 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 SDP
bridge.set_i2c_frequency(SensorBridgePort.ONE, frequency=100e3)
bridge.set_supply_voltage(SensorBridgePort.ONE, voltage=3.3)
bridge.switch_supply_on(SensorBridgePort.ONE)
# Create SDP device
#
# Make sure to use the correct i2c address:
# SDP8xx supports the 0x25 and 0x26 I²C addresses, SDP3x supports the
# 0x21, 0x22 and 0x23 I²C addresses.
# Refer to the dedicated datahseet for more detailed information.
i2c_transceiver = SensorBridgeI2cProxy(bridge, port=SensorBridgePort.ONE)
sdp = SdpI2cDevice(I2cConnection(i2c_transceiver), slave_address=0x25)
sdp.stop_continuous_measurement()
sdp.start_continuous_measurement_with_mass_flow_t_comp()
# Measure
try:
for _ in range(50):
differential_pressure, temperature = sdp.read_measurement()
# use default formatting for printing output:
print("{}, {}".format(differential_pressure, temperature))
# custom printing of attributes:
print("{:0.2f} °C ({} ticks), {:0.2f} Pa ({} ticks)".format(
temperature.degrees_celsius, temperature.ticks,
differential_pressure.pascal, differential_pressure.ticks))
time.sleep(0.2)
finally:
sdp.stop_continuous_measurement()
bridge.switch_supply_off(SensorBridgePort.ONE)