66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
# SPDX-FileCopyrightText: 2021 Jose David M
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#
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# SPDX-License-Identifier: Unlicense
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"""
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Example showing the use of Fake_requests to access a Temperature Sensor information
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Database. Inspired on the I2C buddy and a Discussion with Hugo Dahl
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"""
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import board
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from adafruit_fakerequests import Fake_Requests
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# Create the fakerequest request and get the temperature sensor definitions
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# It will look through the database and print the name of the sensor and
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# the temperature
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response = Fake_Requests("fakerequests_i2c_database.txt")
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definitions = response.text.split("\n")
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# We create the i2c object and set a flag to let us know if the sensor is found
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found = False
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i2c = board.I2C()
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# We look for all the sensor address and added to a list
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print("Looking for addresses")
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i2c.unlock() # used here, to avoid problems with the I2C bus
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i2c.try_lock()
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sensor_address = int(i2c.scan()[-1])
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print("Sensor address is:", hex(sensor_address))
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i2c.unlock() # unlock the bus
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# Create an empty list for the sensors found in the database
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sensor_choices = []
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# Compare the sensor found vs the database. this is done because
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# we could have the case that the same address corresponds to
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# two or more temperature sensors
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for sensor in definitions:
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elements = sensor.split(",")
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if int(elements[0]) == sensor_address:
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sensor_choices.append(sensor)
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# This is the main logic to found the sensor and try to
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# initiate it. It would raise some exceptions depending
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# on the situation. As an example this is not perfect
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# and only serves to show the library capabilities
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# and nothing more
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for find_sensor in sensor_choices:
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module = find_sensor.split(",")
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package = module[2]
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class_name = str(module[3]).strip(" ")
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try:
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module = __import__(package)
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variable = getattr(module, class_name)
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try:
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sensor = variable(i2c)
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print(f"The sensor {class_name} gives a temperature of {sensor.temperature} Celsius")
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found = True
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except ValueError:
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pass
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except Exception as e:
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raise ImportError(f"Could not find the module {package} in your lib folder.") from e
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if found:
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print("Congratulations")
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else:
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print("We could not find a valid Temperature Sensor")
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