Add support for DFRobot DFR0300 EC sensor (using DFRobot DFR0566 Raspberry PI expansion HAT) #425
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This adds support for the DFR0300 EC sensor
The sensor needs an ADC, so this PR also adds support for the DFRobot DFR0566 Raspberry PI expansion HAT, which is then available to any other sensors that require it, and provides pin sockets for DFRobot Analog, Digital, I2C, PWM preipherals.
As the DFR0566 is effectively a driver, it has been added to a separate
driversdirectory in thesensorsdirectory so it can be used by other sensors, and other driver code could be added as needed.For optimal accuracy, the DFR0300 needs to read the current temperature from another sensor, so this PR also adds the
event_busargument tosetup_sensor, so that in future, all sensors will be able to query the event bus for any events they may need to subscribe to.This has required changing the code for all other sensors that call
setup_sensor.