The microcontroller used on the Preon32 radio module has a large number of interfaces. These can be used to control both sensors and actuators with different protocols. VIRTENIO offers a VariSen sensor module for the Preon32 Shuttle, which has been developed to fit the radio module and contains a large number of sensors for different measured variables.
In this example for the PreonVM, a digital relative humidity sensor (SHT21) is operated on one of the I2C interfaces. The driver enables a continuous recording of the air humidity. During the course of the program, measured values are recorded at a time interval of 1000ms and output as pure sensor values as well as values converted into relative humidity.