Analog sensor

Configuration

When using a Configuration object, the configuration file must contain at least the following parameters,

{ // Root node //
    "sensors": { // Section //
        "<sensor name>::text": { // Tree node //
            "name": "<sensor name>::text", // Leaf node //
            "topic": "<topic>::text",
            "sampling_rate": <sampling_rate>::real,
            "zero": <zero>::real,
            "span": <span>::real,
            "quantization_bits": <quantization_bits>::unsigned integer,
            "zero_voltage": <zero_voltage>::integer,
            "span_voltage": <span_voltage>::integer
        }
    }
}

The explanation of the meaning of each parameter follows,

• name: A text identifier for the sensor. Must be unique.
• topic: The topic where the sensor will publish its data to.
• sampling rate: The rate in nanoseconds at which the framework will sample the sensor.
• zero: The voltage at which the ADC reads the lowest value
• span: The voltage at which the ADC reads the highest value
• scale: The maximum value that can be read by the sensor
• quntization bits: The resolution of the ADC in bits
• zero voltage: The lowest possible voltage at which the ADC reads a value (tipically 0)
• span voltage: The maximum possible voltage at which the ADC reads a value (tipically 5 or 3.3)