User Manual
PoKeys user manual
58
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a) Using gain and offset: specify the gain and offset characteristics of the sensor. The gain
specifies the number of sensor units per 1 V of analog voltage, while the offset specifies the
sensor value of analog voltage input of zero.
Figure 34: Analog sensor setup with gain / offset option
b) Using two point mapping: in this mode, two sensor values with corresponding analog voltage
must be entered into the fields provided. Gain and offset of the sensor are automatically
calculated.
Figure 35: Analog sensor setup with mapping
Analog sensors use the following formula to convert the analog input voltage into sensor reading
where is a measurement of the analog-to-digital converter (a value between 0 and 4095),
is gain (32-bit integer number) and
is result offset (32-bit integer number). The value of
is a integer number that gets divised by 100 for the display (the temperature of 15.58 °C is
represented by . A gain of 330 therefore gives the true voltage on the analog input pin. The
analog sensor dialog shows the gain and offset settings in the bottom left corner of the dialog and
should not be confused with Gain and Offset setup parameters.