Experiences made with the internal sensors of the PCD7.D290 display

FAQ #101360

 

Reason
Due to the fact that the sensors are mounted directly in the display which itselfs influences the measurement it has been stated that the precisision is not according to the manual of this PCD7.D290 display (26/841 version 4). The chapters 4.2.3 (Temperature sensor) and 4.2.4 (R.H. sensor) will be adapted accordingly in the next release.


4.2.3 Temperature sensor

Temperature sensor used in PCD7.D290 is active and supplies as output a voltage of 10.0 mV/°C; this sensor is directly calibrated in °C.
Embedded temperature sensor component is directly soldered on the main board of the PCD7.D290
Theoretical accuracy value: ± 0.5°C at 25 °C., Practical accuracy value: ± 1°C (± 1.5°C in the worse case)

4.2.4 R.H. sensor

R.H. sensor used in PCD7.D290 is capacitive and supploes as output a capacity in the range 161.6 pF at 0% R.H. and 193.1 pF at 100% R.H.
The evaluation algorithm is stored directly inside D290 firmware.
Embedded humidity sensor component is directly soldered on the main board of the PCD7.D290 --> Practical accuracy value: ± 5%