Humidity Measurement Application; Figure 71. Brightness Level; Figure 72. Humidity Calibration 1 - ST STM32303C-EVAL User Manual

UM1590

Figure 71. Brightness level

2.4.9

Humidity measurement application

Before humidity measurements can be performed, a 2-step calibration is required:
1. In the first step, the capacitance offset error is evaluated and saved in backup
registers, this phase is performed with JP19 installed in 2-3 (REF) position.
The message shown in
The user must press SEL and follow the next step.

Figure 72. Humidity calibration 1

2. In the second step, the humidity measurement accurancy can be improved by
entering the actual humidity reference at calibration time if it is known. After seeting the
JP19 to HUM position, select a reference humidity value using UP/DOWN buttons as
indicated on
humidity value unchanged and press the SEL button.
Figure 72 is displayed.
Figure 73 then press the SEL button. Otherwise, let the estimated
Doc ID 023892 Rev 1
Running the demonstration
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