Board description

UM1502

8/23

Doc ID 022625 Rev 1

PWM modulation, in order to simulate the functionality of an electromechanical

pressure sensor. 43 Hz means 0 mbar, while at 38 Hz the pressure is 30 mbar.

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Zero offset

The zero offset is a way to set a pressure (and temperature) reference before filling the

container with the liquid. In the demonstration board, this operation is performed by

pressing a button. Once the button is pressed, the pressure measured at that moment

is considered as 0 mbar. In a real application, there is no such a button to press; the

zero reference is set by the main MCU through a dedicated software routine.

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STM8S103F2

The entire process is controlled by a 20-pin, 8-bit STM8S103F2 microcontroller. The

code size of the firmware is below 2 Kilobytes.

2.2

Schematic diagram

Figure 3.

STEVAL-MKI111V1 circuit schematic - part 1