STEVAL-MKI111V1 STMicroelectronics, STEVAL-MKI111V1 Datasheet - Page 7

• Manufacturer Part Number: STEVAL-MKI111V1
• Description: Development Boards & Kits - Other Processors LPS001WP Water Level Detection Eval BRD
• Manufacturer: STMicroelectronics

Specifications of STEVAL-MKI111V1

• Product Category: Development Boards & Kits - Other Processors
• Rohs: yes

UM1502
2
2.1
Note:
Board description
Block diagram
The water level detection demonstration board can be divided into a few simple blocks.
Figure 2.
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To work properly, the MEMS sensor must be mounted higher than the container.
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Power supply
The power supply is designed using a low drop positive voltage regulator with fixed
output voltage set at 3.3 V DC. The input voltage is in the range 5-12 V DC. The power
supply is protected against reverse polarity.
MEMS sensor
The demonstration board is physically connected to a container through a rubber tube.
The liquid inside the container goes through the rubber tube, pushing the remaining air
against the MEMS sensor. The higher the amount of liquid inside the container, the
higher the amount of pressure the MEMS sensor reads.
The MEMS sensor is also equipped with a temperature sensor. The measure of
temperature can be used to compensate the pressure drift due to temperature
variations.
User interface
The demonstration board features an LED user interface. It roughly shows the pressure
(and depression) read by the MEMS sensor.
The user interface is completed with a debugging connector. It serves to precisely read
the measurements of pressure and temperature in real-time by means of any standard
ST debugging tool with SWIM interface.
Output signals
The pressure and temperature measurements can be accessed either through an I²C
interface, or by PWM modulation. The signals can be sent to an external MCU through
the I²C interface. Alternatively, the pressure signal is sent out in the form of a 43-38 Hz
STEVAL-MKI111V1 block diagram
Doc ID 022625 Rev 1
Board description
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