1

Application overview

Predictive maintenance applications collect and process data from a wide variety of sensors in order to identify

potential failures in machinery before they happen. A principal requirement of such applications is that the

condition monitoring equipment is placed very close to relevant machine componentry for the data to be reliable,

which is why the STWIN node is designed to be small but robust, self-powered and capable of wireless

communication.

Another application issue is the high volumes of preferably real-time data processing involved, which can

overwhelm centralized monitoring and control systems, and corresponding communication networks. Distributed

(or decentralized) computing architectures represent a valid solution to this problem by performing data pre-

processing and analytical operations directly on the node. The STWIN kit supports and can demonstrate this

concept through sample applications in the firmware package running on the STM32L4+ ultra-low-power

microcontroller embedded on the core system board.

SPI3

ADC1

USART2

Enanced

SWD

Connector

UART5

I2C2

ADC3

GPIO

Auxiliary

Connector

DFSDM1

I2C2

IMP34DT05

Digital Microphone

LPS22HH

Pressure Sensor

HTS221

Humidity and

Temperature Sensor

STTS751

Temperature Sensor

IIS2MDC

3D Magnetometer

STM32L4R9ZIJ6

Microcontroller

Ultra Low Power

Cortex M4F@120MHz

32 kHz

Crystal

16 MHz

Crystal

SPBTLE-1S

BLE Application

Processor Module

STR485LV

RS485 Interface

SPI2

MP23ABS1

Analog Microphone

TS922EIJT

Low noise, low

distortion OpAmp

20-pin STMOD+

12-pin female sensor

connector

12-pin male

connector

40-pin Flex

STSAFE

Secure Element*

I2C2

SPIx, I2S,

USARTx,...

IIS2DH

3D Accelerometer

IIS3DWB

Vibrometer

ISM330DHCX

6-Axis IMU

USBLC6-2P6

USB ESD protection

ESDALC6V1-1U2

Single Line ESD

protection

EMIF06-MSD02N16

EMI filter and ESD

protection

STBC02

Li-Ion linerar battery

charger

ST1PS01EJR

step-down switching

regulator

LDK130

Low Noise LDO

Sensing

Processing

Connectivity

Power Mng.

Analog

Secure

* not mounted

connector

connector

Finally, the actual sensing equipment can be subject to a very wide range of low frequency (imbalance or

misalignment), medium frequency (worn gears or bearings) and high frequency (worn cooling fan bearings)

vibrations, which is why our node carries several high performance accelerometers, IMUs and magnetometers,

capable of detecting movement along 9 axes to a very high degree of sensitivity. For very high frequencies in the

order of tens of kilohertz, vibration analysis is covered by sound and ultrasound applications based on data

coming from a digital microphone and a high performance analog microphone, respectively.

RELATED LINKS

Visit the ST Condition Monitoring / Predictive Maintenance application page for more information on relevant ST applications

and solutions

STEVAL-STWINKT1

Application overview

DB3969 - Rev 4

page 3/11