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KA-Nucleo-Weather

Description

KA-Nucleo-Weather is an functional expander for NUCLEO and Arduino boards with set of environmental sensors: pressure, humidity, temperature and light intensity sensors as well as 5-way joystick and RGB LED.

KA-Nucleo-Weather modul.png
Basic features and parameters
  • Compatibility with NUCLEO and Arduino systems
  • Embedded MEMS pressure sensor (LPS331):
    • Measurement range 260 to 1260mbar
    • Measurement output data rate (ODR) 1 Hz to 25 Hz
    • ADC resolution 16 bits
    • Interface: SPI/I2C (used I2C)
  • Embedded MEMS humidity sensor (HTS221):
    • Measurement range 0 to 100% (relative humidity)
    • Measurement output data rate (ODR) 1 Hz to 12,5 Hz
    • ADC resolution 16 bits
    • Interface: SPI/I2C (used I2C)
  • Embedded digital temperature sensor (STLM75):
    • Measurement range –55°C to +125°C
    • ADC conversion time <150ms
    • Integrated programmable thermostat
    • ADC resolution 9 bits
    • Interface: SMbus/I2C
  • Embedded digital light intensity sensor ALS (TSL25721):
    • Approximates human eye response
    • Integrated analog amplifiers with programmable gain
    • Two measurement canals
    • Integrated programmable comparators
    • Measurement dynamic range 45,000,000:1
    • Maximum light intensity to 60000 lux
    • ADC resolution 16 bits
  • Embedded RGB LED
  • Embedded 5-way joystick
  • Extended pins connector


Standard equipment
Code Description
KA-Nucleo-Weather
  • Assembled and launched module
Electrical schematics
KA-Nucleo-Weather schemat.png
Board view


KA-Nucleo-Weather obrys PCB.png
Temperature sensor

In expander was used semiconductor temperature sensor STLM75 with digital output. Communication interface of temperature sensor is connected to common (for all sensors) I2C bus. Communication lines of I2C interface are pulled up to power supply by 4,7 kΩ resistors. Connection method of temperature sensor to microcontroller is showing on schematic. Output of temperature sensor is connected to line A2, which is input canal of ADC_IN4 (PA4 GPIO pin of STM32).

KA-Nucleo-Weather obrys schemat temp sens.png


Line STLM75 Line name GPIO in STM32 STM32 interface Comments
SCL D15 PB8 I2C1 Lines was pulled up to power supply lines by 4,7 kΩ resistors
SDA D14 PA9
OS/INT D7 PA8 -


Jumper JP1 make possible choosing base address of STLM75 chip according to table below:

Closed pins JP1 A0 I2C base address
1-2 1 90h/91h
2-3 0 92h/93h
Light intensity sensor (ALS)

Expander is equipped with digital sensor of light intensity in environment TSL25721. Sensor has I2C interface. Communication bus of this sensor is connected to common (for all sensors) I2C bus. I2C communication lines are pulled up to power supply by 4,7 kΩ resistors. Connection method of TSL25721 sensor to microcontroller is showing on schematic.

KA-Nucleo-Weather obrys schemat ALS sens.png


Line TSL25721 Line name GPIO in STM32 STM32 interface Comments
SCL D15 PB8 I2C1 Lines was pulled up to power supply lines by 4,7 kΩ resistors
SDA D14 PA9
INT A0 PA0 - -


TSL25721 sensor is placed in I2C bus under base address 72h/73h.

Humidity sensor

Expander is equipped with digital humidity sensor HTS221 with I2C communication interface. Communication bus of this sensor is connected to common (for all sensors) I2C bus. I2C communication lines are pulled up to power supply by 4,7 kΩ resistors. Connection method of HTS221 sensor to microcontroller is showing on schematic.

KA-Nucleo-Weather obrys schemat humi sens.png


Line HTS221 Line name GPIO in STM32 STM32 interface Comments
SCL D15 PB8 I2C1 Lines was pulled up to power supply lines by 4,7 kΩ resistors
SDA D14 PA9
DRDY D8 PA9 - -


HTS221 sensor is placed in I2C bus under base address BEh/BFh.

Pressure sensor

Expander is equipped with digital pressure sensor LPS331 with I2C communication interface. Communication bus of this sensor is connected to common (for all sensors) I2C bus. I2C communication lines are pulled up to power supply by 4,7 kΩ resistors. Interrupt output (INT1 and INT2) of sensor LPS331 can work in push-pull mode and don't need pulling up to power supply. Connection method of LPS331 sensor to microcontroller is showing on schematic.

KA-Nucleo-Weather schemat press sens.png


Line LPS331 Line name GPIO in STM32 STM32 interface Comments
SCL D15 PB8 I2C1 Lines was pulled up to power supply lines by 4,7 kΩ resistors
SDA D14 PA9
INT1 A1 PA1 - Outputs should be configured as push-pull
INT2 A2 PA4 -


LPS331 sensor is placed in I2C bus under base address BAh/BBh.

LED-RGB

On-board LED-RGB are controlled direct with GPIO pins of microcontroller (according to table below). Diodes are on, if state of control line has logical state „0”.

LED Line name GPIO in STM32 Comments
Red D12 PA6 LEDs are on, if state on GPIO pins is „0”
Green D11 PA7
Blue A3 PB0
KA-Nucleo-Weather obrys schemat LED RGB.png
Joystick

Embedded 5-way tact switch is connected direct to GPIO pins of microcontroller (according to table below). Each of pins are pulled up to power supply by using 10 kΩ resistor.

Joystick direction Line name GPIO in STM32 Comments
Up D4 PB5 Lines pulled up to power supply by 10 kΩ resistor.
Down D10 PB6
Left D3 PB3
Right D5 PB4
OK D6 PB10
KA-Nucleo-Weather obrys schemat joy.png
Signal connections map of GPIO pins
KA-Nucleo-Weather broszura.png