LaskaKit Outdoor Meteo THP Sensor SHT40 + BMP280

Product detailed description

The outdoor weather sensor from LaskaKit combines precise temperature, humidity and pressure sensors – SHT40 and BMP280 with conformal coating from the factory and is therefore much more resistant to humid environments. It is ideal for outdoor weather measurement, weather stations or environmental monitoring. We designed this sensor because bme metal sensors do not measure humidity correctly after several months of operation outside.

Choosing a good, high-quality and affordable sensor for measuring temperature, humidity and pressure is not easy. It is with these requirements in mind that this module was created - a practical solution that combines high precision, ease of use and low power consumption.

The board features a modern SHT40 from the Swiss company Sensirion, enclosed in a compact DFN4housing. This sensor excels in temperature and relative humidity accuracy, low noise and reliability even in harsh environments. There is also a BMP280 - a proven Bosch sensor for accurate barometric pressure measurement and also additional temperature measurement. The module thus covers all basic meteorological variables.

The module also includes pull-up resistors for the I2C bus and a blocking capacitor to ensure a stable power supply. The unit is housed in a practical outdoor housing with filter, suitable for mounting in weather stations or other outdoor applications.

Thanks to a specially designed plate, the sensor part can be broken off and used for installation in the sensor housing or any other suitable housing. After breaking, there are no more pullup resistors on the ^I2Cboard and it is necessary that the device to which the sensor will be connected has them.

Refresh SHT4x sensors:

• We recommend that you refresh the sensor before the first start-up to remove any contamination and ensure that the sensor measures within the specified parameters. Refresh consists in starting the internal heating of the sensor to a temperature of approx. 120°C for approx. 90 min until the measured humidity value drops to approx. 5% RH. It is better to do this procedure in a room with a humidity of about 50%RH and a temperature of about 23°C. Depending on the temperature and humidity in the room, the treatment time may vary. For this purpose, we have created a program for Arduino, which incorporates the switching of the internal heating and the simultaneous measurement of the current humidity value. When the measured humidity drops to 5%RH, the cycle stops and switches to the standard measurement. The real values are then available after the sensor has cooled down to ambient temperature.
• This procedure can be used even if the sensor stops measuring the correct values over time.

Key features

• Temperature measurement using SHT40
• Relative humidityusing SHT40
• Atmospheric pressure with BMP280 sensor
• Communication via I2C bus
• Ready to install - Sensor can be broken off and used for installation in the sensor housing
• Easy connection via µŠup four-pin connector (STEMMA QT, Qwiic)
• Low power consumption - ideal for battery-powered devices

Specifications:

• Power: 1.8-3.6V DC - typically 3.3V DC
• Resolution: 16bit
• SHT40:
  • Operating range:
    • Temperature: -40-125°C
    • Humidity: 0-100% RH
  • Distinction:
    • Temperature: 0.01°C
    • Humidity: 0.01 RH
  • Accuracy:
    
    • Temperature: ±0.2°C
    • Humidity: ±1.8% RH
• BMP280:
  
  • Operating range:
    • Pressure: 300-1100hPa
    • Temperature: -40 to +85°C
  • Distinction:
    • Temperature: 0.01°C
    • Pressure: 0.16Pa
  • Accuracy:
    • Temperature: ± 0.5°C
    • Pressure: ± 1.7hPa
• Dimensions: 26x19mm

Included in delivery:

• 1pc LaskaKit Outdoor Meteo THP Sensor SHT40 + BMP280
• 1pc pin bar

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustration purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.
• Outdoor case not included