HP303B shield for LOLIN Wemos D1 - Barometric Presured and temperature

Atmospheric pressure and temperature sensor for Wemos D1

This shield uses the HP303 sensor, a barometric pressure sensor with several precision levels. This sensor can be connected to the I2C bus of Wemos D1 (pin D1 for SCL and D2 for SDA) in order to read the pressure and temperature (the sensor needs to know the temperature to correct its measurements. Indeed the pressure measurement element is sensitive to dilatation ... and therefore ambient temperature.

The Wemos uses the Arduino library and Arduino example code to test the use of this shield.

It is possible to split the board to extract the sensor which will then be connected to the board using 4 wires. You can use a wire ribbon like this to place the sensor on the outside of the case.

Content

The shield with the barometric pressure sensor (HP303B) and a male connector section to connect the shield to the Wemos.          Wemos, OLED screen and other elements not included.

Technical details

• I2C Interface (default=0x77 or alternative=0x76)
• Pressure: 300 -1200 hPa.
• Temperature: -40 - 85 °C.
• Pressure sensor precision: ± 0.005 hPa (or ±0.05 m) (high precision mode).
• Relative accuracy: ± 0.06 hPa (or ±0.5 m)
• Absolute accuracy: ± 1 hPa (or ±8 m)
• Temperature accuracy: ± 0.5°C.
• 2mm mounting hole, separable by design
• HP303B datasheet
• Compatible DPS310