The Parallax 29124 is a high resolution (20 cm) altimeter sensor with SPI and I²C bus interface.

The module includes a high linearity barometric pressure sensor and a high resolution temperature output, allowing implementation of an altimeter/thermometer without any additional sensors. Different operation modes allow the user to optimize for conversion speed or current consumption. The module is designed for use with a large variety of microcontrollers with different voltage requirements.

Features:

• High resolution 20 cm or altitude
• Thermometer of -40 to +85 °C with <.01 °C resolution
• Pressure range of 10–1200 mbar
• Supports I²C and SPI communications
• 24-bit pressure and temperature values

Application Ideas:

• Mobile altimeter / barometer systems
• Rate of climb and descent Indicator (RCDI)
• Height sensing
• Navigation
• Weather station
• Altitude hold for UAVs
• IMU builds

Key Specification:

• Power Requirements: 3.3 to 6.5 VDC
• Communication Interface: I2C (up to 400 kHz) or SPI (20 MHz)
• Operating temperature: -40 to +185 °F (-40 to +85 °C)
• Dimensions: 0.85 X 0.80 in (2.16 X 2.03 cm)

Altimeter Datasheet

Introducing Altimeter 29124

Altimeter App Note 1