Datasheet

Communication Protocol

The Altimeter Module has built in two types of serial interfaces: SPI and I

C. Pulling the Protocol Select

pin PS low selects the SPI protocol. The module pulls the PS high making the default communication

protocol I

C. For details on use of these communication protocols, please refer to the datasheet located

on the 29124 product page.

Example Code

Example code is available for download from the 29124 product page at www.parallax.com.

C Code

Please see application note “APPNote_520_C_code.pdf” on the 29124 product page for C code examples

using Measurement Specialties Altimeters.

Propeller

™

P8X32A

The Altimeter_Demo_and_Driver.zip contains 29124_simple_altimeter_demo.spin file which is a simple

demonstration showing altitude with a configurable starting altitude. Also contained in the zip file is an

HTML file “29124_altimeter.html” that goes over in detail about the altimeter driver used in the demo

code.

The Demo programs use Parallax Serial Terminal to display the device output. The object and the

Parallax Serial Terminal itself are included with the with the Propeller Tool v1.2.7 or higher, which is

available from the Downloads link at www.parallax.com/Propeller.