User Manual

Quick-Start Guide

The following is a very basic procedure to get started initializing and reading values from the Gyroscope

Module. Example test code for the Propeller and Basic Stamp can be found on the 27911 product page at

www.parallax.com.

This module’s default communication setup is I²C. Use of SPI communication is configured by pulling the

CS line low. See the datasheet for 3-wire and 4-wire SPI configuration and use.

1. With main power off, make the proper connections between the module and a microcontroller as

shown below. The voltage connected to the VIN pin should be the same as the voltage powering

the microcontroller communicating with the device.

2. Power on the device and load the BASIC Stamp or Propeller sample code provided on the 27911

product page.

NOTE: The SDA pin is connected to a bi-directional level shifting IC, used to translate the lower

I/O voltage of the L3G4200D to the possibly higher voltage used by an externally connected

device. This particular level shifter has built-in pull-up resistors to each supply rail so it can be

driven by open drain outputs for I

C; but can also be driven low/high for SPI protocol. The CLK

and CS pins operate exclusively as inputs, so a simpler level shifting circuit with a resistor and

Schottky diode is used. For the SDO pin another simple level shifting circuit is used along with a

MOSFET and two resistors.

In summary, there is no need for any external hardware to operate.

Calibration

Each L3G4200D is factory tested and trimmed for zero-rate level and sensitivity. So, for most common

applications, no further calibration is required. For details on the calibration, please reference page 31 of

Gyro_app_Note1.pdf on the product page.