SRF02 to BrainStem Example

Related
Products

Brainstem GP 1.0 Module

2600mAh AA NiMH Battery

Devantech SRF02 Sensor

BrainStem IIC Cable

4X AA Battery Pack w/Connector

Contents

Introduction
Circuit Schematic
Source Code - I2C Mode

Hardware used for SRF02 to a BrainStem GP controller.

Introduction

In this example, a BrainStem GP 1.0 module uses a Devantech SRF02 Ranger to measures distances to obstacles. The BrainStem GP 1.0 uses its built in high speed IIC bus to communicate with the ranger and display the readings on the Console application.

Contents

Circuit Schematic

In the following schematic, one of the IIC headers on the BrainStem is used to interface to the IIC port on the SRF02 ranger. Power and ground are also connected using the BrainStem GP's built-in power regulation. Additionally, this circuit uses the 4 AA battery pack to power the circuit.

Wiring diagram for interfacing the SRF02 to the IIC bus on the BrainStem.

Contents

Source Code - I2C Mode

The software interface for the SRF02 is identical that of the SRF08 and SRF10 Ultrasonic rangers. This program utilizes the built-in library for handling Devantech SRF08 Rangers and specifies which IIC address is used for the ranger. Different constants could be used to specify the readings in centimeters or milliseconds. Additional SRF02's could be added along the IIC bus and given different addresses. These other addresses would then be sent as parameters to the aSRF08_RangeInt command.

/* file: srf02ex.tea */ #include <aSRF08.tea> #include <aPrint.tea> #include <aCore.tea> #define SRF02_ADDR 0xE0 void main() { int val; while(1) { /* take inch reading from address 0xE0 */ val = aSRF08_RangeInt((char)SRF02_ADDR, aSRF08_INCH); /* display on console */ aPrint_IntDec(val); aPrint_String(" inches\\n"); /* sleep for 1 second */ aCore_Sleep(10000); } /* while */ } /* main */

Revision History:

2006-11-30: Example Created