Experiment 7

How to Transmit Data on a Logic-Level Change

Requirements

2 XBee modules

2 XBee adapters

1 3.3-volt DC power supply

1 10-kohm (10,000-ohm) variable resistor

1 Solderless breadboard

1 USB-to-XBee adapter

1 USB cable—type-A to mini-B

X-CTU software running on a Windows PC, with an open USB port

Small screwdriver, flat blade

Copies of the tables from Appendix I

Introduction

In Experiment 6, an XBee module transmitted data continuously based on the Sample-Rate and the Samples-before-TX parameters set with the X-CTU program. If an equipment designer selected a long sample rate—a long period between samples—the equipment could miss detecting a change at one of the XBee module’s digital inputs when it occurs. Suppose you have connected ...

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