ZigBee Based Wireless Motor Control - part 1

ABSTRACT

Wireless sensor networks have been very popular research field for the last couple of years. ZigBee is a new technology now being deployed for wireless sensor networks. ZigBee is a low data rate wireless network standard defined by the ZigBee Alliance and based on the IEEE 802.15.4.The ZigBee wireless network has some advantages compared  with other wireless networks, it has the characteristics of low power, low price, highly secured and reliable, so implementing a remote motor control and monitoring system proves to have a good cost performance ratio.

This paper presents the implementation of a wireless sensor actor network (point to point) to control the speed of a DC motor from a remote location. Pulse Width Modulation technique provides the actual control. A feedback to measure the current speed is setup using Infra Red Sensor and fed to PIC16F877 Microcontroller directly. The conventional setup uses a frequency to voltage converter to find the speed whereas a new technique is used to calculate the speed from the IR sensor output without using frequency to voltage converter. The motor is controlled remotely with a ±5 rpm tolerance.

Keywords: Wireless Sensor Networks, ZigBee, Xbee, motor control  

INTRODUCTION

ZigBee is a new technology now being deployed for wireless sensor networks. A sensor network is an infrastructure comprised of sensing, computing and communications elements that allows the administrator to instrument, observe and react to events and phenomena in a specified environment. In this paper point to point communication is established with ZigBee connectivity for DC motor speed control

ZIGBEE

ZigBee is one of the wireless protocols based on the IEEE 802.15.4 standard for wireless personal area networks (WPANs). ZigBee is designed to use in embedded applications requiring low data rates and low power consumption. ZigBee’s key features are as follows: (a) Reliable and self configuration (b) Supports large number of nodes (c) Easy to deploy (d) Very long battery life (e) Secure (f) Low cost (g) Can be used globally

ZIGBEE RADIO

Many companies like Texas, Microchip, Atmel, and Ember are producing ZigBee radios. In this paper the Xbee, a ZigBee radio from MaxStream Inc[6]. is chosen. One of the main advantages of the XBee module is its easy UART (Universal Asynchronous Receive Transmit) serial interface. This interface makes it ideal for communication with a PC, as well as a microcontroller. Devices having a UART interface can be connect directly to this Xbee module.It runs off a voltage of between 2.8 and3.4 V, the consumption being 45 mA in TX, 50 mA in RX and less than 10uA in power-down, the whole set being supplied with 3.3 V.

EXPERIMENTAL SETUP

               NODE UNIT BLOCK DIAGRAM:

HOST UNIT BLOCK DIAGRAM

IR SENSOR UNIT:

FLOWCHART:       

This flowchart shows the operation of host unit:

The below flowchart shows operation of node unit:

Post by
SANTHOSH BHARADWAJ REDDY ( my R&D Proj )