Wireless Temperature Monitor System using SLS Wi-Fi Add On Board

Transcription

1 , Ver. 1.0 Objective Introduction Wireless Temperature Monitor System using SLS Wi-Fi Add On Board Application Note: AN523 Implement wireless temperature sensor data monitoring system using SLS Wi-Fi Add On Board on SLS CoreCommander board. Implementing applications with wireless networking is becoming common place in embedded applications. From consumer devices to industrial applications, there is a growing expectation that our devices will have built-in ability to talk to each other without a hard-wired connection. The challenge is to select the right wireless networking protocol and implement it in a cost-effective manner. Customers are looking for bringing Wi-Fi connectivity to their embedded applications like small appliances, building control, handheld devices and portable health care and wellness products. SLS has developed an Add On Board using Microchip ZG2100 Wi-Fi solution. The ZG2100 class of Wi-Fi modules allow almost any application to leverage the massive and rapidly growing Wi-Fi infrastructure. Figure 1. below shows the SLS Wi-Fi Add On Board. Figure 1. SLS Wi-Fi Add On Board SLS understands the needs of embedded system designers and has made the ZG2100 Wi-Fi Add On Board for easy adoption in embedded systems. The highly integrated, low-power ZG2100 class is designed from the ground up to enable simple and low-cost connectivity, regardless of host processor. The result is faster time to market and a significant reduction in bill of materials. 1

2 ZG2100 Wi-Fi Solutions You will learn here following: About ZG2100 Wi-Fi Solutions Implementing wireless temperature monitor system ZG2100 Wi-Fi Solutions The ZG2100M & ZG2101M modules are Wi-Fi certified low-power b implementations. All RF components, the baseband and the entirety of the MAC reside on module, creating a simple and cost-effective means to add Wi-Fi connectivity for embedded devices. The module(s) implement a high-level API, simplifying design implementation and allowing the ZG2100M or ZG2101M to be integrated with 8- and 16-bit host microcontrollers. Hardware accelerators support the latest Wi-Fi security standards. There is a fully integrated radio ideal for 1 & 2Mbps operation with optional support for external PA and antenna switch operation. Interface is via SPI slave interface with interrupt for HOST operation. The modules support RS232 serial interfaces (requires level shifter) for debug and JTAG boundary scan. Operation is via a single 3V supply utilizing internal 1.8V regulator, supporting various power states, such as hibernate and SLEEP, for end applications long battery life. ZG2100M contains a built in PCB antenna for ease of system integration and significant BOM reduction. The advantages of using ZG2100/ZG2101 modules are: Low Design efforts Easy-Fi software suite contains APIs to support infrastructure and ad-hoc modes Driver includes a comprehensive suite of commands that allow it to easily run in small or no OS systems Low power consumption Battery operating range V Chip automatically goes on standby in between receiving and transmitting network packets No-host polling allows the microcontroller to shut down while ZG2100 remains active Low system requirement Optimized for low-resource host processors and systems On-chip MAC and WEP/WPA/WPA2 hardware accelerators reduce memory footprint and eliminate host processor cycles Host RAM requirement is as little as 2.8kB Driver memory footprint uses as little as 367bytes of RAM from a host microcontroller, and less than 10kB of ROM 2

3 Application Note Low system cost Easily integrated with a wide-range of microcontrollers: low-cost 8- bit or 16/32-bit microcontrollers No additional memory required to integrate Wi-Fi Certified for regulatory and industry compliance with on-board and 13 external antennas (FCC, IC, ETSI, Japan, Wi-Fi, CE, RoHS) Implementing Wireless Temperature Monitor System In this section we will see how to implement temperature monitor system using SLS Wi-Fi Add On Board on SLS CoreCommander board. To make Wi-Fi connectivity, we will select the WEP Key for network accessibility, network type and IP address for ZG2100. Using the temperature utility we will examine the temperature data wirelessly on the network computer. Figure 2. below shows the block diagram of the system implemented on SLS CoreCommander board for wireless temperature monitor design. Figure 2. Block Diagram CoreCommander LCD Add On Board LCD Display User Push-button Switches LCD Controller Wi-Fi Temperature Monitor System JTAG UART TIMER Wi-Fi Add On Board TMP102 Digital Temperature Sensor ZG2100 Wi-Fi Module USER LED I2C Master SPI (3 Wire Serial) NiosII /F processor Memory Subsystem SDRAM 32 MBytes Flash Memory 8 MBytes Serial Port UART16550 CoreCommander Board PC Nios CPU Altera Peripherals SLS IP Cores External Peripherals 3

4 Implementing TMP102 is used as a temperature sensor which is a low power two wire serial interface sensor. The sensor s SCL pin is connected on J1.4, SDA pin on J1.6, VCC pin on J1.2, GND pin on J1.1 and ADD0 is on J3.6 of SLS Wi-Fi Add On Board. The SLS CoreCommander is programmed with a system which consists of Nios II processor, I2C Master, SPI Master, UART, LCD Controller and other peripheral controller and memory sub-system. The temperature sensor is configured using I2C master to read the temperature of the environment. ZG2100 is configured using SPI master to transmit the temperature data on the network and to receive the LED On/Off data of the board. ZG2100 configuration settings can be seen on the hyper terminal screen using Serial port of the SLS Wi-Fi Add On Board. LCD will display the temperature data received by the sensor after ZG2100 is fully configured. The application contains different pages for WEP Key installation of your router, selecting network and IP address for ZG2100 configuration. The selection is done using the push-buttons switches of LCD Add on board. Figure 3. below shows the pushbuttons switch information used in the application. Figure 3. Key Information of LCD Add On Board on SLS CoreCommander Board The Wireless Temperature Monitor system demonstration file is available at This ZIP folder contains the demonstration files for the wireless temperature monitor system and utility for temperature monitor in the network. 4

5 Application Note Before running the demo, provide authentication of SLS Wi-Fi Add On Board by entering MAC address, which is given on ZG2100M chip, to router if MAC filter option is enabled. Running Temperature Monitor System Before running the application, make sure you have SLS CoreCommander board with LCD Add On Board, SLS Wi-Fi Add On Board and a download cable to download the application. Connect the download cable to J1 header and SLS Wi-Fi Add On Board to J4 header of SLS CoreCommander board. Open Demo folder form the downloaded ZIP folder and double click on run.bat file. It will download the application on SLS CoreCommander board, you will go through the different page settings for ZG2100. Follow the steps below for the page information and settings: 1. First page will provide the information about the demo. Use ENTER key to go to next page. See Figure 4. Figure 4. First Page 2. Second page will asks to select the WEP key Byte selection to provide the accessibility to ZG2100 of your internal wireless network router. Select Short Key (5 Bytes) or Long Key (13 Bytes) as per your WEP key using UP and Down keys. If your network don t have any WEP key security to connect then select None option. After selection press Enter key to go next page. See Figure 5. 5

6 Running Temperature Monitor System Figure 5. Second Page 3. Third page will asks you to enter the WEP key for ZG2100 accessibility in your network. Use UP and DOWN keys to change the key and RIGHT and LEFT keys to select the Next byte. Press Enter key after entering all digits to go to next page. See Figure 6. This page will not displayed if you have selected None option in previous page. Figure 6. Third Page 4. Fourth page asks for selecting the network for the ZG2100 communication either Basic Service Station (BSS) or AD HOC. If you select BSS Network then you can connect to ZG2100 from any PC in your network. If you select ADHOC network then it will connect only one PC in the network. Use UP and DOWN key for Network Selection. Press Enter key to go next page. See Figure 7. 6

7 Application Note Figure 7. Fourth Page 5. Fifth page asks to enter the IP address for ZG2100 to communicate in network. Use RIGHT and LEFT keys to select the IP address number to be changed. Use UP and DOWN key to change the IP address of selected block. Press ENTER key to go to next page or BACK key to go previous page. See Figure 8. Figure 8. Fifth Page 6. Last page will connect ZG2100 into the selected network with information you provided like WEP key and IP address and on successful connection it displays the temperature on the LCD. ZG2100 starts transmitting the temperature data in the network. See Figure 9. 7

8 Conclusion Figure 9. Last Page On successful running the demo, run any one application from from <ZG2100 Demo Installation Path>/zg2100_wifi_aob_cc_demo/Temperature Utility and follow the steps mentioned below: For TCP utility, enter the IP address set in third page and click on Connect button to connect ZG2100. For UDP utility, enter the IP address set in third page, give port number as and click on Connect button to connect ZG2100. As it gets connected it starts plotting graph in the utility. The respected LED on SLS Wi-Fi Add On Board can be turned on/off by selecting LED number in the application and clicking on Apply. Wi-Fi connection can also be verified by executing the following steps. 1. Open Command Prompt. 2. Type ping <IP Address set in Fifth Page>. 3. Press Enter. If ZG2100 has successfully connected in the network then it will give reply to the ping request in the command prompt. Else it displays Request timed out.. Conclusion This application signifies that using SLS Wi-Fi Add On Board, one can connect with existing network without any wired connection. One can also develop a wireless control system to control process. For example you can control the temperature of multiple cabins by turning ON/OFF the fan from any computer connected with same network. You can also monitor multiple 8

9 Application Note parameters like humidity, temperature, CO2 level etc. of different part of your environment on any computer connected with same network. Further you can also develop your own TCP/IP stack to use internet facility. Further Information For more information on SLS CoreCommander board, refer to For more information on SLS Wi-Fi Add On Board, refer to Download wireless temperature monitor system using SLS Wi-Fi Add On Board demo from Revision History The table below shows the revision history. Version Date Description 1.0 First release of the document, Inc. (USA) Murphy Avenue San Martin, CA (408) Copyright 2010,.All rights reserved. SLS, An Embedded systems company, the stylized SLS logo, specific device designations, and all other words and logos that are identified as trademarks and/or service marks are, unless noted otherwise, the trademarks and service marks of SLS in India and other countries. All other products or service names are the property of their respective holders. SLS products are protected under numerous U.S. and foreign patents and pending applications, mask working rights, and copyrights. SLS warrants performance of its semiconductor products to current specifications in accordance with SLS is standard warranty, but reserves the right to make changes to any products and services at any time without notice. SLS assumes no responsibility or liability arising out of the application or use of any information, products, or service described herein except as expressly agreed to in writing by SLS. SLS customers are advised to obtain the latest version of specifications before relying on any published information and before orders for products or services. an_523_1.0 9