Design and Realization of a Prototype Hardware Platform for ...

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The MegaWatch Wireless PlatformMaster's Thesis - Emanuel Corthay6 The MegaWatch Hardware Platform Design• Received signal strength indicator• 2-level FSK digital modulation• Maximum range around 100 meters in buildings for low speed, high power transmissionFigure 13 Xemics XM-1202 Development Kit6.4.2 WiFi LinkFor simplicity, it was obvious that a simple off-the-shelf CompactFlash Wireless LAN card(802.11b) would be perfect to serve as a real time monitoring wireless interface. The infrastructureavailable at EPFL (WiFi base stations) is already present; Linux drivers exist; and low cost highvolume WiFi components are very easy to find.Table 2 WiFi Compact Flash Card ComparisonThe difficulty at this stage was to integrate it into the system. Not surprisingly, given the 2.4 GHzhigh frequency used, it was shown that the antenna part of the Compact Flash card must be clearof all obstacles for the link to work. In particular, if a ground plane is close to the antenna, the linkdoes not work. The antenna part of the card has been placed as to stick out of the unit to avoidthat problem.A lot of the referenced cards below were discarded for various reasons, and in the remaining lot,the Pretec was chosen simply because it had been successfully tested in the LSA2 EPFLlaboratory during the Swarm-BOT project[20] in similar conditions, and under ARM Linux.Moreover, we were able to get a good price by joining the order of WiFi cards for the two projects.30 / 83
The MegaWatch Wireless PlatformMaster's Thesis - Emanuel Corthay6 The MegaWatch Hardware Platform DesignFigure 14 Pretec WiFi CardIts main characteristics are:• CompactFlash connector type I• 802.11b DSSS at 11, 5.5, 2 or 1 Mbps, max 14 dBm output power• Power consumption max 370 mA in transmit mode, 250 mA in receive mode and 20 mA instandby mode• Linux drivers available for the Intersil Prism 2.5 integrated chipsetThe purpose of the WiFi card is threefold:• Provide an independent radio link for monitoring purposes• Provide a bridge possibility with the infrastructure network, thus providing a bridge to theinternet• Be available as a second radio interface for 802.11b ad hoc applications and testing6.5 MegaWatch Extension BoardThe extension card supports three major functions of the system. It must provide a practicalinterface to plug the two radio link modules, provide an easy-to-use Human-Machine-Interface, andintegrate a power measurement circuit.The Figure 15 shows the general structure of the board. Each part is then discussed separately togive a good understanding of the design choices.31 / 83
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The MegaWatch Wireless PlatformMast
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The MegaWatch project : Alim boardW
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MEGAWATCHLSM E.Corthay MFG_DATE: 01
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68591056.3577.2231927.11.03LSM-LAP
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3213434121243214321551K1K1K1KR10R11
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EPFL ACORT Mon Dec 1 08:47:30 2003
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Component Report MEGAWATCHmegawatch
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Single Node Nets Report MEGAWATCHme
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Qii8i¡,//4$-r G D/- ’KK•-4K*M.
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EPFL ACORT Thu 22.01.2004 11:21 Dra
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EPFL ACORT Thu Jan 22 11:21:21 2004
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Component Report SABUSALIMsabusalim
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BOM Report SABUSALIMsabusalim_gloss
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¬†hx€ƒq‚}ƒr r {o{€ H:
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{€}~{ƒ~€z’{r~{{}€rq~h „k
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Signal Page Ref ROKEPXA_Brokepxa Th
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10000000000100NC1510KR119U11VALD19B
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Component Report ROKEPXA_Brokepexa_
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BOM Report ROKEPXA_Brokepexa_gloss
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Power Pins Report ROKEPXA_Brokepexa
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Extensions Milli-BUS RokEPXAA24 MB_
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Extensions Milli-BUS RokEPXAA24 SPI
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24 MHzrf_TRX_moduletxSpeed3 = ctrl3
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-- Modify here if you change the st
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doEmerBut => doEmerBut,inhibitEmer
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xFifoReadEn -- ctrlreg32if (writeE
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futurestate txBusyTmp
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egPayload
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edge)-- If we reached the end of th
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-- ################################
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RxStbis in std-by)TxStbis in std-by
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when idleRx =>rxEn
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uf:process (clk, reset)beginif rese
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ReadPointer
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end process;-- Bufferize the signal
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when emerPressed =>bufferedEmerButt
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process (clk, reset)beginif (reset=
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component sreg8port ( clk : in std_
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-- Signals to and from the TXchip_e
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component IO_Ctrlport ( clkclkTXres
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File: avalon_bus.vhd[…]-- Above:
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eginif reset = '1' thencurrentstate
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----------------------------------s
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