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The Personal Sensor Network: a User-Centric Monitoring Solution BodyNets 07, Firenze 13 Giugno 2007 S.K.S. Gupta, IMPACT Lab, Arizona State University G. Giorgetti, G. Manes, Dip. Elettronica e Telecom., Università degli Studi di Firenze J.H. Lewis, Sal T. Mastroianni, Embedded Systems Research, Motorola Labs “Out of the Box” WSNs Enabling Technologies: Iris MicaZ Imote2 Mica2Dot Mica2 + TelosB Commercially available sensor boards Open source OS with support for ad hoc networking Remote Monitoring Applications Mesh sensor network Server Gateway More Sensor Network Applications… Is a computer always necessary (or desirable) ? Emergency Response Health Care Recreational Applications The Power in Your Hands • Computation • Communication (GPRS, WiFi, Bluetooth,…) • User Interface (Hi-Res display, Multimedia,…) • Development Tools (Java, .NET,…) … and much more Phone to WSN Interface Design Principles: • To minimize the changes to the existing WSN architecture (required to maintain backward compatibility with previous apps.) • To leverage COTS hardware and existing software solutions (to minimize the development time). Issues to address: • Phone to sensors interface • Data handling on the cell phone Monitoring and Control Software Phone to sensor interface: We evaluated three options: 1. Direct Connection 2. WAN Connection 3. Bluetooth Option 1: Direct Connection Pros: • Low Power • Reliable Serial Port The phone is physically connected to one of the sensor nodes Cons: • Portability • Interface • Cumbersome Option 2: WAN Connection GPRS WiFi Internet WEB TCP/IP Server Pros: • Standard progr. tools (i.e. sockets) • Apps (Browser) Cons: The phone uses a WAN connection to access the WSN information • No local access • Cost Option 3: Bluetooth Pros: • Universal Connect. • Ubiquitous Cons: • Custom interface needed on the GW The phone uses a Bluetooth connection to access the WSN information Standard Data Flow TinyOS Pkt Data TinyOS Pkt Data 0101101100110 RS232 / USB TinyOS Pkt Processing Cmd &Data Storage 0101101100110 WSN TinyOS Gateway Cmd Transparent Data Forwarding Data Data UART Cmd MCU Radio Cmd Bluetooth Gateway RS232 / USB Data Data Radio MCU UART Cmd Cmd TelosB with the Bluetooth Module BlueRadios BR-C40A With Serial Port Profile Cmd Data BT RFCOMM Software on the Phone Bluetooth RFCOMM Phone Software: • Establishes the connection to the BT gateway • Handles the TinyOS packet structure • Coverts the raw sensor data in engineering units • Provides the users with a GUI • Dispatch control commands to the WSN Software on the Phone (cnt’d) IDEN i870 Version MIDlet written using J2ME: • MIDP 2.0 • CLDC 1.1 • Bluetooth API (JSR-82) Moto Q version The software on the phone is based on a “stripped down” version of the JAVA classes distributed with TinyOS for packet handling Java Software The Personal Sensor Network Demo Questions? WSN on the Q Phone Motorola Q Phone: - Windows Mobile 5.0 Smartphone edition - Java support: IBM WebSphere Everyplace Micro Environment 6.1 (MIDP2.0, free download)