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EBlocks – Electronic Building Blocks for Sensor-Based Systems Frank Vahid Professor Dept. of Computer Science and Engineering University of California,

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Presentation on theme: "EBlocks – Electronic Building Blocks for Sensor-Based Systems Frank Vahid Professor Dept. of Computer Science and Engineering University of California,"— Presentation transcript:

1 eBlocks – Electronic Building Blocks for Sensor-Based Systems Frank Vahid Professor Dept. of Computer Science and Engineering University of California, Riverside Assoc. Director, Center for Embedded Computer Systems, UC Irvine Support provided by the National Science Foundation and Intel Contributing students: Susan Lysecky (PhD 2006, Asst. Prof. at U. Arizona), Ryan Mannion (former UCR ug/grad student), Andrea Lyons (senior), Caleb Leak (BS 2007, now UCLA MS student), Shawn Nemetebakshi (MS 2005), plus about a dozen undergraduate students past and present

2 Frank Vahid, UC Riverside2/29 The Problem What do these problems all have in common? An aunt with a visiting niece who sleepwalks, worried the niece will leave the house or get hurt A working adult with an ageing parent at home – did she get out of bed today, is she moving around? A small store owner wishing to track employees – are they in the storeroom, breakroom, or out back – or customers A homeowner who sometimes forgets to close the garage at night Marines wishing to outfit a building to detect whether someone is inside or when someone was inside

3 Frank Vahid, UC Riverside3/29 The Problem What do these problems all have in common? Put motions sensors around the house, connected to a beeper next to the bed Put motion sensors around the house, monitor from the web or cell phone – or even be notified if no motion by certain time in the morning Put motion and sound sensors throughout, small LEDs (lights) near cash register Install contact sensor and light sensor, and indicator next to the bed Place motion, heat, and sound sensors in rooms, halls, doorways

4 Frank Vahid, UC Riverside4/29 Why Can’t We Just Do This? LED receive contact switch light sensor AND transmit Widely usable “Lego”-like sensors don’t exist today Costly, hard to use, plugged into wall smarthome.com (x10.org)... But new technology makes Lego-like sensor blocks possible...

5 Frank Vahid, UC Riverside5/29 Shrinking Processor Size/Cost Enables New Solution

6 Frank Vahid, UC Riverside6/29 Shrinking Processor Size/Cost Enables New Solution Moore’s Law also means chips can be SHRUNK 1980 – 10,000 transistors about 1 sq cm (fingernail) Today – size of a spec of dust 3 yrs 6 yrs 9 yrs 12 yrs 15 yrs

7 Frank Vahid, UC Riverside7/29 Shrinking Processor Size/Cost Enables New Solution Make sensors smarter By adding processor+battery Today, tiny and cheap Becomes a "block" easily connected to other blocks http://www.templehealth.org Courtesy of Joe Kahn

8 Frank Vahid, UC Riverside8/29 Shrinking Processor Size/Cost Enables New Solution – eBlocks Existing component viewNew "eBlock" view Button yes/no Light Sensor yes/no Magnetic Contact Switch yes/no LED yes/no Beeper Electric Relay yes/no

9 Frank Vahid, UC Riverside9/29 eBlocks Just connect blocks, and they work No programming knowledge, no electronics knowledge Button yes/no LED yes/no Beeper yes/no Light Sensor yes/no

10 Frank Vahid, UC Riverside10/29 eBlocks Add intermediate blocks that compute and maintain state Spatial programming – more intuitive to non-CS people than temporal programming Button Beeper LED Light Sensor Tripper Prolong 1 2 3 4 5 6 7 8 9 Combine AND OR yes no When A isyes no B is then the output is yes Button Toggle Button Light Sensor LED

11 Frank Vahid, UC Riverside11/29 What's Hard (The Research Part) (1) Finding right set of building blocks Toggle Splitter Tripper 2-Input Logic 3-Input Logic Splitter 4-Input Logic Splitter Prolong (short) 1 2 3 4 5 6 7 8 9 Prolong (long) 1 2 3 4 5 6 7 8 9 Combine AND OR yes no When A isyes no B is then the output is yes Too many – Overwhelming (too much choice) 2 Yes detector 2 No detector Too few – Overwhelming (too much configuration) SuperBlock 1 2 3 4 5 6 7 8 9 AND OR yes no When A isB is then the output is yes 1 2 3 4 5: Splitter 1 2 3 4 5 6 7 8 9 6:...

12 Frank Vahid, UC Riverside12/29 What's Hard (The Research Part) (2) Making the blocks understandable People NOT likely to read directions Those that do are unlikely to understand ABOutput noyesno yesnoyes noyes no yes Logic Block configurable DIP switch A B Combine A is yes, B is yes A is yes, B is no A is no, B is yes A is no, B is no The output shouldbe yes when: yes no: Phrased truth table yes no the output should be AB When the input is out Combine A is yes, B is yes A is yes, B is no A is no, B is yes A is no, B is no Phrased truth table embedded in sentence yes no The output should be When the input is out AB AB AB AB AB Combine Colored truth table embedded in sentence Combine AND OR yes no When A is yes no B is then the output is yes Logic Sentence Example: Combine block Performed extensive user testing (over 500 students, kids, and adults) over two years Most success

13 Frank Vahid, UC Riverside13/29 What's Hard (The Research Part) (3) Batteries must last years, yet performance should appear continuous Blocks are off 99.9% of the time time ft f (a) (b) (d) (c) error << ftfff << interpreted as Developed theory to map eBlock events to continuous time Developed custom CAD tool to automatically find the best block parameter settings out of the billions of possibilities

14 Frank Vahid, UC Riverside14/29 eBlocks Prototypes >100 prototypes, size of deck of cards (trend: smaller) 2-3 years on 2 AA batteries (trend: longer) Can communicate via wire >1.5 miles, 150 ft wireless Integer blocks too

15 Frank Vahid, UC Riverside15/29 eBlocks Example "Garage Open at Night" detector <10 minutes to build Need to indicate garage open at night – use LED block LED Detect night-time – use Light Sensor block Light Sensor Detect garage door open – use Contact Switch block Magnetic Contact Switch Plug pieces together and the system is done! Use Combine block to combine light sensor and contact switch into one Combine AND OR yes no When A isyes no B is then the output is yes

16 Frank Vahid, UC Riverside16/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Green/Red Light Beeper Output Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes

17 Frank Vahid, UC Riverside17/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Button

18 Frank Vahid, UC Riverside18/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Button Light Sensor

19 Frank Vahid, UC Riverside19/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Button Light Sensor Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Combine AND OR yes no When A isyes no B is then the output is yes

20 Frank Vahid, UC Riverside20/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Button Light Sensor Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Combine AND OR yes no When A isyes no B is then the output is yes Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Green/Red Light Beeper Output Beeper

21 Frank Vahid, UC Riverside21/29 Combine AND OR yes no When A isyes no B is then the output is yes Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging User is able to configure various blocks by clicking on switches Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Button Light Sensor Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Green/Red Light Beeper Output Beeper

22 Frank Vahid, UC Riverside22/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging User is able to configure various blocks by clicking on switches Connections created by drawing lines between blocks Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Button Light Sensor Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Green/Red Light Beeper Output Beeper Combine AND OR yes no When A isyes no B is then the output is yes

23 Frank Vahid, UC Riverside23/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging User is able to configure various blocks by clicking on switches Connections created by drawing lines between blocks User can create, experiment, test and configure design Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Light Sensor Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Green/Red Light Beeper Output Beeper Combine AND OR yes no When A isyes no B is then the output is yes Light Sensor Button

24 Frank Vahid, UC Riverside24/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on a connected port. To move a block around the workspace, click and drag its orange area. Blocks can be moved into the trash can to delete them. Green circles indicate that the port is sending a yes, red circles indicate that the port is sending a no, yellow Circles indicate that the port is sending an error signal, and gray circles denote an input port.  User specifies and tests block design  Java-based simulator User chooses between pallets Blocks added by dragging User is able to configure various blocks by clicking on switches Connections created by drawing lines between blocks User can create, experiment, test and configure design Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Light Sensor Available eBlocks Advanced ModeHide this panel Green/Red Light Beeper Output Motion Sensor Yes/No Button Light Sensor Sensors Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Available eBlocks Advanced ModeHide this panel Compute/Communications Prolonger 1 2 3 4 5 6 7 8 9 seconds Once Yes, Stays Yes rst in Toggle Combine AND OR yes no When A isyes no B is then the output is yes Motion Sensor Yes/No Button Light Sensor Sensors Green/Red Light Beeper Output Beeper Combine AND OR yes no When A isyes no B is then the output is yes Light Sensor Button

25 Frank Vahid, UC Riverside25/29 Related Uses – Embedded System Development with Sensors Can greatly simplify coding and reduce development time Interface to PC, cell phone, PDA also possible e.g., Front-end to smart home system Button yes/no Light Sensor yes/no 1/0 Micro- processor

26 Frank Vahid, UC Riverside26/29 Other Uses – Sensor Network Front-End Front end to existing/evolving sensor network nodes (e.g., motes) Motion Sensor Combine AND OR yes no When A isyes no B is then the output is yes Mote

27 Frank Vahid, UC Riverside27/29 Use virtual blocks in graphical simulator to describe desired sensor system behavior Intuitive due to spatial emphasis, not temporal emphasis Automatically compile to code on programmable eBlocks eBlocks as a Programming Paradigm Programmable eBlocks Partitions

28 Frank Vahid, UC Riverside28/29 eBlock Tool Generates Code Tool generates C code automatically #include #include “sci.h” #include “io.h” #include “constants.h” Unsigned char data_val = ERROR;... main(void) { unsigned I, j; TRISB = 0;... } main(void) { ORTA = 0xff; CMCON = 0x07; TRISA = 0x00; TRISB = 0x02; asm("CLRWDT");... } C Code Download code to block with click of a button Ordinary users can “write” programs in minutes Spatial vs. temporally-oriented language 20 high school graduates: eBlocks (spatial) vs. LEGO Mindstorms (temporal), 6 example systems, 40 minutes to build Programmable eBlock Type Average Success Rate Mindstorms 0% eBlocks 54%

29 Frank Vahid, UC Riverside29/29 Summary and Current Focus eBlocks enable large segment of population to build customized sensor systems themselves Current focus – Applications Hearing/vision impaired – customize homes Aging at-home parents – privacy-respecting monitoring (live at home longer) Middle school kids – excite them about engineering Univ. of Arizona also researching education aspect Engineering – fast prototypes Patent pending, likely to be commercialized in next 5 years

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