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CapSense and organic materials Interactive materials spring 2016 Stacey Kuznetsov [email protected]

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  • CapSense and organic materials

    Interactive materialsspring 2016

    Stacey [email protected]

  • Schedule•  Monday (today)

    –  Review transistors / last week’s challenge–  capSense–  Paper presentations

    •  Wednesday (Feb 24)–  Max MSP Lecture (interfacing Arduino w Sound)

    •  Monday (Feb 29)–  Qualitative research methods–  Practice fieldwork methods–  Prepare for Wednesday

    •  Wednesday (March 2)–  Midterm!

  • Capacitive sensing•  Low or no force sensing•  Detect touch through insulating material (plastic,

    wood, ceramics)•  Detect proximity to conductive material (fruit,

    tin foil, metal)•  A thin layer of insulator (tape or paper) can

    create a pressure sensor

  • Capacitive sensing

  • Capacitive sensing Send  Pin   Receive  Pin  

  • Capacitive sensing Send  Pin  sends    “HIGH”  

    Receive  Pin  

  • Capacitive sensing Send  Pin  sends    “HIGH”  

    Receive  Pin  eventually  gets  HIGH  value  

  • Capacitive sensing•  A measure of time•  How long it takes for the sense pin to change

    state•  Time = R * C

    R = resistor

    C = capacitance at the receive pin, plus any other capacitance (e.g. human body interaction) present at the sensor (receive) pin

  • Capacitance•  The ability to store electrical charge•  Everything can store charge!

  • Capacitor

  • Capacitor

  • Capacitor

    electroly9c  dielectric  

  • Capacitor •  Capacitance: how much charge it can store •  One farad (F) is the capacity to store one unit of

    energy (coulombs) per every one volt

  • Capacitor •  Capacitance: how much charge it can store

  • Capacitor

  • Capacitor

  • Capacitor

  • Decoupling/bypass capacitor •  Make your circuit more stable

    –  If there is a temporary drop in power, caps can supply voltage

    – Caps “bypass” the drops in “big” power supply •  Filter certain frequencies and noise

    – Store or smooth power ripples – Advanced signal processing (filter out low

    frequencies, allow high frequencies)

  • Capacitive sensing Send  Pin  sends    “HIGH”  

    Receive  Pin  eventually  gets  HIGH  value  

  • Capacitive sensing Send  Pin  sends    “HIGH”  

    Receive  Pin  eventually  gets  HIGH  value  

  • Capacitive sensing Send  Pin  sends    “HIGH”  

    Receive  Pin  eventually  gets  HIGH  value  

    This  is  sort  of  like  a  capacitor  

  • Capacitive sensing Send  Pin  sends    “HIGH”  

    Receive  Pin  eventually  gets  HIGH  value  

    This  is  sort  of  like  a  capacitor  

    This  is  actually  a  capacitor  4   2  

  • hAp://playground.arduino.cc/Main/Capaci9veSensor?from=Main.CapSense  

  • hAp://playground.arduino.cc/Main/Capaci9veSensor?from=Main.CapSense  

  • Include  capSense  library  

  • Declare  what  pins  capSense  is    hooked  up  to  

  • Experiment  with  autocalibrate  

  • Get  capSense  values  

  • Print  a  bunch  of  Debug  stuff  

  • What  is  this  number  30?  

     Cart  61  –  90  

  • Pin  2  is  the    sense  pin  

    Pin  4  is  the    send  pin  

  • Capacitive sensing Receive  Pin  

    Pin  2  Pin  4  Send  Pin  

  • Capacitive sensing Receive  Pin  

    Pin  2  Pin  4  Send  Pin  

    I  need  a  resistor  here  

  • Cool,  but  what  value  should  I  use??  

  • hAp://playground.arduino.cc/Main/Capaci9veSensor?from=Main.CapSense  

  • Maybe  I  will  start  with  5  megaohm…  

  • Am  I  done??  

  • Am  I  done??  

  • Am  I  done??  

  • Am  I  done??  

  • Am  I  done??  

  • Capacitive sensing Receive  Pin  

    Pin  2  Pin  4  Send  Pin  

    A  capacitor  will  make  this  circuit  more  stable  

  • Cool,  but  what  value  should  I  use??  

  • hAp://playground.arduino.cc/Main/Capaci9veSensor?from=Main.CapSense  

  • hAp://playground.arduino.cc/Main/Capaci9veSensor?from=Main.CapSense  

  • Maybe  I’ll  start  with  200pF  


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