Hardware

The MediaCup hardware environment consists of the MediaCup, an IrDA compatible infrared network and and a wireless recharging unit to supply MediaCups with energy

MediaCup-electronic

-- > Responsible: Holger Krull, Michael Beigl

  • complete electronics integrated into the rubber bottom of the cup
  • collects sensor data: acceleration, movement, temperature
  • evaluates sensor data, knows about its state. E.g. the MediaCup knows if someone drinks, if someone plays with the cup or if the cup stands on the desk
  • behaves according to knowledge about its state, e.g. powers down; communicates state to backbone network
  • used in the TecO lab as everyday cups, no special knowledge or behaviour needed
  • unobtrusive wireless recharing
  • communication through infrared (IrDA encoding) either with backbone infrared network or with Laptop or PC with IrDA interface
  • unpersonalized because cup electronics change at every cup "washing interval"
  • but: every cup contains a unique IPv4 adress

-- > Technical details

  • Microprocessor: Arizona Microchip PIC16F84 at 4 MHz (V1.2) or 1 MHz (V1.3)
  • Communication: IR-LED: Siemens SFH409-s (V1.2), H-P HSDL 4420 (V1.3)
  • Temperature Chip: Dallas Semiconductor DS1621
  • Acceleration: ADXL202AQC (V1.2), 1 button & 3 ball switches (V1.3)
  • Power: Lithium (V1.2) lifetime: 2-3 weeks; 2F Panasonic GoldCap 5.5V (V1.3) lifetime: min. 6 hours, average 10 hours
  • Recharging: Wireless (V1.3) via induction; recharging time max. 15 min
  • Power consumption: normal:<2mA, sleep: 1ľA
  • Measurement, Communication intervals: Depend on the software release

-- > Schematics, Software, Notes for users

MediaCup Electronic
 

Wireless Recharger

-- > Responsible: Holger Krull, Michael Beigl

  • allows to wireless recharge MediaCups
  • uses induction (ultrasonic frequency)
  • operates at 18 V
  • almost as small as a saucer replaces "normal" cup saucers, providing an unobrusive way to reload cups

-- > Schematics, Software, Notes for users

 

charger.jpg (19506 bytes)

charger2.jpg (13327 bytes)

Infrared Network and CAN node (IrC R(2))

-- > Responsible: Albert Krohn, Michael Beigl

  • builds the wireless communication backbone for MediaCups
  • receives IrDA encoded IR signals and transmits them
  • allows IrDA capable devices (PDAs, Laptops, etc.) to communicate e.g. to surf the Web
  • network nodes are interconnected through a CAN bus
  • very low cost, easy to set up, self healing backbone communication
  • wired through twisted pair cable (TP4) containing data & power lines
  • CAN network is connected to the backbone network (e.g. ethernet/Internet) through a PC (either through a CAN card or via serial communication)
  • every CAN node knows about his location
  • allows a 1.5x1.5m^2 IR footprint and a max. range of 2 m
  • IR operates at 19200 bit/s
  • CAN throughput depend on network size

-- > Technical details

  • Microprocessor: Arizona Microchip PIC16F877 at 20 MHz
  • IR Communication: IrDA: 4 x H-P HSDL 1001
  • IrDA encoding: H-P HSDL 7001
  • CAN-Communcation: Phillips SAJ1000
Infrarot zu CAN Knoten