An AVR device, based on ATTiny85, to transmit a virtual wall signal for an iRobot Roomba

• /firmware
  • Source for the ATTiny85 firmware
• /hardware
  • Files describing the board layout, etc
• /christmas_tree_barrier
  • Files describing the board layout for the Christmas tree barrier variation

• Raspberry Pi configured with BCM SPI enabled
• AVR-GCC installed
  • Easiest way to get this is 'sudo apt-get install arduino'
• Either:
  • A 6-position, dual-row IDC cable (recommended)
  • Or jumpers to wire SPI bus of Raspberry Pi to the ISP pads on the finished board

• Order a board based on the files in https://github.com/Petezah/roomba_wall_v2/tree/master/hardware
  • Alternately, order one directly from OSH Park here: https://oshpark.com/shared_projects/yCviCn7Z
• Purchase parts from Mouser electronics using the current BOM
  • Use the ones with "mouser" in their filenames
• Assemble the board--parts are all marked on the silkscreen
  • NB: The ISP header should not be soldered to the board--merely insert the header pins into the IDC cable and wedge the pins into the vias during programming

There are two methods to wire the board for programming:

• Recommended way:

  • Order my Raspberry Pi ISP board here: https://oshpark.com/shared_projects/iYtnPahC
  • Assemble, and use an IDC cable as described above

• Alternate way:

  • Hook up the ISP pins on the assembled board to your Raspberry PI as follows:
    • ISP Pin 1 --> Raspberry Pi Pin 21 (MISO)
    • ISP Pin 2 --> Raspberry Pi Pin 17 (3.3V)
    • ISP Pin 3 --> Raspberry Pi Pin 23 (SCK)
    • ISP Pin 4 --> Raspberry Pi Pin 19 (MOSI)
    • ISP Pin 5 --> Raspberry Pi Pin 15 (GPIO22)
    • ISP Pin 6 --> Raspberry Pi Pin 25 (GND)

Once wiring is accomplished:

• Execute the following on the Raspberry Pi command line
  • cd firmware
  • make fuse
  • make install