USBASP drivers

On Linux and MacOS this step should not be necessary. On Windows, install Zadig and install the libusbK (v3.1.0.0) driver (libusb-win32 (v1.2.6.0) did not work for me).

Connections

1. Enable the slow mode with a jumper (JP3).
2. Connect the USBASP to the ATtiny (bear in mind the orientation of the USBASP pinout, check if it’s not mirrored when using a ribbon cable).

     USBASP                 
+--------------+             ATTINY    
|1 MOSI  VCC 10|         +------u------+
|              |         |1 RST   VCC 8|         10 (VCC) → 8 (VCC)
|2 GND    TXD 9|         |             |         1 (MOSI) → 5 (MOSI)
|              |         |2       SCK 7|         3 (RST)  → 1 (RST)
|3 RST    RXD 8|         |             |         4 (SCK)  → 7 (SCK)
|              |         |3      MISO 6|         6 (GND)  → 4 (GND)
|4 SCK    GND 7|         |             |         5 (MISO) → 6 (MISO)   
|              |         |4 GND  MOSI 5|
|5 MISO   GND 6|         +-------------+
+--------------+         

Arduino IDE setup

1. Go to File → Preferences. In Additional Boards Manager URLs paste: https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json
2. Go to Tools → Boards → Board Manager. Search for attiny and install the boards.
3. In Tools, set board, processor, and clock to the values corresponding to the chip.
4. In Tools, set programmer to USBasp.

Troubleshooting

• 1 second delay results in an 8 second delay:
  • The device runs at 1 MHz instead of 8 MHz - go to Tools → Burn Bootloader to make it run at 8 MHz.