Serial adapters/Arduino
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How to use an Arduino Uno as a serial adapter for an OLPC XO laptop.
- disconnect all wires from the Arduino Uno,
- connect the USB cable to a system (the host) running the Arduino development environment,
- download passthrough-serial-adapter.ino and program it into the Arduino Uno,
- on the host, start a serial terminal application like screen, and verify that pressing keys causes the D13 LED to flash,
- connect a GND pin on the Arduino to the GND pin on the serial connector of the XO (the target),
- connect the D0 (RX) pin on the Arduino to the RX pin on the target; this carries keys from the host to the target,
- connect the D1 (TX) pin on the Arduino to the TX pin on the target; this carries text from the target to the host,
- turn on the target, and the boot text should be displayed.