Turning an Arduino of virtually any sort into a simple AVR 6-pin ISP programmer is old hat. But when Atmel came out with a series of really tiny AVR chips, the ATtiny10 and friends with only six pins ...

// Configure the serial port to use. // Prefer the USB virtual serial port (aka. native USB port), if the Arduino has one: // - it does not autoreset (except for the magic baud rate of 1200). // - it ...

This sketch can be used to let one Arduino program a sketch or bootloader into another one, using the ISP programming pins. This sketch is based on OptiLoader, but modified for use with Adafruit's ...