Making an Arduino shield can be simpler than you think. This time I designed one to program Attiny and Atmega microcontrollers, that way I don't have to use a breadboard and make the wiring to program ...

Upon boot, the bootloader expects a 'p' via the UART. When this char is not sent after a small amount of time, the boot process continues. When the device is in flash mode, the system expects a Intel ...