arduino atmel

The microcontroller is preprogrammed with a bootloader so that a dedicated programmer is not required. The modules are programmed with a TTL serial connection, but the connections allowing this programming differ according to the models. The first Arduino had an RS-232 serial port, then the USB appeared on the Diecimila models, while some modules intended for portable use like the Lillypad or the Pro-mini were freed from the programming interface, relocated On a dedicated USB-serial module (in the form of a card or cable), it also made it possible to reduce their cost, the TTL USB-to-serial converter (an FTDI232RL from FTDI) is quite expensive.

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