![]() ![]() ![]() During this process, the bootloader is loaded and checks for a few seconds whether you are trying to send code. DTR to DTR ( Data Terminal Ready) (or BLK): which just keeps the Arduino’s reset state active.This means that the pins can be connected directly or by using wires to each other: To connect the FTDI module to the Arduino, all you have to do is connect the programming pins on both boards accordingly. This chip is in charge of converting the USB signals into UART signals (RS232) which are the ones understood by the Arduino’s microcontroller. In my case I have used an FTDI module that is one of the cheapest ( $1.24 on AliExpress, $5.99 on Amazon) and integrates a FTDI FT232RL chip. ![]() There are several modules on the market that allow us to easily connect a Pro Mini board to the USB input of our computer to do its programming. Main parts of the FTDI USB to serial converter (UART) module. For this reason we will have to work with an external signal converter module to program the board. USB to serial UART boardĪt the expense of this reduction in price, power consumption and size, we will have access to a smaller number of input/output PINs and the lack of a USB port. This is mainly due to the fact that the board has a smaller number of components. ModelĬomparative table of sizes of each Arduino board.Īs you can see on the table the price of the Pro Mini is also a little lower. In both cases, apart from reducing their size, they use less energy than their big brothers (especially in the case of the 3.3V version). It is possible to find them in 3.3V with a processor at 8MHz and with 5V at 16MHz. There are currently two versions of the Pro Mini plates. Oficial Arduino Pro Mini board (by sparkfun) ![]()
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