The detailed discussion on this module and programming of the Arduino PRO MINI will follow in the post later. However in order to make programming easier and handy the manufacturers have released a module that acts as the bridge between USB and UART. Notice here that the Arduino PRO MINI has no USB interface on board which means it cannot be programmed through your laptop USB COMM PORT. Thus it becomes handy to program the Arduino UNO with the help of your computer. The programmer found on board in case of the Arduino UNO is basically the USB to serial data bridge which converts the USB data into the UART and SPI data. In order to make the size smaller the designers has taken out the serial programmer from the Arduino Pro Mini. ![]() An important difference between the Arduino UNO and Arduino PRO MINI as pointed out earlier is the Hardware design that is Arduino PRO MINI lacks the on board-programmer. Arduino PRO MINI has 14 digital Input / Output pins out of which 6 are PWM (Pulse Width Modulation) enabled and 8 Analog pins. It should be noted here that all of the communication ports that are found on the Arduino UNO are also available on the Arduino PRO MINI microcontroller development board. The Arduino PRO MINI has one UART (Universal Asynchronous Receiver and Transmitter), one SPI (Serial Peripheral Interface) and one I2C (Inter-Integrated Circuit) computer bus. The main difference lies in the hardware design of the board. ![]() ![]() That is the Arduino PRO MINI microcontroller development board is designed around the ATMEGA328P microcontroller IC so that most of the features of the Arduino UNO and Arduino PRO MINI are the same. The Arduino PRO MINI microcontroller development board is quite small in size as compared to the more common Arduino UNO but it is based ATEGA328P. Arduino PRO MINI microcontroller development board is the variant of the Arduino UNO microcontroller board with specific perks and quirks.
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