The programming of UNO can be done with a USB cable whereas Nano uses the mini USB cable. So Uno boards use more space on the system. Because Arduino Uno size is double to nano board. The main difference between these two is the size. The Arduino Nano board is similar to an Arduino UNO board including similar microcontroller like Atmega328p. IIC (A4, A5): These pins are used for supporting TWI communication.ĪREF: This pin is used to give reference voltage to the input voltage Difference between Arduino UNO and Arduino Nano Serial Pins (Tx, Rx): These pins are used to transmit & receive TTL serial data. I/O Pins (Digital Pins from D0 – D13): These pins are used as an i/p otherwise o/p pins. RST Pin( Reset): This pin is used to reset the microcontrollerĪnalog Pins (A0-A7): These pins are used to calculate the analog voltage of the board within the range of 0V to 5V 3.3V is the minimum voltage which is generated from the voltage regulator on the board.5V is the regulated power supply voltage of the nano board and it is used to give the supply to the board as well as components.Vin is the input voltage of the board, and it is used when an external power source is used from 7V to 12V.Power Pin (Vin, 3.3V, 5V, GND): These pins are power pins Supports three communications like SPI, IIC, & USARTĪrduino nano pin configuration is shown below and each pin functionality is discussed below.Size of the printed circuit board is 18 X 45mm.ATmega328P Microcontroller is from 8-bit AVR family.The features of an Arduino nano mainly include the following. This board can be supplied with 6 to 20volts using a mini USB port on the board. It doesn’t have any DC jack so that the power supply can be given using a small USB port otherwise straightly connected to the pins like VCC & GND. However, this Nano board is different in packaging. This board has many functions and features like an Arduino Duemilanove board. And other development boards are AVR Development Board, PIC Development Board, Raspberry Pi, Intel Edison, MSP430 Launchpad, and ESP32 board. Other Arduino boards mainly include Arduino Mega, Arduino Pro Mini, Arduino UNO, Arduino YUN, Arduino Lilypad, Arduino Leonardo, and Arduino Due. It is a small size board and also flexible with a wide variety of applications. This microcontroller is also used in Arduino UNO. It can be built with a microcontroller like Atmega328. Then you restart the server and from its point there are magically new data or program or system or what you just did.Arduino Nano is one type of microcontroller board, and it is designed by. ISP - you take out the HDD from the server and simply store the dite directly on it, not asking any system for nothing.You can also picture the difference as this: - normal way - you open web page on server, put some data inside and politly ask the web page to store them somwhere - the page can do it or reject it o modify the data on the way and store them somwhere else, as the web page wish. So while normal programming works only with working bootloader and you can modify such bootloader to do things different way (or do nothing usefull at all, if you make mistake), the ISP goes directly to target HW and communicate with the HW, not with something you can change (like the bootloader).īy ISP you can upload anything anywhere and none program (good or botched) on target chip can prevent you from that. It happens behind curtain and Arduino does not know anything about it. Instead HW encoded pice of code communicate via MOSI (Master Out, Slave In) and MISO (Master In, Slave Out) pins, with timing done by CLOCK pin. While the reset is hold, Arduino does not work, none of your programs are running. On the other hand ISP programming first set RESET on target Arduino (or other chip) and holds it. Basically you are communicating with some program on Arduino and the program (which you can modify) stores some data to Arduino flash memory. When you send in the right commands, it read data from the serial connection (usually converted from USB (Universal Serial Bus) by ATmega8u2) and stores the received data to selected program memory. The normal way you program Arduino is serial, where on the Arduino is loader program (bootloader), which communicates with you. I would like to just add my point of view:
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