![]() ![]() It has the same effect as connecting the RST pins to the ground.Īrduino Uno Rev3 Reset Button Arduino Uno Rev3 Reset Button ICSP Header The reset button can be used to restart the microcontroller or to put it into bootloader mode for uploading new sketches. They can be used for reading analog signals such as temperature sensors, light sensors, and potentiometers.Īrduino Uno Rev3 Analog Pins Arduino Uno Rev3 Analog Pins Reset Button The board provides 6 analog input pins labeled A0 to A5 connected to its 10-bit ADC. So it's better not to use them until you really ran out of digital pin for your project.Īrduino Uno Rev3 Digital Pins Arduino Uno Rev3 Digital Pins Analog Input Pins It's because they're used for serial communication when the board is connected via USB to computer. The first two digital pins D0 and D1 are labeled as RX0 and TX1. ![]() you don't connect it to to either of 5V or GND) it will be read as HIGH. When a pin mode is set to INPUT_PULLUP, the given pin will be internally connected to the 5V so that if the given pin is floated (i.e. When the pin mode is set, you can read the value of an input pin like this: pin3Value = digitalRead ( 3 ) // read current value of the pin 3 previously set as inputĪlso to write a digital value to a pin, you can call the digitalWrite function passing one of the constant values HIGH or LOW along with the pin number to write it to: digitalWrite ( 5, HIGH ) // set pin 5 value to 5V This should be specified first using the pinMode function as below: void setup ( ) This is explicitly mentioned in the documentation of digitalRead() function.Ī digital pin can be used either as input or output pin. Also all the analog pins of the board can be used as digital pin. The main processor of the Arduino Uno Rev3 is the ATmega328 microcontroller in 28-pin SPDIP (Shrink Plastic Dual-in-Line Package).Īrduino Uno Rev3's Microcontroller Arduino Uno Rev3's Microcontroller Digital I/O PinsĪrduino Uno Rev3 has 14 digital input/output pins labeled from D2 to D13. The Arduino Uno Rev3 board size measures 53.4mm x 68.6mm.Īrduino Uno Rev3 Dimensions 53.4 mm 68.6 mm Arduino Uno Rev3 Dimensions The ATmega328 Microcontroller In this section we review the Arduino Uno Rev3 pinout and will have an overview on its physical properties as well as major components on the board. If Iâve confused you anywhere, post your code and tell us which pins youâve used for each device, weâll show you where to edit your software so it matches what youâve done in hardware.Arduino Uno Rev3 Pin Headers and Components Again, the pin you use must appear in the object constructor in your software. The second device needs its own CS pin and you can use any digital pin you desire. The CS on pin 53 can only be connected to one device, it does not matter which one but it needs to match the software pin declaration. ![]() You can use those pins in addition to those on 50, 51 and 52 as they are connected in parallel on the pcb. The six pin connector to the right of the atMeag2560 processor are the duplicate pins Nick is referring to. Those are the SPI pins for the dedicated USB to serial converter atMega processor. I know there is a separate 6 pin by the reset button is also for MOSI ![]()
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