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. Have a look at Step 2, Load MegaCore with Optiboot as the Boot Loader for a Mega 2560.Arduino Uno Rev3 Pin Headers and Components If you run into issues, though, the forums say sometimes there’s not enough power and you may need to power the target board separately. The 5v of power should be sufficient from the programmer board to power the target board. In addition, the Arduino tutorial referenced above has instructions to use pins 7, 8, and 9 as indicators of the burning process if you’re interested, but I won’t go into them here. Since five of these wires are straight through, you might use a six pin connector and simply cut pin 5 and solder on a jumper. The reset pin of the target Mega 2560 must be wired to pin 10 of the programmer Mega 2560. You can simply wire jumpers from board to board using these pins with a single exception. The pins are laid out as follows: The ICSP pin configuration. Note the white mark in the upper left corner marking pin 1. This is a 2 x 3 group of pins next to the processor. The Mega 2560 enlarged to show detail of ICSP headers and the white dot marking pin 1 in the upper left corner.įirst, have a look at your Mega 2560 and find the ICSP pins. Note there are similar six pins near the USB, but these are not used in this process. The ICSP Pins A Mega 2560 board with the ICSP headers highlighted in orange. You can either do this with six wire jumpers or a standard six pin cable and a little surgery. This tutorial will show you how to use another Mega 2560 to replace the boot loader of a Mega 2560. The first step in replacing the boot loader on an Arduino board is having an In System Programmer (ISP). This is the first step in the series Code Loading an Arduino over Bluetooth.
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