No separate burner is required to compile and burn the program as this board comes with a built-in boot-loader. Arduino Nano Pinout. Arduino Uno is a microcontroller board based on Atmega328 and comes with 14 digital I/O pins out of which 6 are PWM. There are 6 analog pins incorporated on the board.

Contents • • • • • • • • • • • • Burning the Sanguino Bootloader to the ATmega 644P using an Arduino as an ISP. So you just finished soldering up your Sanguinololu, Gen7 or whatever board and are ready to test it to see if everything is working properly, but before you can upload any firm ware to the board you need to burn a Bootloader to the ATmega 644P. In this tutorial I will cover using an Arduino or Arduino clone as your ISP programmer. NOTE: Instead of breadboarding, you could use the 6-pin ISP connector found on most RepRap electronics. No tutorial or pictures so far. -- 10:20, 23 April 2013 (UTC) Hardware Needed Note that the 16mz resonator is missing from this photo. Before we get started with the tutorial make sure you have the following tools and discrete components on hand and ready to use.

• Arduino or Arduino Mega with FTDI USB interface. (pre Arduino UNO boards) Also any Arduino clone with an FTDI chip will work. • USB Cable • Solderless Bread Board with at least 50 positions on each side • 16Mhz resonator • 0.1uf ceramic capacitor • 3x 5mm LEDs • 1x 1k resistor • 25 Jumper wires NOTE: For voltage stability you might want to an external power supply instead of USB power. This is not usually required if your USB port can supply the required current, but is recommended for most chip burners and programmers.

NOTE: if you use an Arduino Mega, you need different wiring: see Software needed • Arduino 0018 to 0023 or 1.0.1 ( ) DO NOT USE the ArduinoISP sketch from Arduino 1.0!!!! It is Broken. See for details • Sanguino software ( ) DO NOT USE the atmega644 hex files in the 0023 versions - you will get 'out of range' errors on uploading. There's a bug in the Makefile that has a bad '--section-start' value and loads the bootloader too high in RAM. The only one that works on that site is the 0018 hex file.

A good version of the latest Sanguino bootloader can be found What is a Bootloader? In short a Bootloader is a small piece of code that is stored in the microcontroller's program memory and allows the user to program and reprogram the microcontroller without using an In System Programmer (ISP). I won't get into the full details of what a Bootloader does in this tutorial, but if you would like to know more check out this article on Emcelettronica.com ( ) What is an ISP?

ISP is short for 'In System Programmer', a device that allows you to program a microcontroller without using a Bootloader. It can be used to burn Bootloaders, and program microcontrollers where a USB interface is not present. In our case we will be using an Arduino with an ATmega 328 to burn the Sanguino Bootloader to our ATmega 644p.

Setting up the Arduino Before we can burn the Sanguino Bootloader we need to program to Arduino to act as an ISP. Follow the steps below and we can move on to breadboarding the ATmega 644P. • The first thing you need to do is connect your Arduino to the PC with a USB cable. • Next, In the Arduino IDE go to File/Examples/ArduinoISP. This will load the Arduino as ISP sketch into Arduino. 1 • Make sure you have the correct board selected in Tools/Board/ Your Arduino Board.

Fig.2 • Once that sketch is open click the “play” arrow to compile and upload the sketch to the Arduino. 3 The Schematic Click for high resolution version. 4 NOTE: Recently Sanguino has been ported to use the Arduino Core. The Sanguino is now compilable and uploadable easily with Arduino IDE 1.0.4 or above using Optiboot loader.

Atmega644p and Atmega1284p are now build and uploadable sketches on latest Arduino IDE. No special steps have to be followed.

Only the zip file contents have to be copied to the /arduino/hardware folder. Close the IDE and restart the IDE. The Sanguino is ready to rock and roll with the latest Arduino IDE 1.0.5 Details on how to use Sanguino with optiboot can be found on Bhashatech blog.

Burning the Bootloader • Now that you have installed Sanguino files to the Arduino IDE and connected the ATmega 644p (double check again) we can finally burn the Sanguino Bootloader to the chip. • In the Arduino IDE go to Tools/Board/ and select Sanguino.

Fig.5 • Then make sure the correct COM port is selected by going to Tools/Serial Port and select the one that your Arduino is connected to Fig. 6 • Before we go any farther check every connection again and make sure everything is connected exactly the way shown in the schematic above. If you are confident in your connections then you are ready to burn the bootloader. • Go to Tools/Burn Bootloader and click w/ Arduino as ISP Fig.7 • You will see the TX and RX LEDs flash on your Arduino for about 1-2 minutes. DO NOT UNPLUG THE USB CABLE or touch any part of the circuit at this time. Doing so may damage the ATmega 644P or Arduino beyond repair. • When the flashing is has stopped for more than 30 seconds you may unplug the USB cable from the Arduino and carefully remove the ATmega 644P from the breadboard.