From Arduino to a Microcontroller on a Breadboard This tutorial explains how to migrate from an Arduino board to a standalone microcontroller on a breadboard. It's similar to, but uses an Arduino board to program the ATmega on the breadboard. Unless you choose to use the minimal configuration described at the end of this tutorial, you'll need four components (besides the Arduino, ATmega328, and breadboard): • a 16 MHz crystal, • a 10k resistor, and • two 18 to 22 picofarad (ceramic) capacitors. Burning the Bootloader If you have a new ATmega328 (or ATmega168), you'll need to burn the bootloader onto it. You can do this using an Arduino board as an in-system program (ISP).

If the microcontroller already has the bootloader on it (e.g. Because you took it out of an Arduino board or ordered an already-bootloaded ATmega), you can skip this section. To burn the bootloader, follow these steps: • Upload the ArduinoISP sketch onto your Arduino board.

(You'll need to select the board and serial port from the Tools menu that correspond to your board.) • Wire up the Arduino board and microcontroller as shown in the diagram to the right. • Select 'Arduino Duemilanove or Nano w/ ATmega328' from the Tools > Board menu. (Or ' ATmega328 on a breadboard (8 MHz internal clock)' if using the minimal configuration described below.) • Select 'Arduino as ISP' from Tools > Programmer • Run Tools > Burn Bootloader You should only need to burn the bootloader once. After you've done so, you can remove the jumper wires connected to pins 10, 11, 12, and 13 of the Arduino board. Using an Arduino board to burn the bootloader onto an ATmega on a breadboard. Uploading Using an Arduino Board Once your ATmega328p has the Arduino bootloader on it, you can upload programs to it using the USB-to-serial convertor (FTDI chip) on an Arduino board.

To do, you remove the microcontroller from the Arduino board so the FTDI chip can talk to the microcontroller on the breadboard instead. The diagram at right shows how to connect the RX and TX lines from the Arduino board to the ATmega on the breadboard.

To program the microcontroller, select 'Arduino Duemilanove or Nano w/ ATmega328' from the the Tools > Board menu (or ' ATmega328 on a breadboard (8 MHz internal clock)' if you're using the minimal configuration described below). Then upload as usual.

So to upload via the bootloader -> arduino's avrdude, to upload via isp -> normal avrdude (don't know avr-studio and where it has instal it. As an extra, you can see the command line used by the arduino software to communicate with the bootloader by pressing MAJ when compiling/uploading.

Uploading sketches to an ATmega on a breadboard. Remember to remove the microcontroller from the Arduino board! Minimal Circuit (Eliminating the External Clock) If you don't have the extra 16 MHz crystal and 18-22 picofarad capacitors used in the above examples, you can configure the ATmega328 to use its internal 8 MHz RC oscillator as a clock source instead. (You don't really need the 10K pullup resistor on the reset pin either, so we remove it to get a truly minimal configuration.) You'll need to install support for an additional hardware configuration: • Download this hardware configuration archive:, or depending on which IDE you use.

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• Create a 'hardware' sub-folder in your Arduino sketchbook folder (whose location you can find in the Arduino preferences dialog). If you've previously installed support for additional hardware configuration, you may already have a 'hardware' folder in your sketchbook. • Move the breadboard folder from the zip archive to the 'hardware' folder of your Arduino sketchbook. • Restart the Arduino software.

• You should see ' ATmega328 on a breadboard (8 MHz internal clock)' in the Tools > Board menu. Once you've done this, you can burn the bootloader and upload programs onto your ATmega328 as described above. Be sure to select ' ATmega328 on a breadboard (8 MHz internal clock)' when burning the bootloader. (If you select the wrong item and configure the microcontroller to use an external clock, it won't work unless you connect one.) Attention This procedure works on Arduino 1.0.x software.