====== Arduino based node ======

===== Components =====
  * ATmega328 (with Arduino bootloader)
  * RFM69HW 868MHz or 915Mhz module
  * MCP1700 3.3v Voltage Regulator
  * 28pin DIL IC Socket
  * 2x 1uF Ceramic Cap
  * Various headers and sockets
  * Stripboard

===== Guide =====
==== Step 1 ====
  * Solder 28pin DIL IC socket to the strip board
  * Cut traces along the centre of the socket
  * Check that there is no conductivity between the two halves
{{:guides:p1010049.jpg?300|}}
==== Step 2 ====
  * Solder voltage regulator with 1uF capacitor
  * Connect voltage output to Vcc as well as ground
  * Solder header for Serial (Tx and Rx)
{{:guides:p1010051.jpg?300|}}
==== Step 3 ====
  * Program the ATmega328 with the arduino bootloader
  * Upload simple script to the micro
  * Connect up the usb-serial convertor and test that everything is working
==== Step 4 ====
  * Solder connecting wires to RFM69HW (GND, NSS, SCK, MISO, MOSI)
  * Line up with the ATmega328's corresponding pins. You'll need to bend your connecting wires a bit to fit through the holes in the strip board. Solder these in place.
  * The other 2 pins that need to be connected are VCC and DIO0 which are best connected with insulated wire.
    * VCC -> 3.3v
    * DIO0 -> pin 2 (Interrupt 0)

{{:guides:p1010056.jpg?300|}}
==== Step 5 ====
  * Upload repeater script to test RFM69HW
  * Check either with Funcube or that it is repeating to other nodes
    * Its been found that some modules are slightly off frequency and so need adjustment to match. The easist way is to use a funcube or RTL dongle and then adjust the frequency to line up with other nodes.
==== Step 6 ====
  * Solder antenna to ANT and GND pins
{{:guides:p1010058.jpg?300|}}
===== Schematic =====
{{:guides:arduinodesign.png|}}
===== Uploading new arduino scripts =====
  * As the current arduino is programmed just to use its internal oscillator it has a special board identification which needs to be added to your IDE. You need to find the boards.txt and add to the end

For Arduino 1.6.1 use this script:
<code>
##############################################################

atmega328bb.name=ATmega328 on a breadboard (8 MHz internal clock)

atmega328bb.upload.tool=avrdude
atmega328bb.upload.protocol=stk500
atmega328bb.upload.maximum_size=30720
atmega328bb.upload.speed=57600

atmega328bb.bootloader.tool=avrdude
atmega328bb.bootloader.low_fuses=0xE2
atmega328bb.bootloader.high_fuses=0xDA
atmega328bb.bootloader.extended_fuses=0x07
atmega328bb.bootloader.path=arduino:atmega
atmega328bb.bootloader.file=atmega/ATmegaBOOT_168_atmega328_pro_8MHz.hex
atmega328bb.bootloader.unlock_bits=0x3F
atmega328bb.bootloader.lock_bits=0x0F

atmega328bb.build.mcu=atmega328p
atmega328bb.build.f_cpu=8000000L
atmega328bb.build.core=arduino:arduino
atmega328bb.build.variant=arduino:standard
</code>
Otherwise for older versions of Arduino use this:
<code>
##############################################################

atmega328bb.name=ATmega328 on a breadboard (8 MHz internal clock)

atmega328bb.upload.protocol=stk500
atmega328bb.upload.maximum_size=30720
atmega328bb.upload.speed=57600

atmega328bb.bootloader.low_fuses=0xE2
atmega328bb.bootloader.high_fuses=0xDA
atmega328bb.bootloader.extended_fuses=0x07
atmega328bb.bootloader.path=arduino:atmega
atmega328bb.bootloader.file=ATmegaBOOT_168_atmega328_pro_8MHz.hex
atmega328bb.bootloader.unlock_bits=0x3F
atmega328bb.bootloader.lock_bits=0x0F

atmega328bb.build.mcu=atmega328p
atmega328bb.build.f_cpu=8000000L
atmega328bb.build.core=arduino:arduino
atmega328bb.build.variant=arduino:standard
</code>
  * On Mac OS X: <code>/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/</code>
  * On Windows : <code>hardware/arduino/</code>
  * On Linux: <code>/usr/share/arduino-1.0.5/hardware/arduino</code> though the version number might be different.

  * Restart the Arduino IDE and you can now select ATmega328 on breadboard and upload

===== Programming =====
  * Get the latest repeater code from [[https://github.com/UKHASnet/UKHASnet_Firmware|github]]
  * Make sure you update your node ID and location and other settings
  * Upload via serial to the board.
  * Some additional programming notes with tips for Windows users can be found here: [[:arduino_stripboard_windows_programming|Programming Arduino Nodes using Windows]] 

====== Troubleshooting ======

  * Everything appears to run 8x slower
  *   * Using an ICSP Programmer, 'Burn Bootloader' in the Arduino IDE to set the fuses. This will disable the DIVIDE-BY-8 function.