poor-mans-yun

Arduino Yun functionality using a $20 WR703N router and a $3 Arduino Pro Mini.

This allows you to upload sketches to the Arduino Pro Mini over Ethernet or WLAN from the Arduino IDE, just like with the Arduino Yun.

So far I did not attempt to port the Bridge, since it seems rather bloated to me.

Materials used

• WR703N router (do NOT use WR702N) from eBay or Aliexpress, around $20 shipped
• $3 Arduino Pro Mini from eBay, around $3 shipped

Soldering

• Solder Arduino pin VCC to WR703N +3.3V
• Solder Arduino pin GND to WR703N Ground
• Solder Arduino pin RST to WR703N GPIO 29 signal = R17-South
• Solder Arduino pin RX to WR703N TP_OUT signal = C55-West
• Solder Arduino pin TX to WR703N TP_IN signal = R82-North

For information on the WR703N pins, see http://wiki.openwrt.org/toh/tp-link/tl-wr703n#gpios

Preparing Arduino IDE

Edit boards.txt so that it contains the following line:

pro.upload.via_ssh=true
```

Preparing WR703N
----------------
Install OpenWrt on the WR703N. Set a ssh password. Then install the "announce" package and finally run the script from this repository on the WR703N.

How this works
--------------
The Arduino announces itself to the network using Zeroconf. The Arduino IDE sees this and uses ssh into the machine. There it runs /usr/bin/merge-sketch-with-bootloader.lua (this is a blank script in our case) and then it runs /usr/bin/run-avrdude (this is where the magic happens and where avrdude is invoked to flash the Arduino).