Big thanks to the fine people at Hack-A-Day for sharing this with the world!
if you'd like to donate to the project: https://www.suprmasv.com/projects/167/blu-board
This project has been in the works for along time, three months if I reckon Correctly, but anyways, this device will allow you to control devices in your home, whether it be your homes thermostat or your lights it all can now be done over blue tooth with ease. so lets begin.
Step 1: Step 1: sourcing parts
you will need the following parts :
bareduino kit : $8.95
2 channel relay : $5.85
bluetooth module : $8.52
random header pins and sockets~$2.00
small piece of pcb~$2.00
programmer (optional) $9.00
enclosure (optional) $19.51
a led ~10 cents
Step 2: Step 2: producing main board
first we must produce the pcb for this device, in this instructable im not going to go over how to etch a pcb, if you dont know, just google it, anyways i designed the pcb in inkscape and it is available for download here in a zip file. EDIT: peter__s created a gcode file as well if you wish to mill the board. thanks peter!
Step 3: Populate the pcb
solder up your components as the image shows, this should be relatively self explanatory at this point, just make sure that the chip has its notch pointing to the left and that the led has its long leg going to the a0 pin on the chip.
Step 4: Relay controller modifications
this next step is going to require you to use a header socket to replace the control pins on the relay module, this will require some de-soldering which can be tricky if youve never done it before . basically it should look like this when your done
Step 5: Header construction
on the main board we have to use some extra long header pins to create a connection to the relay module, to do this cut a segment of header pins that is 4 pins long and push the little plastic piece to the end of the pins like shown in the photos and then push it through the board and solder it in place like so.