Open Bitcoin ATM using arduino

Open Bitcoin ATM

The world’s first completely open-source Bitcoin ATM for Education and Experimentation.

http://openbitcoinatm.org for more information.

Open Bitcoin ATM

Step 1: Fabricate Box and Faceplate

Out of a piece of 12″x12″ aluminum sheet metal, cut two rectangles and drill six rivet holes and four holes to attach the bill acceptor. 

Cut aluminum angle into two 11 1/2″ lengths.

For each aluminum angle, drill and tap two holes; drill three faceplate rivet holes.

Rivet the two aluminum angles to each side of the faceplate. Allow room (about 1/8″) to overlap with the front of the box to create flush surface; make sure aluminum angles are positioned to lie flush on the inside of box.

Drill four holes through the box that exactly align with tapped holes in aluminum angle.  (tip: if using acrylic, set drill to reverse, and gently apply pressure to prevent cracking).

Measure 16″ leads, solder  one end to barrel plug and other end to J2 connectors.  Attach barrel plug to back of box. Tape leads to base of box.

Step 2: Attach Bill Acceptor and Printer

Position printer in faceplate and attach using bracket provided. 

Position bill acceptor and attach using four screws, washers and nuts.

Step 3: Provision Arduino

Download and install Arduino environment from here. 

Download openbitcoin.ino from here https://github.com/mayosmith/openbitcoinatm

Attach Arduino Uno to computer USB port.

Upload openbitcoin.ino to Arduino Uno.

http://openbitcoinatm.org for more information.

Step 4: Attach Resistor and Leads

Solder resistor and leads to SD shield as shown (note updated circuit diagram with pull up resistor)

Open Bitcoin ATM

Step 5: Attach SD Shield and Components

Attach SD shield to Arduino Uno.

Cover back of Arduino Uno with insulating tape.

Attach 5V power supply to back of faceplate (high strength velcro works well).

Attach Arduino/SD shield to back of faceplate with (high strength velcro).

Connect J2 connectors.

Step 6: Create QR Codes

Create a few dozen private keys at bitaddress.org.

Convert private keys to 176 x 176 pixel QR codes (sample pictured above).

Convert QR codes to thermal printer format. Sample QR code in thermal printer format:  BTC_4.btc (see http://openbitcoinatm.org for more information)

Here’s a hack that makes this process a snap:

https://github.com/mayosmith/BitcoinQRMaker

Here’s a wallet that can read the QR code:

https://blockchain.info/wallet/

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