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Jellybean

Ingredients needed

  • LND Lightning implementation
  • Raspberry Pi
  • A candy dispenser with electric motor

Hardware

Vending machine and Raspberry Pi instructions here. Basically you will need to wire up a simple common-emitter amplifier to give the Raspberry Pi GPIO pins enough power to drive a motor. Ignore the stuff about the 21 Computer and refer to the Raspberry Pi pinout diagram here.

Note: Adafruit also sells a pre-assembled motor controller board which does the same thing, although I have not tried it myself.

Software

Server

The Lightning node and the payment page can both run on the Raspberry Pi. Or, a separate web server if you prefer. Instructions for installing the web app:

$ git clone https://github.com/elaineo/Jellybean
$ cd Jellybean/jellybean-server
$ npm install

Modify the web socket address in views/index.html (line 278) to match your server address. Change the port numbers in app.js to reflect your own ports. The server app opens a stream with the Lightning node, which will pass a message upon receiving new or settled invoices.

process.env variables:

NODE_TLS_REJECT_UNAUTHORIZED=0 
GRPC_SSL_CIPHER_SUITES=ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384

Run:

$ node app.js

Client

The Raspberry Pi controllers are in this root directory. When you run client.js, it will create a socket connection to the web server (set this on line 20). Use localhost if the web server is hosted on the Pi.

Run:

$ node client.js

Once the client is connected, the server will issue messages for the Pi to activate its GPIO pins and turn the vending machine.