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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.

About

Jellybean vending machine for Lightning network and raspberry pi

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