change-o-matic

Kaspa Coin Machine. Turn that loose change into digital gold.

Prototype Demo

Live demo

User Interface Demo

Install

Wiring Diagram

Ingridients

• 2 x 10kΩ Resistors
• 1 x 10µF Ceramic Capacitor (106)
• 1 x Raspberry Pi 5
• 1 x Tiny Code Reader (by Useful Sensors)
• 1 x 12V Power source
• 1 x 5V USB-C Power source

Breadboard layout

• The Raspberry Pi and the Coin Acceptor use different power sources (12V and 5V respectively).
• In the future I will use a single power source, but for now I only connect their grounds, to receive the Coin Acceptor signal.

UI

• cd ui

• npm install`

• Set the IP address of the Raspberry PI (where the python script is running) in App.tsx

Server

• consider running in an environment:
  • python -m venv myenv
  • source myenv/bin/activate
  • pip install -r requirements.txt
  • note: when running outside the Raspberry Pi (for example, for testing), remove lgpio from the requirements.txt list

Run

• cd ui

• npm start

• cd server

• python3 click-socket.py

The python script will create a websocket running at `ws://0.0.0.0:8765`. The ui will connect to that server's IP from the browser.

• Open http://192.168.10.10:3000/ (use the Raspberry Pi's IP-Address)

More Info

TODO, known issues, limitations

• The monitor doesn't work properly at the moment. Failed transactions are registered in a separate file, but there's no active resubmission process after 10 minutes.
• I tried to come up with a full python application, but resolved to use the examples from wasm folder as a basis for my sub-processes. I will extract it out of the ruspy-kaspa folder

Thanks and attributions

I Used Raspberry Pi case 3D print model from Tiramisu: https://www.printables.com/model/623697-raspberry-pi-5-case