Raspberry Pi beacon tracker developed with Node.js. You can see it working here.
This is Gabriel Oliveira's term paper, presented at São Paulo State University "Júlio de Mesquita Filho" - Campus of Bauru/SP - Brazil. Se você sabe ler em português, a monografia do TCC pode ser acessado em Monografia-Peacon.
It uses a 16x2 LCD display, 3 push buttons and 6 LEDs to show simple information. This is the case I created:
Distributed under MIT License.