The easiest ever self build of a fully functional DCC Command station with PCB available on eBay plus only a few parts. The App formats each DCC packet for transmission via Bluetooth to Arduino Pro Mini connected to a h-bridge to form a simple DCC command station with few parts. * Control of 1 to 20 locos * Ideal for small to medium size layouts * 2 Amps load drives up to 16 of OO/HO locomotives using H-bridge specified * Add a higher current compatible h-bridge to extend load capacity * Short