KaffeeSATS
Pay With Lightning. Drink Coffee.
Open-source Bitcoin coffee machines powered by the Lightning Network, LNbits, Offline Bitcoin Switch and ZapBox.
Open-source Bitcoin coffee machines powered by the Lightning Network, LNbits, Offline Bitcoin Switch and ZapBox.
Uses a Sunton ESP32 smart display and the LNbits Offline Bitcoin Switch. Users pay with Lightning, receive a secret PIN and unlock the machine.
Uses ZapBox, LNbits and NFC Bolt Card support. The ZapBox sends a 5V signal to an internal relay after payment.
Scan a Lightning Invoice or tap a Bolt Card.
The relay enables the original Tassimo start button.
Press the yellow Tassimo button.
The coffee machine starts brewing.
Instant Bitcoin payments for real-world coffee.
Tap-to-pay support with the ZapBox edition.
Offline verification using the LNbits Offline Bitcoin Switch.
Relay interface, 3D printed parts and documentation.
LNbits Offline Bitcoin Switch fully operational.
Lightning & Bolt Card payment support operational.
3D files, wiring guides and documentation available.
KaffeeSATS is an open-source Bitcoin hardware project that connects Lightning payments with real-world machines.
The idea is simple: Bitcoin should not only be explained — it should be experienced. With KaffeeSATS, visitors can scan a Lightning invoice, tap a Bolt Card, unlock a coffee machine and receive a real cup of coffee.
The project was built to demonstrate how LNbits, ZapBox, ESP32 hardware, relays and 3D printed parts can work together in a practical Bitcoin use case.
Built by a Bitcoiner, for Bitcoiners.
Bitcoin enables instant, borderless and permissionless payments.
KaffeeSATS demonstrates how Lightning payments can interact directly with physical hardware in the real world.
No cash. No cards. No intermediaries. Just Bitcoin and coffee.
If you like KaffeeSATS, please consider giving the project a star on GitHub. It helps other Bitcoiners discover the project.
25 July 2026
Build your own Bitcoin coffee machine in one day.
19 September 2026 – Arnhem
Visit the KaffeeSATS booth for live demos.
