2 layers40.6 × 39.5 mmLir2450-chargerrbaron/lir2450-chargerA tiny USB C charger for LIR2450 coin cell batteries17 parts17CC-BY-SA-4.0
4 layers49.4 × 21.9 mmLuzrbaron/luzAn ESPHome-capable USB-C Power Delivery trigger board prototype65 parts1