Quantity   Component name
1 × Xiaomi Mijia Bluetooth Thermometer LYWSD03MMC the main part
1 × Coin Cell Supercapacitor 1.5F 5.5V (e.g. Korchip DCL5R5155VF EDLC)
1 × Germanium Diode should be prefered over Silicon Diode due to less voltage drop
1 × Solar Panel for ambient light conditions a amorphous solar panel works best (up to 5 Voc )