Quantity   Component name
1 × Raspberry Pi Credit card PC
1 × Attiny85 Microcontroller
1 × Lm7805 Linear Voltage Regulator
1 × 3A Buck Converter Buck Converter
1 × DS3231 Clock and Timer ICs / Real-Time Clocks
1 × 3v Battery a Battery,,, that's all...
1 × 25mm FAN a... Fan!
1 × a bunch of resistors and condensers