List of what you need:
(I bought everything on Banggood but you can find the same displays cheaper on aliexpress . Thx voyager3 ).
- Geekcreit® ATmega328P Nano :
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https://www.banggood.com/ATmega328P-Nano-V3-Controller-Board-Compatible-Arduino-p-940937.html?rmmds=search&cur_warehouse=USA
- 3 Red Displays :https://www.banggood.com/3Pcs-RobotDyn-Red-LED-Tube-4-Digit-7-segments-Display-Module-For-Arduino-DIY-p-1144447.html?rmmds=search&stayold=1&cur_warehouse=CN
- 3 Yellow Displays : https://www.banggood.com/3Pcs-RobotDyn-Yellow-LED-Tube-4-Digit-7-segments-Display-Module-For-Arduino-DIY-p-1144435.html?rmmds=search&cur_warehouse=CN
- 3 Green Displays : https://www.banggood.com/3Pcs-RobotDyn-Green-LED-Tube-4-Digit-7-segments-Display-Module-For-Arduino-DIY-p-1144434.html?rmmds=detail-top-buytogether-auto__1&cur_warehouse=CN
- Real Time Clock Module : https://www.banggood.com/Wholesale-New-Arduino-I2C-RTC-DS1307-AT24C32-Real-Time-Clock-Module-Board-for-AVR-ARM-PIC-p-46446.html?rmmds=search&stayold=1&cur_warehouse=CN
- Wires Male to Female : https://www.banggood.com/40pcs-20cm-Male-To-Female-Jumper-Cable-Dupont-Wire-For-Arduino-p-973822.html?rmmds=myorder&cur_warehouse=UK
- Wires Male to male: https://www.banggood.com/40pcs-20cm-Male-To-Male-Color-Breadboard-Cable-Jumper-Cable-Dupont-Wire-p-70127.html?rmmds=myorder&cur_warehouse=UK
- Leds : https://www.banggood.com/375pcs-3MM-5MM-LED-Light-emitting-Diode-Beads-Resistance-Lights-Kits-Bulb-Lamp-p-1027601.html?rmmds=myorder&cur_warehouse=UK
- 5V power supply adapter : https://www.banggood.com/5V-1A-Mini-USB-Wall-Charger-AC-Power-Supply-Adapter-EUUS-Plug-for-GPS-MP3-Radio-Speaker-Camera-etc-p-1031193.html?rmmds=search&ID=43101&cur_warehouse=CN