Install from the Arduino Library Manager:
- LiquidCrystal I2C (by Marco Schwartz https://www.arduino.cc/reference/en/libraries/liquidcrystal-i2c/)
- Keypad (by Chris--A https://github.com/Chris--A/Keypad)
- TM1637 (by Avishay Orpaz https://github.com/avishorp/TM1637)
- Joe Strong
- Stuart Crompton
- Code based on example code from Yvan @ https://Brainy-Bits.com