To use keypad input to operate a solenoid lockbox:

https://github.com/Ltran0325/MSP432-Solenoid-Lockbox/blob/main/main.c

Hardware:

MSP432P401R LaunchPad: https://www.digikey.com/en/products/detail/texas-instruments/MSP-EXP432P401R/5170609

7-segment display: https://www.digikey.com/en/products/detail/lite-on-inc/LTC-4627JR/408223

4x4 matrix keypad: https://www.digikey.com/en/products/detail/adafruit-industries-llc/3844/9561536

red LED (solenoid): https://www.amazon.com/100pcs-Ultra-Bright-Emitting-Diffused/dp/B01GE4WHK6/ref=sr_1_5?dchild=1&keywords=red+led&qid=1614890774&sr=8-5

Demo:

https://youtu.be/xvXOEY5Ds3I

Criteria:

• Successfully unlock your lockbox (by turning ON the LED connects to P2.5) after you input the correct passcode and press the OPEN key.
• Successfully lock your lockbox (by turning on the LED at P2.5 & blink the LED at P5.0) after you input new passcode and press the LOCK key
• You input a wrong passcode 5 times (LED does not turn on), and get locked for ~1 minute with '-Ld-' show on your display.
• Then you input a correct passcode during the lock-down period but the box does not open (LED at P2.5 does not turn on).
• The 7-segment display should show the passcode you entered every time, whether is correct or not.
• The 7-segment display should show the corresponding characters '-Ld-' & '-LOC' at lock & lock-down state.

Lockbox State Transition Table: