Keypad-Interfacing

A 4x4 Membrane Keypad is mapped with STM32F407 board. Key detection is recognized by board LEDs as programmed.

Objective:

If pressed

• 1 - Blink LD3 (Orange) 1x
• 2 - Blink LD4 (Green) 1x
• 3 - Blink LD5 (Red) 1x
• A - Blink LD6 (Blue) 1x
• 4 - Blink LD3 (Orange) 2x
• 5 - Blink LD4 (Green) 2x
• 6 - Blink LD5 (Red) 2x
• B - Blink LD6 (Blue) 2x
• 7 - Blink LD3 (Orange) 3x
• 8 - Blink LD4 (Green) 3x
• 9 - Blink LD5 (Red) 3x
• C - Blink LD6 (Blue) 3x
• * - Blink LD3 (Orange) 4x
• 0 - Blink LD4 (Green) 4x
• # - Blink LD5 (Red) 4x
• D - Blink LD6 (Blue) 4x

Mapping:

8x pins of Keypad - MCU mapped

1. R1 -> PD0
2. R2 -> PD1
3. R3 -> PD2
4. R4 -> PD3
5. C1 -> PD8
6. C2 -> PD9
7. C3 -> PD10
8. C4 -> PD11