Unsolved

• how to make the sensor more steady?
• no reaction when simultaneously using both FSR and buzzer, but it's OK separately. The code, however, does work with the combination of light sensor and buzzer, so in the week3's lab, I replace the FSR as light sensor.

Solved

• the way of debouncing pushbutton
• power source and the way of connection?
• how to use a multimeter correctly and safely?
• const v.s. int
• delay() v.s. second
• led‘s brightness range
• analog range
• FSR, when giving pressure, resistance value turns low from high