• build something interesting!

  • A little piano with five chinese music scales

    １　２　３　５　６

    宫　商　角　徵　羽

    

    • 5 buttons represent 5 piano keys for Do, Re, Mi, So, La, 1 force sensing resistor for controlling the volume.
    • Discover the fun effects given by the force sensing resistor! and press two keys at the same time!

    https://www.youtube.com/watch?v=EfWSX8HGJzM

• Analog output

  • “fake” an analog voltage by producing a series of voltage pulses at regular intervals, and varying the width of the pulses. This is called pulse width modulation (PWM)

• implicit design

  • Attentional Demand / Initiative

  

Questions:

• Why 5V pin does not give 5V voltage? VIN pin gives
• How to wrap the wire onto the potentiometer?
• How to use arrays in Arduino? Can we extend the arrays after defining them? Like the add() function in JS?
• Difference between ~ and A3 for example? I thought A3,A4, etc. mean the pins are capable to analogWrite/Read, then what is ~? pins 2, 3, 5, 6, 9, 10, 11, 12, A2, A3, and A5 generate PWM signal, Does it mean that these pin can analogWrite? Can they analogRead?
• In the little Chinese piano project, why were the sound flickering between two notes when pressing two buttons at the same time?
• Why does the tone made by self-made tone function sound different from the tone generated by tone function? Is it because

delayMicroseconds()

is not accurate enough?

To-Do:

• Try the parameter in delay() and the third parameter in tone()