5 replies to this topic

[zee]

Hi,

 

I got an error when deploy piezo. An error message box pop up "An unhandled exception of type 'System.Exception' occurred in mscorlib.dll".. Can anyone please help me where is the problem?

[Stefan]

Hi Zee,

 

Could you please post some code? Right now, that error could mean anything

[zee]

Hi Stefan,

 

Here's the code below:

 

 

 

public static void Main()

{

// write your code here

 

// store the notes on the music scale and their associated pulse lengths

System.Collections.Hashtable scale = new System.Collections.Hashtable();

 

// low octave

scale.Add("c", 1915u);

scale.Add("d", 1700u);

scale.Add("e", 1519u);

scale.Add("f", 1432u);

scale.Add("g", 1275u);

scale.Add("a", 1136u);

scale.Add("b", 1014u);

 

// high octave

scale.Add("C", 956u);

scale.Add("D", 851u);

scale.Add("E", 758u);

 

// silence ("hold note")

scale.Add("h", 0u);

 

int beatsPerMinute = 90;

int beatTimeInMilliseconds =

60000 / beatsPerMinute; // 60,000 milliseconds per minute

int pauseTimeInMilliseconds = (int)(beatTimeInMilliseconds * 0.1);

 

// define the song (letter of note followed by length of note)

string song = "C1C1C1g1a1a1g2E1E1D1D1C2";

 

// define the speaker

PWM speaker = new PWM(Pins.GPIO_PIN_D5);

 

// interpret and play the song

for (int i = 0; i < song.Length; i += 2)

{

// extract each note and its length in beats

string note = song.Substring(i, 1);

int beatCount = int.Parse(song.Substring(i + 1, 1));

 

// look up the note duration (in microseconds)

uint noteDuration = (uint)scale[note];

 

// play the note for the desired number of beats

speaker.SetPulse(noteDuration * 2, noteDuration);

Thread.Sleep(

beatTimeInMilliseconds * beatCount - pauseTimeInMilliseconds);

 

// pause for 1/10th of a beat in between every note.

speaker.SetDutyCycle(0);

Thread.Sleep(pauseTimeInMilliseconds);

 

}

 

Thread.Sleep(Timeout.Infinite);

}

 

 

 

Thanks for your help!

[zee]

Sorry.. the PWM i editted it to SecretLabs.NETMF.Hardware.PWM speaker = new SecretLabs.NETMF.Hardware.PWM(Pins.GPIO_PIN_D5);

[zee]

Sorry Stefan.. My typo error.. Instead of 'i', I accidentally typed '1'..

 

instead of :

 

string note = song.Substring(i, 1);

int beatCount = int.Parse(song.Substring(i + 1, 1));

 

 My silly mistakes:

string note = song.Substring(1, 1);

int beatCount = int.Parse(song.Substring(1 + 1, 1));

 

Sorry for the Inconveniences cause..

[Chris Walker]

Hi zee, Which line of code is causing the exception? Try setting a breakpoint on the first line of your code and then press F8 to run one line of code. When that's done, press F8 again. Repeat until you get the exception. Chris