SOLVED - DigiSpark Tone() Statement

[Granz]

I posted this on the DigiSpark forum, but thought that I might ask here too, in case anyone here might have an idea:

I'm having troubles with the tone() statement.

My circuit is just connecting a speaker to an I/O pin, and then through a resistor to ground:


(Sorry about the flipped image, not sure why the forum software wants to put it upside-down.)

When I upload the sketch (I hate that term, when I upload the program), I get no sound:

Code: Select all

//A sketch to demonstrate the tone() function

//Specify digital pin on the Arduino to which the positive lead of the speaker is attached.
 int SpkrPin = 0;

void setup() {
    pinMode(SpkrPin, OUTPUT);
} //close setup

void loop() {

  tone(SpkrPin, 2000);

//  digitalWrite(SpkrPin, HIGH);
//  delay(2);
//  digitalWrite(SpkrPin, LOW);
//  delay(2);

}

I have tried with and without the pinMode() statement, and have also added a digitalWrite() statement to initially set the pin high (and low) - I saw someone somewhere say that you needed that.

When I uncomment the digitalWrite() statements to toggle the I/O pin, and comment out the tone() statement, I get a tone. Changing the delay() statements works as expected. The scope (connected to the green line on the schematic) shows: (BTW, thanks for the 'scope Jason, it has come in handy.)


In addition, I have tried all 6 of the I/O pins, none of them give a tone (all show 0V on my scope, except for P5, which shows constant high.)

When I switch to an Arduino Uno, I get the tone from the speaker, using either the digitalWrite, or the tone() statements.

Does anyone have any ideas where I am going wrong?

[Granz]

For closure:

PeterF, over on the Digistump forum (http://digistump.com/board/index.php/topic,2857.0.html) was able to give me an answer that worked. It turns out that on the Digispark, the tone() function only sets up the tone. To actually hear it, you need to have a delay. Apparently, the full-sized Arduino plays tones in the background, but this does not work on the Tiny85 (the controller for the Digispark.)

[zappman]

For closure:

PeterF, over on the Digistump forum (http://digistump.com/board/index.php/topic,2857.0.html) was able to give me an answer that worked. It turns out that on the Digispark, the tone() function only sets up the tone. To actually hear it, you need to have a delay. Apparently, the full-sized Arduino plays tones in the background, but this does not work on the Tiny85 (the controller for the Digispark.)

Thanks for this info, as I may be getting some Digistump Tiny85 boards.

[Granz]

...Thanks for this info, as I may be getting some Digistump Tiny85 boards.

Glad I could help. They really are pretty cool little things. I love that they plug directly into the USB port (or a USB extension cable.)