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[on:]

As an example I added a frequency generator to http://code.google.com/p/m2tklib/ (GLCD version of m2tklib).
Only a graphics display and some input buttons are required for a nice frequency generator with adjustable duty. The display also shows the hardware values, because not all values can be created by the ATMEGA.



Oliver

[Reply #1 on:]

  Nice job! That could be very useful!

Mark

[Reply #2 on:]

Hallo Oliver,
Dein Projekt ist genau das, was ich gesucht habe, Danke dafür.

Leider funktioniert (bei mir) irgendetwas nicht richtig.
Arduino 1.0.1 und m2tklib_arduino_glcd_1.08. der Rahmen um die Eingabefelder ist viel zu klein, Real Freq und Real Duty = 0
Arduino 1.0.1 und m2tklib_arduino_glcd_1.05. der Rahmen um die Eingabefelder passt, Real Freq und Real Duty = 0, Lautsprechen an Pin 3 kein Signal

es wäre toll, wenn es dafür eine Lösung gibt.

Gruss
Kurti

[Reply #3 on:]

Hallo Kurti

Please excause for switching back to english.

Many many thanks for reporting that bug. I have corrected M2tklib and uploaded the new release 1.08.1
Please download v1.08.1 from http://code.google.com/p/m2tklib/downloads/list.

I have verified that the singal is available at pin 3 (Arduino Duemilanove)

Thanks,
Oliver

[Reply #4 on:]

It looks like you are driving an 8 ohm speaker directly from an Arduino pin.
The datasheet recommends no more then 40mA per pin. 5v / 8 ohms = 625mA. Far too high.
I recommend putting a resistor of around 220 ohms in series but even 100 ohms will be better then nothing.
Better yet is to use a transistor driver with base resistor.

[Reply #5 on:]

Hi,
I got it, it's working !

the program is:
uint8_t uiKeySelectPin = 0;
uint8_t uiKeyDownPin = 1;
uint8_t uiKeyUpPin = 2;

the function is:
Switch at pin 0 = +1 and Enter
Switch at pin 1 = select
Switch at pin 2 = no function

You have to push the select-button to put the cursor to the right position.
Then push the +1 button to select the number.
After making the setting push the select button until Apply is highlighted.
Then push the +1 button ( enter )

Thanks for this sketch
Kurti

[Reply #6 on:]

@smeezekitty

You are right, the resistor will add some safety to the hardware. However, to my knowledge, the current is also limited by the controller itself.


@kurti

In order to use all three buttons, you need to exchange the button handler. Instead of
M2tk m2(&top_el_gridlist, m2_es_arduino, m2_eh_2bs, m2_gh_glcd_ffs);
use
M2tk m2(&top_el_gridlist, m2_es_arduino, m2_eh_4bs, m2_gh_glcd_ffs);

Oliver

[Reply #7 on:]

Hi,
I tried your fix and it's working, the switch at pin 2 has a function.

I checked the signal at pin 3 with my osci:
- the calculation of the real duty has nothing in common with the signal
( Test 300 Hz, 50 Duty -> Real Freq.: 300, Real Duty 102, Frequency changed to 800 Hz, Real Duty changes to )
- the Frequency Generator only works above 60 Hz

Thanks for your tries
Kurti