HI...

I want to build music tone using pic16f84? so i can make a sound. This is to be used in our project in Microcontroller subject (ex: a pic musical doorbell project).

How to understand the conversion of the tones in assembly codes...?
How to do that?

Can anybody show me how to convert any music to an assembly program?

 

Essentially you just turn a pin ON and OFF to generate a tone, you might have a look at this C example for ring tones
http://www.beyondlogic.org/pic/ringtones.htm

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

It should be other way isn't it????.....
A beep is generated from turning on & off an output pin number of times. But for buzzers it different. & to generate a tone or Tune need some effort to do that.

A simple method is applied here for PIC16F84A
http://www.talkingelectronics.com/Pr...nts_page1.html

__________________
Gayan

My Website
http://gsmicro.blogspot.com/

 

You find a good one in the Labcenter Electronic's Proteus examples.

 

Thanks for the reference (http://www.beyondlogic.org/pic/ringtones.htm)
...so i need to understand about RTTTL (Ringing Tones Text Transfer Language)..Can anybody explain what is RTTT..pls?
so i can convert music tone to assembly code...I will use piezo speaker of my project...i'll just hope that it will create a different sounds with 2 or more inputs...

i really need effort of this.....

tnx...

 

The website above has links to everything you need to know, you don't have to use RTTL - it's just convenient if you want to play tunes.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

You do not need to understand RTTT. It would be overkill.

The article mentioned by Gayan Soyza should be what you need to do.

A speaker is easier to use then a piezo. The hardware as laid out in the ringtone page would work. Use a 47uF cap.

 

I have built that circuit and tried the programs on the site and can confirm that it works fine.

 

I managed to do this on an AVR and plays decent music (Square Wave) I shall post the programme soon... It is capable of playing 4 octaves...

__________________
Bharath Bhushan Lohray.
M.Sc. Electronics.

 

check out roman black's BTC algorithm. especially the 2 bit version with produces better sound. http://www.romanblack.com/btc_alg.htm

 

Or maybe this is more what you were looking for?
Generating sound

 

I don't especially know much about microcontrollers, but couldn't you generate a bit more of a sine wave-type sound using cap(s) and an D/A convertor? Juuust wondering.

EDIT: Just to clarify, I meant by using a D/A convertor to step the voltage up, then down and caps to antialias the wave.

 

yes, you could certainly use a DAC. The ideas that people are putting forth are about using one or 2 pins. A parallel DAC will take 8-10-12 pins while a serial DAC will take fewer pin but is a bit more complex to use. I would not use parallel with a uC but rather a serial one. However, I didn;'t get the sense you needed all that great quality.

Look at the Roman Black page - his algorithm actually produces fairly good sound quality with 2 output pins.

By the way, a DAC doesn't step the voltage up or down but rather you tell it what voltage level to output, thus tracking the waveform you are trying to reproduce.

 

Here is another link I searched when I was Researching.



http://www.qsl.net/yo5ofh/pic/tone_generator.htm
See if it's suits you.But I haven't try that.

__________________
Gayan

My Website
http://gsmicro.blogspot.com/

 

that's called an R-2R ladder and it is, in fact, a simple DAC. 8 bit, simple low pass filter.

it uses an RC oscillator for the clock so it will be pretty innacurate - better to use a real crystal.