record sounds and play them with a pic? - Electronic Circuits Projects Diagrams Free

mashersmasher · 11th May 2008, 02:20 PM

is it possible to record small sounds like voice responses and play them from a pic? if so how would i record them and download them to the pic? i don't know how to use external memory but if that's what i would need i have often wondered how it is used.

bananasiong · 11th May 2008, 02:34 PM

Hi,
Is that for speech frequency? Record for how long?
Use ADC and PWM module of the microcontroller. Don't forget the anti aliasing filter.

HarveyH42 · 11th May 2008, 02:58 PM

http://www.allelectronics.com/cgi-bi...RECORDER_.html

For $2.00, you get 30 seconds pretty cheap and easy. Have 10 of them, but haven't had time to do much more then take one a part. Pretty good value just for parts. The batteries included are fresh, 1" speaker plastic coil, electret mike, two pushbuttons. The figure is held on with two screws, easy to remove. The base makes a nice project case with battery holder built in. Plenty of room for a PCB slightly smaller the 2" square.

mashersmasher · 11th May 2008, 04:24 PM

Quote:

Originally Posted by bananasiong

Hi,
Is that for speech frequency? Record for how long?
Use ADC and PWM module of the microcontroller. Don't forget the anti aliasing filter.

uh.. thanks. i don't know what any of that is especially anti aliasing but i will look it up!

Quote:

Originally Posted by HarveyH42

http://www.allelectronics.com/cgi-bi...RECORDER_.html

For $2.00, you get 30 seconds pretty cheap and easy. Have 10 of them, but haven't had time to do much more then take one a part. Pretty good value just for parts. The batteries included are fresh, 1" speaker plastic coil, electret mike, two pushbuttons. The figure is held on with two screws, easy to remove. The base makes a nice project case with battery holder built in. Plenty of room for a PCB slightly smaller the 2" square.

that would be alright but i want to have maybe 5 or 6 commands maybe 2 to 3 seconds each. thanks though

Salgat · 11th May 2008, 05:49 PM

Use the ADC on your PIC to record the voltage present at your microphone/speaker at a rate of twice the highest frequency you wish to record, and to play back the sounds simply send the values you recorded to a PORT at the same rate that you recorded the sound. The PORT will use an R2R network as a DAC.

If you wish to use sounds from your computer, simply convert your sound file to an 8-Bit Mono PCM wav format and convert it to HEX (Microsoft Windows comes with a sound recorder that saves to this format). Take the HEX version, remove the header, and set it as an array in your program.

AtomSoft · 26th June 2008, 02:49 PM

Quote:

Originally Posted by Salgat

Use the ADC on your PIC to record the voltage present at your microphone/speaker at a rate of twice the highest frequency you wish to record, and to play back the sounds simply send the values you recorded to a PORT at the same rate that you recorded the sound. The PORT will use an R2R network as a DAC.

If you wish to use sounds from your computer, simply convert your sound file to an 8-Bit Mono PCM wav format and convert it to HEX (Microsoft Windows comes with a sound recorder that saves to this format). Take the HEX version, remove the header, and set it as an array in your program.

Bringing this back to life

How would one remove the header? Also if i dont use it the PC Way what would be the best way to save the recorded data on the chip ? eeprom ?

**Nigel Goodwin** · 26th June 2008, 02:56 PM

EPE did just such a project a few years back, they used an EEPROM to store the HEX data from the WAV file, and provided a PC program that transferred it via RS232, and presumably removed the header. WAV is a dead simple format, it should be trivial to remove the header.

AtomSoft · 26th June 2008, 03:17 PM

ok found out header ends at Address 0x39 in the file. Was simple to find it. Made a empty wav hexed it and found it clean only header so removed it from other one and copied out all the hex values into a text file so i guess i have to send these hex values from my program to a eeprom? I need to buy one since it is around 500KB.

Can someone recommend some eeproms? Also anywhere i can get samples?

**Nigel Goodwin** · 26th June 2008, 04:01 PM

Quote:

Originally Posted by AtomSoft

ok found out header ends at Address 0x39 in the file. Was simple to find it. Made a empty wav hexed it and found it clean only header so removed it from other one and copied out all the hex values into a text file so i guess i have to send these hex values from my program to a eeprom? I need to buy one since it is around 500KB.

Told you the header was easy!

If that's kiloBYTES and not kiloBITS then you should perhaps be looking at an SD card instead, the EPE example I mentioned used a 512kiloBIT EEPROM. I don't think you get them at 4megabit?.

AtomSoft · 26th June 2008, 04:33 PM

wow now i have to learn about sd cards lol ok so any links and/or tutorials i can read up on?

futz · 26th June 2008, 05:48 PM

Quote:

Originally Posted by AtomSoft

wow now i have to learn about sd cards lol ok so any links and/or tutorials i can read up on?

Read the third post down in this thread.

philba · 26th June 2008, 08:29 PM

Here is a really easy way to do audio from a PIC. No need for a DAC - just a low pass filter (cap and resistor). It sounds like exactly what you need.

Official Home Page of the Roman Black

AtomSoft · 27th June 2008, 01:50 AM

futz what uC do you recommend? i see your trying the 18F4620. Is there anything else ?

I have on hand a PIC18F448 and a PIC18F248. Would any of those do? I will buy from Futurlec those parts it seems like a nice challenge to work on.

futz · 27th June 2008, 02:25 AM

Quote:

Originally Posted by AtomSoft

futz what uC do you recommend? i see your trying the 18F4620. Is there anything else ?

I have on hand a PIC18F448 and a PIC18F248. Would any of those do? I will buy from Futurlec those parts it seems like a nice challenge to work on.

Either of those will work fine. It doesn't need anything special. Just SPI, so a MSSP module. The 18F4620 is overkill. I'm using 3 pins on it.

Like most projects, I used it because I had one and hadn't really done anything with it yet.

AtomSoft · 27th June 2008, 11:27 AM

Ill use the 248 as the 448 seems like it would be a waste also...

Now to order the other parts and read a lot!

11th May 2008, 02:20 PM	(permalink)
mashersmasher Experienced Member	record sounds and play them with a pic? is it possible to record small sounds like voice responses and play them from a pic? if so how would i record them and download them to the pic? i don't know how to use external memory but if that's what i would need i have often wondered how it is used.

11th May 2008, 02:34 PM	(permalink)
bananasiong Experienced Member	Hi, Is that for speech frequency? Record for how long? Use ADC and PWM module of the microcontroller. Don't forget the anti aliasing filter. __________________ Superman Returns.. http://www.supermanhomepage.com/imag...an-returns.gif My friend created this account for me.. LOL http://bananasiong.myminicity.com oh.. somemore http://bananasiong.myminicity.com/env

11th May 2008, 05:49 PM	(permalink)
Salgat Experienced Member	Use the ADC on your PIC to record the voltage present at your microphone/speaker at a rate of twice the highest frequency you wish to record, and to play back the sounds simply send the values you recorded to a PORT at the same rate that you recorded the sound. The PORT will use an R2R network as a DAC. If you wish to use sounds from your computer, simply convert your sound file to an 8-Bit Mono PCM wav format and convert it to HEX (Microsoft Windows comes with a sound recorder that saves to this format). Take the HEX version, remove the header, and set it as an array in your program. __________________ salgat.blogspot.com Last edited by Salgat; 11th May 2008 at 05:52 PM.

26th June 2008, 02:56 PM	(permalink)
Nigel Goodwin Super Moderator	EPE did just such a project a few years back, they used an EEPROM to store the HEX data from the WAV file, and provided a PC program that transferred it via RS232, and presumably removed the header. WAV is a dead simple format, it should be trivial to remove the header. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

26th June 2008, 03:17 PM	(permalink)
AtomSoft Experienced Member	ok found out header ends at Address 0x39 in the file. Was simple to find it. Made a empty wav hexed it and found it clean only header so removed it from other one and copied out all the hex values into a text file so i guess i have to send these hex values from my program to a eeprom? I need to buy one since it is around 500KB. Can someone recommend some eeproms? Also anywhere i can get samples? __________________ My YouTube Videos! AtomSoft Projects Last edited by AtomSoft; 26th June 2008 at 03:20 PM.

11th May 2008, 02:58 PM	(permalink)
HarveyH42 Experienced Member	http://www.allelectronics.com/cgi-bi...RECORDER_.html For $2.00, you get 30 seconds pretty cheap and easy. Have 10 of them, but haven't had time to do much more then take one a part. Pretty good value just for parts. The batteries included are fresh, 1" speaker plastic coil, electret mike, two pushbuttons. The figure is held on with two screws, easy to remove. The base makes a nice project case with battery holder built in. Plenty of room for a PCB slightly smaller the 2" square.

26th June 2008, 04:33 PM	(permalink)
AtomSoft Experienced Member	wow now i have to learn about sd cards lol ok so any links and/or tutorials i can read up on? __________________ My YouTube Videos! AtomSoft Projects

26th June 2008, 08:29 PM	(permalink)
philba Experienced Member	Here is a really easy way to do audio from a PIC. No need for a DAC - just a low pass filter (cap and resistor). It sounds like exactly what you need. Official Home Page of the Roman Black

27th June 2008, 01:50 AM	(permalink)
AtomSoft Experienced Member	futz what uC do you recommend? i see your trying the 18F4620. Is there anything else ? I have on hand a PIC18F448 and a PIC18F248. Would any of those do? I will buy from Futurlec those parts it seems like a nice challenge to work on. __________________ My YouTube Videos! AtomSoft Projects

27th June 2008, 11:27 AM	(permalink)
AtomSoft Experienced Member	Ill use the 248 as the 448 seems like it would be a waste also... Now to order the other parts and read a lot! __________________ My YouTube Videos! AtomSoft Projects

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