Turn Your IPod Into A Universal Remote - Page 4 - Electronic Circuits Projects Diagrams Free

ecoy28 · 14th March 2007, 01:27 AM

will try to see what i can do. I'd like to ask more questions/guidance next time. si i cloud just use a dry cell(batt) and put it in series with the IR transmitter-Resistor combo. how bout the capacitor?

audioguru · 14th March 2007, 03:50 AM

An IR LED needs about 1.2V at about 15mA. A 3V battery and two 62 ohm resistors in series with the IR LED would produce 15mA. The audio from the headphones jack would feed through a 470uF capacitor to the junction of the two resistors. Then the IR LED would be AM modulated by the sound. The headphones output would have a 31 ohms load.

ecoy28 · 16th March 2007, 02:31 PM

muchas gracias, will try , will try.

would update you

ecoy28 · 30th March 2007, 12:53 AM

the receiver that i've made is connected to the printer port. the data it receives is not in audio( mp3, wav) how can i get the input from the remote via the microphone jack? in that way, the IR would be in audio format.

Sceadwian · 30th March 2007, 12:56 AM

Sample it using a 96khz capable audio card.

ecoy28 · 30th March 2007, 02:10 AM

what do you mean? i'm askin how i could input the ir through the microphone jack? what circuit could i use?

Sceadwian · 30th March 2007, 02:22 AM

Exactly what I said. Just feed the IR sensor output directly to the microphone jack, no circuit. The sound cards microphone pre-amp will amplify the signal sufficently for detection, even if it didn't most IR sensors should produce enough voltage to be detectable on a sound card with 16 bit samples.

ecoy28 · 30th March 2007, 02:30 AM

you mean, i won't even need a phototransistor? i'll just align the remote to the mic port and click?!

ecoy28 · 30th March 2007, 02:32 AM

it doesn't work

audioguru · 30th March 2007, 02:51 AM

A photo-diode is an IR sensor that will have a low level signal when it receives close-up IR radiated data.
But I doubt that a mic input can pickup 38kHz IR modulation. It probably cuts frequencies above 20kHz.

ecoy28 · 30th March 2007, 02:52 AM

what do i do? how can i sample the ir and save it in audio format

Sceadwian · 30th March 2007, 02:55 AM

I was thinking more along the lines of a photodiode directly connected to the MIC input.

ecoy28 · 30th March 2007, 02:58 AM

up to how much hertz can the mic input samp
le?

Sceadwian · 30th March 2007, 03:00 AM

Depends on your sound card, but most go up to 96khz, like I said though some of them have a 22khz low pass filter on the input regardless of the 96khz sampling rate (the increased sampling rate is for stereo seperation in the higher frequency ranges) On my card it appears that cut off frequency is pretty sharp, but you'd have to test it yourself. Worse case you're going to at least be able to see the modulation.

ecoy28 · 30th March 2007, 03:05 AM

i dohope i could get it workin. i think my audio card is integrated to my motherboard. tried to look up for it's sampling rate in the control panel. wasn't able to find it.

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14th March 2007, 01:27 AM	(permalink)
ecoy28	will try to see what i can do. I'd like to ask more questions/guidance next time. si i cloud just use a dry cell(batt) and put it in series with the IR transmitter-Resistor combo. how bout the capacitor?

14th March 2007, 03:50 AM	(permalink)
audioguru	An IR LED needs about 1.2V at about 15mA. A 3V battery and two 62 ohm resistors in series with the IR LED would produce 15mA. The audio from the headphones jack would feed through a 470uF capacitor to the junction of the two resistors. Then the IR LED would be AM modulated by the sound. The headphones output would have a 31 ohms load. __________________ Uncle $crooge

16th March 2007, 02:31 PM	(permalink)
ecoy28	muchas gracias, will try , will try. would update you

30th March 2007, 12:53 AM	(permalink)
ecoy28	receiver the receiver that i've made is connected to the printer port. the data it receives is not in audio( mp3, wav) how can i get the input from the remote via the microphone jack? in that way, the IR would be in audio format.

30th March 2007, 12:56 AM	(permalink)
Sceadwian	Sample it using a 96khz capable audio card. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har." Last edited by Sceadwian; 30th March 2007 at 12:59 AM.

30th March 2007, 02:10 AM	(permalink)
ecoy28	what do you mean? i'm askin how i could input the ir through the microphone jack? what circuit could i use?

30th March 2007, 02:22 AM	(permalink)
Sceadwian	Exactly what I said. Just feed the IR sensor output directly to the microphone jack, no circuit. The sound cards microphone pre-amp will amplify the signal sufficently for detection, even if it didn't most IR sensors should produce enough voltage to be detectable on a sound card with 16 bit samples. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

30th March 2007, 02:30 AM	(permalink)
ecoy28	no phototransistor? you mean, i won't even need a phototransistor? i'll just align the remote to the mic port and click?!

30th March 2007, 02:32 AM	(permalink)
ecoy28	it doesn't work

30th March 2007, 02:51 AM	(permalink)
audioguru	A photo-diode is an IR sensor that will have a low level signal when it receives close-up IR radiated data. But I doubt that a mic input can pickup 38kHz IR modulation. It probably cuts frequencies above 20kHz. __________________ Uncle $crooge

30th March 2007, 02:52 AM	(permalink)
ecoy28	what do i do? how can i sample the ir and save it in audio format

30th March 2007, 02:55 AM	(permalink)
Sceadwian	I was thinking more along the lines of a photodiode directly connected to the MIC input. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

30th March 2007, 02:58 AM	(permalink)
ecoy28	up to how much hertz can the mic input samp le?

30th March 2007, 03:00 AM	(permalink)
Sceadwian	Depends on your sound card, but most go up to 96khz, like I said though some of them have a 22khz low pass filter on the input regardless of the 96khz sampling rate (the increased sampling rate is for stereo seperation in the higher frequency ranges) On my card it appears that cut off frequency is pretty sharp, but you'd have to test it yourself. Worse case you're going to at least be able to see the modulation. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

30th March 2007, 03:05 AM	(permalink)
ecoy28	i dohope i could get it workin. i think my audio card is integrated to my motherboard. tried to look up for it's sampling rate in the control panel. wasn't able to find it.