Many cars have an "auxiliary input" in the radios. mine doesn't. I could replace the radio head with one that does, but that would cost money, and i'm cheap. In cars with a cassette tape slot, there are devices that relay the audio signal from a phone to the cassette reader head. My car doesn't have a cassette port either. That got me thinking.....how can i feed my phone audio into my car's stereo? there are short range FM transmitters, but those have crappy quality and im something of an audiophile (otherwise id just use the built in speaker on my phone while driving). So then i started thinking....since radio and cd are the only input sources it has, theres no way to do a cd hotwire, and the fm radio has pretty decent quality (with a strong professional broadcast antenna, not some $5 hunk of garbage)..... what if i unscrewed the antenna and plugged an arduino into it? there'd be no wireless to lose quality, and and it'd be cool as hell. does anyone know if this is even remotely possible to have an arduino transcode audio signals into FM radio signals that could be reliably relayed into the antenna port?
No. It's not possible.
why not? the antenna carries a signal, so does the arduino. why cant i just feed it the right signal? its basically a simplified fm portable transmitter
its basically a simplified fm portable transmitter
I think you overestimate arduino capability. The fm range 88-108, arduino has max 16 MHz. You 'd need at least two more external parts, multiplier by 6x (PLL ?) and FM modulator.
what about am? thats 531kHz to 1611kHz. i have no idea what the audio quality would be like, but if i use a shielded (say, coaxial) cable, then there should be minimal interference. also, it would be a much simpler project
You're back to making a "home broadcaster" again.
AM radio, at best, has a 10kHz bandwidth.
im not "broadcasting" anything. im sending signals straight into my car's antenna jack.
same difference
you're coupling RF directly to an antenna jack
same signal
soo....whats the problem? isnt that exactly what im trying to do?
What role has the arduino?
converting the audio signal into a radio signal of a given frequency
With AM there's a carrier frequency (RF) the amplitude of which is modulated by an intelligence (AF).
How does the Arduino work that, let alone better than would be by a "home broadcaster"?
Where do the "something of an audiophile", 10kHz bandwidth, and monophonic lines intersect?
they intersect at the point where i work minimum wage for a few hours a week if im lucky, radio stations suck, i like my music, and my 1/4 inch phone speaker sucks, and my car speakers kick ass. if it works, it works. if its crap, well then id know. the "home broadcasters" are susceptible to interference and are a joke. im not familiar with the AM protocol, but thats part of the fun of this project. the mega 2560 should have sufficient specs to handle it in real time. i once did camera tracking with it on a robot with only 92 bytes of ram to work with (the other 8100 were taken up by the image i was handling)
Obviously, as I'm sure you realize, I'm just a know-nothing hater-pig out to squelch Arduino dreams.
That's what they pay me for.
Well, all you have to do is work out the part between the input and the output, I guess - no big deal.
no no no thats not what i meant at all. i realize that there are devices out there for this/better ways to do this, but those arent feasible with my constraints. i understand that i'd have to push the arduino to its limits. if i was curt with you, its was because i was honest. not hateful, honest.
AM means Amplitude Modulation.
FM means Frequency Modulation.
In either case, you need some hardware that can function as a modulator.
The Arduino cant, as theres nothing in it that can perform this function.
hi,
Always go for the simple best way to achieve your goal. I suggest you to build a simple stereo FM transmitter and connect it to the phone and transmit it. Use a low power FM transmitter, you can get very cheap single chip FM transmitter, which will works well with a small number of discrete components outside the IC.