I would like to connect 3.5 mm audio jack to nexys 3 board but have no idea how to do so.. I am a beginner with regards to fpgas and vhdl coding
Jack Born wrote: > I would like to connect 3.5 mm audio jack to nexys 3 board Why? For what reason? > but have no idea how to do so.. Fist step has absolutely nothing to do with FPGAs or VHDL: you must connect an AD converter to the FPGA. > I am a beginner with regards to fpgas and vhdl coding Then don't start with such a fairly demanding task (for a beginner). Instead start with the "blinking led", the "chasing light", and some RS232 and VGA, just to learn the very basics of hardware design. If you do not, you will crash...
Yes I was thinking of buying an ADC converter as the one shown. I know it sounds noobish but am not sure how to connect the audio jack's left and right channels to the respective data 1 and data 2 pins.
Jack Born wrote: > not sure how to connect the audio jack's left and right channels to the > respective data 1 and data 2 pins. Not at all. Read the documentation for the ADC module, then you will see that you have to connect the audio source to P1 and P3. Data1 and Data2 are the digital serial ADC outputs.
: Edited by Moderator
But how can a 3.5 mm jack be connected to 2 ports simultaneously?
Jack Born wrote: > But how can a 3.5 mm jack be connected to 2 ports simultaneously? It may be a stereo jack... http://en.wikipedia.org/wiki/Phone_connector_%28audio%29
yes but how do i connect the stereo jack with the adc converter shown in the picture?
Jack Born wrote: > yes but how do i connect the stereo jack with the adc converter shown in > the picture? Get a soldering iron and start. Maybe you must add a offset voltage to get the audio signal into mid range of the adc input:
The AD1 converts an analog input signal ranging from 0-3.3 volts to a 12-bit digital value in the range 0 to 4095.
So you will need something like this here:
o | 10k | In Left --||--o---- P1 of ADC 470n | 10k | GND In GND ---. | GND o 3V3 | 10k | In Right --||--o---- P3 of ADC 470n | 10k | GND
> with the adc converter shown in the picture Its an AD1 module from Digilent. Just WRITE down this little fact instead of digging in the mud for over 2 hours just to find out a little snippet of information...
actually thought i couldn't mention any brands, thanks I will dig around a bit and let u know how I got off
Maybe this could be a solution for you (ADC included...): http://uk.farnell.com/digilent/210-191/peripher-mod-stereo-jack-pmodi2s/dp/2061865
thats converting digital to analog not analog to digital :/
You should use an Audio Codec. I would use this one from MBed: http://docs-europe.electrocomponents.com/webdocs/10fc/0900766b810fcde6.pdf http://de.rs-online.com/web/p/entwicklungskits-prozessor-mikrocontroller/7541974/
The Nexys has 4 PMOD connectors. There are a number of audio IFs out to purchase in PMOD standard from Digilent.