16 channel ADC for musical instrument
Huge Demux
Posts: 5
Hi!
I'm new to the forum, but have benn using BS2s for some years now,
I have worked with single channel adc before and it worked flawlessly, but now I want to have at least 12 analog inputs without using RCTIME (to make a musical instrument), so I bought the ADC0817 which is a 16-channel ADC multiplexer, and I'm having difficulties getting the values in (I get 255 or 0, no middle values)
·has anyone worked any external multiple channel ADC before?
If I can't get it to work, I'll try a 4067 (16 channel mux/demux) with a single channel ADC. Would that work?
Any tip or suggestion is appreciated!!
Thanks
Huge Demux
I'm new to the forum, but have benn using BS2s for some years now,
I have worked with single channel adc before and it worked flawlessly, but now I want to have at least 12 analog inputs without using RCTIME (to make a musical instrument), so I bought the ADC0817 which is a 16-channel ADC multiplexer, and I'm having difficulties getting the values in (I get 255 or 0, no middle values)
·has anyone worked any external multiple channel ADC before?
If I can't get it to work, I'll try a 4067 (16 channel mux/demux) with a single channel ADC. Would that work?
Any tip or suggestion is appreciated!!
Thanks
Huge Demux
Comments
Here is an Analog Devices 12 channel multiplexed ADC (link below) which may be better suited to your needs. It has a serial interface rather than the parallel interface on the ADC0817. The ADC0817 is more suited to a microcomputer with an existing parallel bus, rather than a microcontroller which usually uses serial protocals for control and data transfer. No sense making your life any more difficult or complicated than it needs to be. Besides, pin ports are a valuable resource on a microcontroller. It does appear you may need to use some additional control lines as well, beyond the serial interface however.
Here is the link:
http://www.analog.com/en/prod/0,2877,AD7265,00.html
There are dozens of others there as well. This was just the first one I saw that met at least the minimum criteria you mentioned.
Regards,
Bruce Bates
I didn't even know that my ADC0817 was parallel. So I understand that BS2's prefer serial communication. When I check your link and try to find the best adc for my project, I see that there are a lot of communication protocols available (listed under Output Data Format): Ser (i guess it is Serial), Byte, I2C, I2S, Ser 2-wire, Nibble, Par, SPI and LVDS. Does anyone know of a link that compares them all? Is the BS2 only serial compatible without external components?
Demux