1 Dec
2008
1 Dec
'08
5:41 p.m.
Hi Tim
interesting thread as i am working on a
control-surface myself atm ... i
would be curious, if someone has some experience with higher-precision
adc? most io boards i know (arduino/makingthings) provide 10-bit adcs,
while i'd be interested in getting a higher resolution ... does anyone
have experience with interfacing a microcontroller (e.g. arduino) with an
external high-resolution adc?
For regular 7-bit stuff, I'll be using a 16-input, 8-bit ADC. However,
in order to get higher resolutions for the 2 x 7-bit messages, I am
dropping analogue input in favour of rotary encoders.
The encoders that I will be using (currently on their way from China)
output a 2-bit Gray code, meaning that I can read 4 of them
simultaneously using a single port. (I'll actually be using 8 in a 4 x
2 matrix, scanning them just like a keypad.) $16 USD for 10 - quite a
lot cheaper than pots!
If your input has to be analogue, ADCs are available with many different
interfaces - synchronous serial (like the TI ones I'll be using), SPI,
I2C and byte-wide, which can be accessed like external memory.
Cheers
M
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
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