Hello,
Are there other boards than the Due (including clones of Arduino or non-Arduino boards) which do have 12-bits ADCs ? I don't need much processing power, I just want four such ADCs (and possibly eight PWM outputs to drive small LEDs too).
Thank you in advance.
What do you need 12 bits for? If you have a reasonable source, you can easily increase the default resolution to 12 bits by oversampling and decimating the result. Of course you have to have time to take the extra samples. I believe you'd only need to take 16 samples to obtain the extra 2 bits of resolution. You just sum up 16 samples and then right shift the sum by 2 bits to increase resolution by 2 bits.
I believe the teensy 3.0 chip has 13 usable bits of analog input (it defaults to 10 bits):
If you need access to the secondary pins in a breadboard setup, there are two adapter kits that bring out the additional pins:
I bought two Teensy 3.0's during the initial kickstarter campaign.
You may try leaflabs.com - two 12-bit ADC. There "clones" from Olimexino 30$ or so.
Declaimer: I'm not affiliated with any of mention company
Thanks for the information.
@afremont: Oversampling... ...nice idea. With four sensors, how would you proceed on an Uno board: one global for loop repeated 16 times and scanning the four sensors one after the other, or a sequence of four distinct for loops with 16 iterations each ?
Here is Atmel's take on it, there are many others out there too. It's going to depend upon how your noise is spread out. You may want to try both ways and see if you notice any difference.