Making a 12 bit DAC Using an Arduino -- The Learning Circuit 96

The original project code can be found here: 

https://www.hackster.io/instrumentation-system/dac-8-bit-using-r-2r-ladder-964837

https://github.com/mfaliha/DAC-R-2R-Ladder-8-bit-Arduino-Uno

Follow along with Karen in the video to make the changes.

Where i can get code of it

let's call it poetic license :)

The DAC as per the episode title "Making a 12 bit DAC Using an Arduino" was 12bit and not limited by the ADC. 

The serial plotter (being used as an accessible alternative to an oscilloscope), was limited by the ADC in the Arduino to 10bit resolution.

However as the demo jumped from 8bit to 12bit, the 10bit resolution on the serial plotter was still sufficient to show a difference from the 8bit output.

exactly... the 12bit demo was in fact 10bit limited by the adc. 

The ADC doesn't care about what created the signal. In each instance, it's just sampling the signal at its input with 10bit resolution, which is then being plotted.

How did you read a 12bit dac output with the 10bit adc from the arduino uno?

Hello! I actually tried this project and had so much fun testing it. I managed modified your code a little, you can check it out on my github: https://github.com/HillaryatGitHub/Multiple-Bit-DAC. Again thank you so much for making such an in depth video

That's.....a really good point. I'm not really sure. I'd have to have someone that knows Arduino code better than I, take a look at the code and see if there's anything that is reducing the visual output. But yeah, you're right. It looks like there are fewer steps than the full resolution each time. Hmmmmm.

At 5:04 at the video, you adjust the code to 4 bit resolution of the DAC. However, at 5:20, there are only 4 voltage levels. That is where I would expect to see 16 voltage levels, as you described.

At 5:29 the code is adjusted to 6 bits, which should produce 64 different voltage level, however, I can only see 16.

Or maybe I got something wrong...