| Electronics > Projects, Designs, and Technical Stuff |
| quick questions about DAC on arduino and psu's |
| << < (3/3) |
| Ian.M:
Check out the specs of the internal reference (Datasheet section 32.8. ADC Characteristics). Its min. 1.0V typ. 1.1V max. 1.1V, which is +/- 0.1V or 9%. Unless the ATmega328P's 5V supply is worse than that (+/-0.45V), or has a significant time-varying load on it you are better off using the Arduino default 5V supply as reference. If you use the internal reference, you will have to calibrate, and the datasheet has no data on its temperature stability. Also, its only a 10 bit ADC, which is barely good enough for a three digit meter. If you want to do better you'll need an external 16 bit or better ADC, a precision reference IC and very good design and board layout skills to give the ADC and reference a clean enough supply and avoid digital noise polluting the analog ground so the ADC LSBs are actually worth something for other uses than as a random number seed. |
| iMo:
For example: Btw, you may get a good advice on the arduino forum too.. |
| Nusa:
--- Quote from: Kilroywashere on March 24, 2019, 02:32:54 am ---Not my design and was not building this ... I was intrested in how he was hooking up his arduino and lcd --- End quote --- Nothing magic about the LCD setup. Here's one of the many writeups on it: https://www.arduino.cc/en/Tutorial/HelloWorld It's the same interface for all the very common HD44780 LCD displays, whether they're 1x16 or 4x20. And if you want to understand the controller chip: https://www.sparkfun.com/datasheets/LCD/HD44780.pdf |
| Navigation |
| Message Index |
| Previous page |