used Arduino UNO.

 

Do you have a URL for the exact DAC ?

MPC42xx ? <<< two x's or three x's ?
MCP42xxx ?
How about an MCP42010 ?

https://www.microchip.com/wwwproducts/en/MCP42010
http://ww1.microchip.com/downloads/en/DeviceDoc/11195c.pdf

The MPC42010 appears to be a Dual Digital Potentiometer with SPI interface.

 

Do you have a URL for the exact DAC ?

MPC42xx ? <<< two x's or three x's ?
MCP42xxx ?
How about an MCP42010 ?

https://www.microchip.com/wwwproducts/en/MCP42010
http://ww1.microchip.com/downloads/en/DeviceDoc/11195c.pdf

The MPC42010 appears to be a Dual Digital Potentiometer with SPI interface.

Thank you mvas, want to use MCP4261.

 

You know you can use a PWM in Arduino to make a DAC ? It needs
external RC LPF to convert pulse to DC, so there is settling time needed
by LPF to reach final value after a change. Its accuracy primarily controlled
by accuracy of Arduino power supply V.

https://www.hackster.io/Arduino_Scuola/build-a-simple-dac-for-your-arduino-4c00bd


Regards, Dana.

 

Thank you mvas, want to use MCP4261.

This device is controlled via SPI. If you are using an Arduino, you’re in luck. There is an Arduino library to control this chip (click on “library” to be taken to the download page. You’ll also need the Arduino SPI library.

Check out the documentation in the link. It’ll describe what you need to do.

 

Thank you mvas, want to use MCP4261.

The MPC4261 is also Digital Potentiometer.

Did you try using the Arduino Library that was specifically designed for the MCP4261 device ?
https://playground.arduino.cc/code/mcp4261

 

The MPC4261 is also Digital Potentiometer.

Did you try using the Arduino Library that was specifically designed for the MCP42xx devices ?
https://playground.arduino.cc/code/mcp4261

That’s the same link in my post.

 

Thank you Participants.
Any idea how to figure out the difference between two sketches? say I have sketch_a and sketch_b, and the the latter is modified from former somehow a little, how can easily find out where the modifications are?