MCP4261 dual digital potentiometer

   I have an MCP4261-503E/P dual digital potentiometer hwo can control via SPI interface in 256 steps (0 to 255 - 8 bits).

   I use info find in article Arduino - Using digital potentiometers part 2 (MCP4251) from Matthew McMillan's blog.
   My digital potentiometer is in THT/PDIP capsule:

   After info from Mattew's sketch I made my test schematic:

and after made some changes, I upload MCP4261_mega_lcd1602_i2c_test.ino sketch.

   For tests, I have some particular cases:

- both on minimum 

- first potentiomer at minimum and second at maximum:

- first potentimeter at maximum and second at minumum value:

- both at maximum:

and after that I put to change steps from 0 to 255 to see the difference between potentiometers:

   I put on net 2 movies:

-  MCP4261 digital dual potentiometer with Arduino Mega:

- MCP4261 digital dual potentiometer with Arduino Mega (2)