AD8403 digital pot programming

Forum 2005-2010 (read only) Hardware Interfacing
1

I am trying to program an AD8403 digital pot using this http://www.arduino.cc/en/Tutorial/SPIDigitalPot as a basis. I have changed the SPI pin values and connected it to my Mega according to the guide + ad8403 pin diagram. The wipers seem to always output ~4.5v given 5v input (they should fade from 5-0). Right now I am trying to figure out how to adapt the guide to the 8402 but my main goal is have two input values 0-5v be replicated using the pot. I realize the pot in the example is a 6 channel and the 8403 is a 4 channel so I changed the values accordingly but It still only outputs 4.5v. I wish I could have just purchased a AD5206 to begin with but I cannot find a distributor (that I can purchase less than 15 at once from) :-/

2

I have changed the SPI pin values

SPI pins are fixed in hardware.

I wish I could have just purchased a AD5206 to begin with but I cannot find a distributor

Try:-

3

"Product 1464303 needs to be ordered in multiples of 186. We have altered your quantity from 1 to 186" The least I could buy directly from Analog Devices was 15..

4

I meant the pin values in the program:

#define DATAOUT 51//MOSI
#define DATAIN 50//MISO - not used, but part of builtin SPI
#define SPICLOCK 52//sck
#define SLAVESELECT 53//ss

5

bump. anywhere else to buy?