So I'm attempting to ramp and LED from a 8-bit MCP4901 Digital-to-Analog IC. I have it running between 0-5 V with .06 V intervals. I am then reading the voltage right before the device and having it print to the serial window. I am able to achieve a ramped out. I am not trying to control brightness, simply apply voltage and measure the current.
The problem i'm seeing is that depending on device/component I plug in, my voltage will cap off well before ever reaching 5V. I'm wondering why this is happening and what I might do to negate this problem. Could this be a problem with the current coming from the DAC?
Thank you in advance.