I bought three Monochrome 128x32 OLED displays but was surprised that each had a bad pixel. The bad pixel is in a different spot on each display. Is this normal?
I love the display and wrote a character only library to eliminate the 512 byte RAM buffer. This library also allows both bit-bang and hardware SPI so it works well with the Data Logging shield.
Here is an example data logger with an 18-bit MCP3422 differential delta-sigma ADC and the 128x32 display.
At max gain the LSB of the MCP3422 is about two micro-volts so it can log voltages a thousand times smaller than the Arduino ADC.