Uses teensy 4.0 and a sparkfun Micro OLED Breakout.
Capacitor is 10uf to 1000uf Both resistors are of the same value and 1k to 10k. tweek values to your liking. seems good with 10k resistors and 220uf capacitor.
note: there is a noticable offset when resistors are too large in value. i think this is caused by some internal bias in the chip.