An organic light-emitting diode OLED is a light-emitting diode LED in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes typically and at least one of these electrodes is transparent. Sparkfun have the breakout board for this display, its easy and time saving to use the same breakout for any projects. This breakout board operates at 3. The breakout board is an open source design and you can get the design files here.
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The following figure illustrates the ESP E chip pinout. At the moment, there are a wide variety of development boards with the ESP chip that differ in the number of accessible GPIOs, size, form factor, etc…. The following table shows the correspondence between the labels on the silkscreen and the GPIO number as well as what pins are the best to use in your projects, and which ones you need to be cautious. The pins highlighted in green are OK to use. The ones highlighted in yellow are OK to use, but you need to pay attention because they may have unexpected behavior mainly at boot.