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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Wilberforce
The pins are D0 to pin D39, so you want D12.
There are some tests in the Esp32 branch you can reference
https://github.com/espruino/Espruino/blob/ESP32/targets/esp32/tests/i2c-hd44780.js