We are discussing on how to perform 3.3V to 5V level transformation for converting serial TTL to RS232 level from 3.3V you can use Potential3232 it functions at 3.3V levels.Remember that several USB to Serial converter will not help increased baud price.All ESP planks possess at minimum one serial port (furthermore known as a UART or USART): Serial.It is definitely used only when you initialize serial i.e.
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