1 from microcontroller import pin
16 """Transmit pin from second (transmit-only) UART """
21 """SPI MISO (Master in, Slave out)"""
23 """SPI MOSI (Master out, Slave in)"""
28 # GPIO0 and GPIO2 have built-in pull-ups on common ESP8266
29 # breakout boards making them suitable for I2C SDA and SCL