# note GPIO0 and GPIO2 have built-in pull-ups on common ESP8266 # breakout boards making them suitable for I2C SDA and SCL D0 = 16 D1 = 5 D2 = 4 D3 = 0 D4 = 2 D5 = 14 D6 = 12 D7 = 13 D8 = 15 D9 = 3 D10 = 1 TX1 = D4 """Transmit pin from second (transmit-only) UART """ CLK = D5 """SPI clock pin""" MISO = D6 """SPI MISO (Master in, Slave out)""" MOSI = D7 """SPI MOSI (Master out, Slave in)""" RX0 = D9 TX0 = D10