--- /dev/null
+from microcontroller import pin
+
+D0 = pin.GPIO16
+D1 = pin.GPIO5
+D2 = pin.GPIO4
+D3 = pin.GPIO0
+D4 = pin.GPIO2
+D5 = pin.GPIO14
+D6 = pin.GPIO12
+D7 = pin.GPIO13
+D8 = pin.GPIO15
+D9 = pin.GPIO3
+D10 = pin.GPIO1
+
+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
+
+# GPIO0 and GPIO2 have built-in pull-ups on common ESP8266
+# breakout boards making them suitable for I2C SDA and SCL