Update index.md

index.md

@@ -12,4 +12,42 @@ title: "ESP32-S3 Uno Development Board"
 
 [Schematic](schematic.md)
 
-[Specifications](specs.md)
+[Specs](specs.md)
+
+## I2C Pins
+
+The provided schematic excerpt below shows the wiring of SDA and SCL; __SDA__ is wired to the _GPIO 8_ and __SCL__ is wired to the _GPIO 9_ on the ESP32-S3 Module.
+
+<img src="(assets/ESP32-Uno-Board-Module-Pinout.png" width="50%"/>
+
+The image of PCB board below shows the physical location of SDA and SCL terminals.
+<img "assets/ESP32-Uno-Board-GPIO.png" width="50%"/>
+
+### Micropython LED Blinky Code
+``` python
+import esp, esp32, time, os, _thread
+from machine import Pin, SoftI2C
+
+# An infinite loop thread to blink LED
+def status_led():
+    # Blink pattern blink-blink-pause
+    while True:
+        led.value(1)
+        time.sleep_ms(250)
+        led.value(0)
+        time.sleep_ms(250)
+        led.value(1)
+        time.sleep_ms(250)
+        led.value(0)
+        time.sleep_ms(750)
+
+# Display information about ESP32S3 module
+print(os.uname())
+print("Flash size: ", esp.flash_size()/1024/1024, "Mb")
+#rint("MCU Temperature: ", esp32.mcu_temperature(), "C")
+print("MCU Temperature: {:4.1f} C".format(esp32.mcu_temperature()))
+
+# Configure LED pin and start the blinky loop thread
+led = Pin(45, Pin.OUT)
+led.value(0)
+_thread.start_new_thread(status_led, ())