Add PiCowbell CircuitPython I2C scan.

PiCowbell_Proto/i2c_scan/code.py

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2022 Kattni Rembor for Adafruit Industries
+# SPDX-License-Identifier: MIT
+"""CircuitPython I2C Device Address Scan for PiCowbell Proto and Pico"""
+import time
+import board
+
+i2c = board.STEMMA_I2C()
+
+while not i2c.try_lock():
+    pass
+
+try:
+    while True:
+        print(
+            "I2C addresses found:",
+            [hex(device_address) for device_address in i2c.scan()],
+        )
+        time.sleep(2)
+
+finally:  # unlock the i2c bus when ctrl-c'ing out of the loop
+    i2c.unlock()