Updated I2C code, added I2C test script

CircuitPython_Essentials/CircuitPython_I2C.py

@@ -1,25 +1,25 @@
-# I2C sensor demo
+# CircuitPython Demo - I2C sensor
 
 import board
 import busio
-import adafruit_si7021
+import adafruit_tsl2561
 import time
 
 i2c = busio.I2C(board.SCL, board.SDA)
 
-# lock the I2C device before we try to scan
+# Lock the I2C device before we try to scan
 while not i2c.try_lock():
     pass
-print("I2C addresses found:", [hex(i) for i in i2c.scan()])
+# Print the addresses found once
+print("I2C addresses found:", [hex(device_address) for device_address in i2c.scan()])
 
-# unlock I2C now that we're done scanning.
+# Unlock I2C now that we're done scanning.
 i2c.unlock()
 
 # Create library object on our I2C port
-si7021 = adafruit_si7021.SI7021(i2c)
+tsl2561 = adafruit_tsl2561.TSL2561(i2c)
 
-
-# Use library to read the data!
+# Use the object to print the sensor readings
 while True:
-    print("Temp: %0.2F *C   Humidity: %0.1F %%" % (si7021.temperature, si7021.relative_humidity))
-    time.sleep(1)
+    print("Lux:", tsl2561.lux)
+    time.sleep(1.0)

CircuitPython_Essentials/I2C_Test_Script.py

@@ -0,0 +1,38 @@
+import board
+import busio
+
+
+def is_hardware_I2C(scl, sda):
+    try:
+        p = busio.I2C(scl, sda)
+        p.deinit()
+        return True
+    except ValueError:
+        return False
+
+
+def get_unique_pins():
+    pin_names = dir(board)
+    if "NEOPIXEL" in pin_names:
+        pin_names.remove("NEOPIXEL")
+    if "APA102_MOSI" in pin_names:
+        pin_names.remove("APA102_MOSI")
+    if "APA102_SCK" in pin_names:
+        pin_names.remove("APA102_SCK")
+    pins = [getattr(board, p) for p in pin_names]
+    unique = []
+    for p in pins:
+        if p not in unique:
+            unique.append(p)
+    return unique
+
+
+for scl_pin in get_unique_pins():
+    for sda_pin in get_unique_pins():
+        if scl_pin is sda_pin:
+            continue
+        else:
+            if is_hardware_I2C(scl_pin, sda_pin):
+                print("SCL pin:", scl_pin, "\t SDA pin:", sda_pin)
+            else:
+                pass