pybricks.iodevices: Document pinout.

doc/main/iodevices/analogsensor.rst

@@ -1,6 +1,6 @@
 .. pybricks-requirements:: pybricks-iodevices ev3
 
-EV3 Analog Sensor
+Analog Sensor
 ^^^^^^^^^^^^^^^^^
 
 .. figure:: ../../main/cad/output/iodevice-rj12brown.png

doc/main/iodevices/dcmotor.rst

@@ -1,4 +1,4 @@
-EV3 DC Motor
+DC Motor
 ^^^^^^^^^^^^^^^^^^
 
 .. note::

doc/main/iodevices/i2cdevice.rst

@@ -1,6 +1,9 @@
 Generic I2C Device
 ^^^^^^^^^^^^^^^^^^
 
+EV3 and NXT support connecting generic I2C devices to the hub.
+See :doc:`pinout here <uartdevice>`.
+
 .. figure:: ../../main/cad/output/iodevice-rj12cyan.png
    :width: 25 %
 

doc/main/iodevices/uartdevice.rst

@@ -3,13 +3,45 @@
 Generic UART Device
 ^^^^^^^^^^^^^^^^^^^
 
-.. |uart-wired| image:: ../../main/cad/output/iodevice-rj12grey.png
-   :width: 20 %
+Powered Up and EV3 support connecting generic UART devices to the hub. The pinout
+is shown below. Note the orientation of the connector. For EV3, the internal
+wire colors match those on the diagram below.
 
-.. |uart-wireless| image:: ../../main/cad/output/iodevice-pupdevice.png
+.. image:: pinout_numbered.jpg
    :width: 50 %
 
-|uart-wired| |uart-wireless|
+.. list-table::
+   :header-rows: 1
+
+   * - Pin
+     - Powered Up (UART)
+     - EV3 (UART sensor)
+     - EV3 (I2C sensor)
+   * - 1 (white)
+     - Motor Terminal 1
+     - Optional battery power
+     - Optional battery power
+   * - 2 (black)
+     - Motor Terminal 2
+     - N/A
+     - N/A
+   * - 3 (red)
+     - Ground
+     - Ground
+     - Ground
+   * - 4 (green)
+     - VCC (3.3 V)
+     - VCC (5 V)
+     - VCC (5 V)
+   * - 5 (yellow)
+     - Hub TX (Sensor RX) (3.3 V)
+     - Hub TX (Sensor RX) (3.3 V)
+     - SCL (master) (3.3 V)
+   * - 6 (blue)
+     - Hub RX (Sensor TX) (3.3 V)
+     - Hub RX (Sensor TX) (3.3 V)
+     - SDA (master) (3.3 V)
+
 
 .. autoclass:: pybricks.iodevices.UARTDevice
 

src/pybricks/iodevices.py

@@ -181,7 +181,12 @@ class AnalogSensor:
 
 
 class I2CDevice:
-    """Generic or custom I2C device."""
+    """Generic or custom I2C device.
+
+    Note: Use the ``power_pin`` option at your own risk. Applying power to the
+    pins can damage your hub or device if you are not careful. When you use
+    this option, you will be prompted to confirm that you understand the risks.
+    """
 
     def __init__(
         self,
@@ -259,7 +264,12 @@ class I2CDevice:
 
 
 class UARTDevice:
-    """Generic UART device."""
+    """Generic UART device.
+
+    Note: Use the ``power_pin`` option at your own risk. Applying power to the
+    pins can damage your hub or device if you are not careful. When you use
+    this option, you will be prompted to confirm that you understand the risks.
+    """
 
     def __init__(
         self,