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Add current limiting resistors for LEDs to circuit description comments
I followed the existing precedent set in the "WhileStatementConditional" example for the text. 220 ohm is the value used in the tutorials for the examples, as well as being what is provided in the Starter Kit.
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Diff for: ‎examples/02.Digital/Button/Button.ino

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when pressing a pushbutton attached to pin 2.
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The circuit:
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- LED attached from pin 13 to ground
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- LED attached from pin 13 to ground through 220 ohm resistor
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- pushbutton attached to pin 2 from +5V
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- 10K resistor attached to pin 2 from ground
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Diff for: ‎examples/02.Digital/Debounce/Debounce.ino

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minimum delay between toggles to debounce the circuit (i.e. to ignore noise).
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The circuit:
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- LED attached from pin 13 to ground
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- LED attached from pin 13 to ground through 220 ohm resistor
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- pushbutton attached from pin 2 to +5V
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- 10 kilohm resistor attached from pin 2 to ground
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Diff for: ‎examples/02.Digital/StateChangeDetection/StateChangeDetection.ino

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The circuit:
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- pushbutton attached to pin 2 from +5V
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- 10 kilohm resistor attached to pin 2 from ground
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- LED attached from pin 13 to ground (or use the built-in LED on most
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Arduino boards)
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- LED attached from pin 13 to ground through 220 ohm resistor (or use the
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built-in LED on most Arduino boards)
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created 27 Sep 2005
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modified 30 Aug 2011

Diff for: ‎examples/03.Analog/AnalogInOutSerial/AnalogInOutSerial.ino

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- potentiometer connected to analog pin 0.
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Center pin of the potentiometer goes to the analog pin.
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side pins of the potentiometer go to +5V and ground
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- LED connected from digital pin 9 to ground
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- LED connected from digital pin 9 to ground through 220 ohm resistor
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created 29 Dec. 2008
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modified 9 Apr 2012

Diff for: ‎examples/03.Analog/AnalogInput/AnalogInput.ino

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one side pin (either one) to ground
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the other side pin to +5V
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- LED
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anode (long leg) attached to digital output 13
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anode (long leg) attached to digital output 13 through 220 ohm resistor
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cathode (short leg) attached to ground
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- Note: because most Arduinos have a built-in LED attached to pin 13 on the

Diff for: ‎examples/03.Analog/Calibration/Calibration.ino

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The circuit:
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- analog sensor (potentiometer will do) attached to analog input 0
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- LED attached from digital pin 9 to ground
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- LED attached from digital pin 9 to ground through 220 ohm resistor
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created 29 Oct 2008
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by David A Mellis

Diff for: ‎examples/03.Analog/Fading/Fading.ino

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This example shows how to fade an LED using the analogWrite() function.
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The circuit:
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- LED attached from digital pin 9 to ground.
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- LED attached from digital pin 9 to ground through 220 ohm resistor.
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created 1 Nov 2008
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by David A. Mellis

Diff for: ‎examples/04.Communication/Dimmer/Dimmer.ino

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set the brightness of the LED.
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The circuit:
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- LED attached from digital pin 9 to ground.
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- LED attached from digital pin 9 to ground through 220 ohm resistor.
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- Serial connection to Processing, Max/MSP, or another serial application
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created 2006

Diff for: ‎examples/04.Communication/PhysicalPixel/PhysicalPixel.ino

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Processing (see code below), Flash (via a serial-net proxy), PD, or Max/MSP.
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The circuit:
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- LED connected from digital pin 13 to ground
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- LED connected from digital pin 13 to ground through 220 ohm resistor
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created 2006
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by David A. Mellis

Diff for: ‎examples/04.Communication/ReadASCIIString/ReadASCIIString.ino

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It parses them into ints, and uses those to fade an RGB LED.
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Circuit: Common-Cathode RGB LED wired like so:
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- red anode: digital pin 3
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- green anode: digital pin 5
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- blue anode: digital pin 6
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- red anode: digital pin 3 through 220 ohm resistor
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- green anode: digital pin 5 through 220 ohm resistor
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- blue anode: digital pin 6 through 220 ohm resistor
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- cathode: GND
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created 13 Apr 2012

Diff for: ‎examples/05.Control/IfStatementConditional/IfStatementConditional.ino

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- potentiometer
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Center pin of the potentiometer goes to analog pin 0.
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Side pins of the potentiometer go to +5V and ground.
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- LED connected from digital pin 13 to ground
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- LED connected from digital pin 13 to ground through 220 ohm resistor
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- Note: On most Arduino boards, there is already an LED on the board connected
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to pin 13, so you don't need any extra components for this example.

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