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Commit c8fae22

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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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‎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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‎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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‎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

‎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

‎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

‎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

‎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

‎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

‎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

‎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

‎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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