Last year I found some awesome Arduino pinout diagrams with full colour on the Arduino forums. They are all titled something like The Unofficial Arduino Pinout Diagram / The Definitive Arduino Pinout Diagram, etc. They disappeared from the Internet (pighixxx.com) in December 2013. With the help of the Internet Archive’s Wayback Machine I retrieved them. Fortunately they were distributed under a CC-BY-ND license, so here they are again in PDF’s for your download delectation.

Here’s an example bitmap version, but I recommend that you download, print and laminate the PDF version for your board.

• GY-271 Module has 5 pins. The application of them is as follows: VCC: Module power supply – 3 to 5 volts; GND: Ground SCL: I2C Clock pin SDA: I2C Data pin DRDY (DataReady): When the output value of the sensor is ready, an interrupt occurs in this pin.This pin is pulled up inside the module by default. When the output value of the module is ready, the pin is “0” for 250 microseconds.
• How to use the photo resistor sensor module from the 37 in 1 sensor kit for Arduino from Geekcreit, Elegoo, Elektor and others. In some kits the module may be called an LDR (Light Dependent Resistor), photocell, or be written 'photoresistor'. This tutorial shows the basic use and testing of the photo resistor sensor module with Arduino.
• Let’s see the pinout of this 4 digit 7 segment display. Pin Out – 4 Digit 7 Segment Display A 4-digit 7-segment LED display has 12 pins. 8 of the pins are for the 8 LEDs on each of the 7 segment displays, which includes A-G and DP (decimal point).

ELEGOO Arduino Nano Board V3.0+/V3.0 CH340 USB Driver. Click to download: Nano 3.0+ Nano 3.0. Related Articles. ELEGOO Smart Robot Car Kit. Unboxing the Elegoo Nano 3 pack.

Sorry, I couldn’t find any more PDF’s on the Internet Archive to host here.

Arduino Nano Spi Pinout

Thanks, Alberto! Alberto’s writing a book, Arduino Basic Connections, but it hasn’t materialised yet, even though he’s raised quite a considerable amount of $$$. According to a tweet from him in May 2014, he’s been ill, so get well soon! It looks like it’s going to be awesomely handy, stuffed with all these pinout diagrams as well as ‘cookbook’ circuits with the same awesome graphic and detail quality and ring-bound. Fingers crossed…

Elegoo Nano Datasheet

Here are some other great books you might be interested in:

Elegoo Nano Pinout Chart

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Elegoo Nano Pinout Kit

Bootnote: Reader Nidal Ayari asked me to include a link to his Eagle files for Arduino Pro Mini. I haven’t even looked at them since I Don’t Do Windows (and so my PCB layout tool of choice is KiCad but I assume they’re good ;-).