From a6de2663d174ee0ea312596dbf1b22cc02d712e6 Mon Sep 17 00:00:00 2001
From: Oliver Rafelsberger <19696982+Palmstroemen@users.noreply.github.com>
Date: Tue, 15 Dec 2020 20:46:20 +0100
Subject: [PATCH 1/3] Added some comment lines for pins used.

Took me some time to figure out that the pins differ from board to board. Comments would help.
---
 examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino b/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
index 812bac0b..e0e13c93 100644
--- a/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
+++ b/examples/ssd1306_128x64_i2c/ssd1306_128x64_i2c.ino
@@ -27,6 +27,10 @@
 #define SCREEN_HEIGHT 64 // OLED display height, in pixels
 
 // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+// The pins for I2C are fixed and defined by the Wire-library. 
+// On an arduino UNO it's: A4(SDA), A5(SCL)
+// On an arduino DUE or a MEGA2560 it's: 20(SDA), 21(SCL)
+// On an arduino LEONARDO it's: 2(SDA), 3(SCL), ...
 #define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 

From da3965a65a6e3a477e7b67305644b896e604100a Mon Sep 17 00:00:00 2001
From: Oliver Rafelsberger <19696982+Palmstroemen@users.noreply.github.com>
Date: Tue, 15 Dec 2020 20:57:10 +0100
Subject: [PATCH 2/3] Added some comment lines for pins used

No code-change
---
 examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino b/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino
index 03497858..cd949b3b 100644
--- a/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino
+++ b/examples/ssd1306_128x32_i2c/ssd1306_128x32_i2c.ino
@@ -27,6 +27,10 @@
 #define SCREEN_HEIGHT 32 // OLED display height, in pixels
 
 // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
+// The pins for I2C are fixed and defined by the Wire-library. 
+// On an arduino UNO it's: A4(SDA), A5(SCL)
+// On an arduino DUE or a MEGA2560 it's: 20(SDA), 21(SCL)
+// On an arduino LEONARDO it's: 2(SDA), 3(SCL), ...
 #define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 

From 595c287eeaed69c5f24dfccaa92e5854cc727ca5 Mon Sep 17 00:00:00 2001
From: Oliver Rafelsberger <19696982+Palmstroemen@users.noreply.github.com>
Date: Tue, 15 Dec 2020 21:23:09 +0100
Subject: [PATCH 3/3] Added some information about the used pins.

A4, A5 on a UNO,  20,21 on a MEGA.
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a0439dd9..a4ba5adb 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ This is a library for our Monochrome OLEDs based on SSD1306 drivers
   Pick one up today in the adafruit shop!
   ------> http://www.adafruit.com/category/63_98
 
-These displays use I2C or SPI to communicate, 2 to 5 pins are required to interface.
+These displays use I2C or SPI to communicate, 2 to 5 pins are required to interface. Arduinos have dedicated I2C-pins that are used by the Wire-Library. Like A4(SDA), A5(SCL) on a UNO or 20(SDA), 21(SCL) on a MEGA 2560. Look out for the I2C-pins of your board. 
 
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