Arduino: Hello World for ESP32 + I2C SSD1306 OLED

I saw a lot of ESP32 introduction articles, fancy its wifi and Bluetooth support, and can also use the Arduino IDE to develop, so itchy, from a treasure into an ESP-WROOM-32 development board to play.

The Arduino environment was built with reference to the brother's article, and I would like to thank you for this:ESP32 arduino IDE 1.8.5 development environment to build。

Summarize a few key points:
1. In addition to the newer Arduino IDE, install python2.7 (bad news: Python 2.7 will reach the end of its life on January 1st, 2020.). Haven't tried 3.x yet.
2. Create a new directory espressif\esp32 under C:\Program Files (x86)\Arduino\hardware\;
3, fromhttps://github.com/espressif/arduino-esp32Download the zip and extract its contents to C:\Program Files (x86)\Arduino\hardware\espressif\esp32\;
4. You must run C:\Program Files (x86)\Arduino\hardware\espressif\esp32\tools\get.exe as an administrator.
5, similar to UNO's 13th PIN connection onboard LED, my ESP32 development board LED is No. 2 PIN. So you can change the built-in LED to 2 when you brush the blinker demo. In addition to the ESP32 example, there is an AnalogOut LEDSoftwareFade breathing light effect is also very interesting, can be used as a test program. Also change the LED_PIN to 2.

==========

Next, you can experiment with I2C OLED.

Wiring: Vcc and GND are not much to say, a 3.3V GND. D21 corresponds to SDA; D22 corresponds to SCL.
driver: library management, search keyword ssd1306 esp32

Refer to the sample code:

#include "SSD1306.h"

SSD1306 display(0x3c, 21, 22);

void setup() {
display.init();

display.setFont(ArialMT_Plain_24);
display.drawString(0, 0, "Hello World");
display.display();
}

void loop() {

}

Reference materials:
https://techtutorialsx.com/2017/12/02/esp32-arduino-interacting-with-a-ssd1306-oled-display/

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