In this tutorial I2C communication is used between ESP32 and OLED, so we need the I2C address of the display. Generally, the I2C address of the 128*64 OLED is 0x3C. To find the I2C address, connect the OLED with the ESP32 and upload the below code and open the serial monitor. Now you got the address of the OLED. ESP32 has two I2C controllers which can be set as master mode or slave mode. Application Example¶ I2C master and slave example: peripherals/i2c.
The ESP32 datasheet contains about 3 paragraphs about the ADC, which basically say that it has an accuracy of +/-6%, see example code for ways to calibrate it (which probably amounts to a linear interpolation between two sample counts with the pin pulled to ground and AVDD). Oct 11, 2017 · B4A Tutorial [B4X] Smart String Literal B4A Tutorial [B4X] OkHttpUtils2 with Wait For Other Initial support for ESP32 B4R Tutorial Connecting two Arduinos with rWire library B4R Library LiquidCrystal_I2C
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