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Using TCA9548A with OLED on Arduino
// Display - https://pmdway.com/collections/oled-displays/products/0-49-64-x-32-white-graphic-oled-i2c
// Guide - https://pmdway.com/blogs/product-guides-for-arduino/tutorial-using-the-0-49-64-x-32-graphic-i2c-oled-display-with-arduino
// TCA9548A - https://pmdway.com/blogs/product-guides-for-arduino/using-the-tca9548a-1-to-8-i2c-multiplexer-breakout-with-arduino
#include <Arduino.h>
#include <U8g2lib.h>
#include <Wire.h>
void TCA9548A(uint8_t bus)
{
Wire.beginTransmission(0x70); // TCA9548A address is 0x70
Wire.write(1 << bus); // send byte to select bus
Wire.endTransmission();
}
U8G2_SSD1306_64X32_1F_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
void setup()
{
Wire.begin();
u8g2.begin();
}
void loop()
{
TCA9548A(0); // tell the TCA9548A we want to use I2C bus number zero (to talk to the OLED)
// use the OLED as normal
for (int a = 999; a >= 0; --a)
{
u8g2.clearBuffer(); // clear the internal memory
u8g2.setFont(u8g2_font_inb24_mr ); // choose a suitable font
u8g2.setCursor(0, 24);
u8g2.print(a);
a = a - 47;
u8g2.sendBuffer(); // transfer internal memory to the display
delay(100);
}
}
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