tca9548a-oled-bmp180.ino

// 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
// BMP180 - https://pmdway.com/collections/altitude-sensors/products/bmp180-barometric-pressure-sensor-board
// BMP180 library - https://github.com/adafruit/Adafruit-BMP085-Library

#include <Arduino.h>
#include <U8g2lib.h>
#include <Adafruit_BMP085.h>
#include <Wire.h>

U8G2_SSD1306_64X32_1F_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

Adafruit_BMP085 bmp;

int temperature;

void TCA9548A(uint8_t bus)
{
  Wire.beginTransmission(0x70);  // TCA9548A address is 0x70
  Wire.write(1 << bus);          // send byte to select bus
  Wire.endTransmission();
}

void setup()
{
  Wire.begin();
  u8g2.begin();
  TCA9548A(7);    // select I2C bus 7 for the BMP180
  if (!bmp.begin())
  {
    Serial.println("Could not find a valid BMP085 sensor, check wiring!");
    while (1) {}
  }
}

void loop()
{
  // first, get the temperature from the BMP180
  TCA9548A(7);    // select I2C bus 7 for the BMP180
  temperature = int(bmp.readTemperature());

  // next, display the temperature on the OLED
  TCA9548A(0); // select I2C bus 0 for the OLED
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_inb24_mr );  // choose a suitable font
  u8g2.setCursor(0, 24);
  u8g2.print(temperature);
  u8g2.sendBuffer();
  delay(100);
}