Arduino 通过TCA9548A 或其他IIC扩展实现12个传感器的数据读取？

你好 我将两个TCA9548A进行级联以后 用端口检索程序检索不到第二片TCA9548A的地址 两片芯片没有问题

/**
 * TCA9548 I2CScanner.pde -- I2C bus scanner for Arduino
 *
 * Based on code c. 2009, Tod E. Kurt, http://todbot.com/blog/
 *
 */

#include "Wire.h"
extern "C" {
#include "utility/twi.h"  // from Wire library, so we can do bus scanning
}

#define TCAADDR 0x70

void tcaselect(uint8_t i) {
  if (i > 7) return;
 
  Wire.beginTransmission(TCAADDR);
  Wire.write(1 << i);
  Wire.endTransmission(); 
}

// standard Arduino setup()
void setup()
{
    while (!Serial);
    delay(1000);

    Wire.begin();
   
    Serial.begin(115200);
    Serial.println("\nTCAScanner ready!");
   
    for (uint8_t t=0; t<8; t++) {
      tcaselect(t);
      Serial.print("TCA Port #"); Serial.println(t);

      for (uint8_t addr = 0; addr<=127; addr++) {
        if (addr == TCAADDR) continue;
     
        uint8_t data;
        if (! twi_writeTo(addr, &data, 0, 1, 1)) {
           Serial.print("Found I2C 0x");  Serial.println(addr,HEX);
        }
      }
    }
    Serial.println("\ndone");
}

void loop()
{
}