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Grove - 8 Channel I2C Multiplexer/I2C Hub (TCA9548A)

We've already released the Grove - I2C Hub (4 Port) and the Grove - I2C Hub (6 Port). Wait, still not enough? Well well, we know you are seeking more. Here you are, we present you the Grove - 8 Channel I2C Hub.

More importantly, this is more than just a superposition of port quantities. As we all know, I2C devices must use different addresses in the same bus system, even use the Grove I2C Hub (4 or 6 port), the rule is still the rule. However, with the help of Grove - 8 Channel I2C Hub, you can plug up to 8 same-address I2C devices to the same Grove I2C system. All thanks to the TCA9548A I2C Multiplexer Chip. It adopts time-division multiplexing technology so that the same controller can control 8 I2C devices with the same address. No more worrying about address conflicts.

Features​

  • 8 Grove I2C Port
  • Support multiple devices with the same I2C address
  • Support 3.3V/5V System

Platform Supported​

ArduinoRaspberry Pi

Getting Started​

Read the I2C address of devices connecting on the Grove - 8 Channel I2C Hub​

Materials Required​

Seeeduino XIAOGrove BreadboardGrove - 8 Channel I2C Multiplexer/I2C Hub (TCA9548A)
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We also require up to 8 I2C devices, please click here to find the Grove I2C devices you like. At these example, we use three I2C devices.

Hardware connection​

Connect the I2C Hub with Seeeduino XIAO's I2C interface, and connect each I2C device with each hub.

Software code​

#include "TCA9548A.h"

// if you use the software I2C to drive, you can uncommnet the define SOFTWAREWIRE which in TCA9548A.h. 
#ifdef SOFTWAREWIRE
  #include <SoftwareWIRE.h>
  SoftwareWire myWIRE(3, 2);
  TCA9548A<SoftwareWire> TCA;
  #define WIRE myWIRE
#else   
  #include <Wire.h>
  TCA9548A<TwoWire> TCA;
  #define WIRE Wire
#endif

#define SERIAL Serial

void setup()
{
  SERIAL.begin(115200);
  while(!SERIAL){};

  //WIRE.begin();
  TCA.begin(WIRE);
  //defaut all channel was closed
  //TCA.openAll();
  //TCA.closeAll();

  // Select the channels you want to open. You can open as many channels as you want
  TCA.openChannel(TCA_CHANNEL_0);   //TCA.closeChannel(TCA_CHANNEL_0);
  TCA.openChannel(TCA_CHANNEL_1); //TCA.closeChannel(TCA_CHANNEL_1);
  TCA.openChannel(TCA_CHANNEL_2); //TCA.closeChannel(TCA_CHANNEL_2);
  TCA.openChannel(TCA_CHANNEL_3); //TCA.closeChannel(TCA_CHANNEL_3);
  TCA.openChannel(TCA_CHANNEL_4); //TCA.closeChannel(TCA_CHANNEL_4);
  TCA.openChannel(TCA_CHANNEL_5); //TCA.closeChannel(TCA_CHANNEL_5);
  TCA.openChannel(TCA_CHANNEL_6); //TCA.closeChannel(TCA_CHANNEL_6);
  TCA.openChannel(TCA_CHANNEL_7); //TCA.closeChannel(TCA_CHANNEL_7); 

}

void loop()
{

  uint8_t error, i2cAddress, devCount, unCount;

  SERIAL.println("Scanning...");

  devCount = 0;
  unCount = 0;
  for(i2cAddress = 1; i2cAddress < 127; i2cAddress++ )
  {
    WIRE.beginTransmission(i2cAddress);
    error = WIRE.endTransmission();

    if (error == 0)
    {
      SERIAL.print("I2C device found at 0x");
      if (i2cAddress<16) SERIAL.print("0");
      SERIAL.println(i2cAddress,HEX);
      devCount++;
    }
    else if (error==4)
    {
      SERIAL.print("Unknow error at 0x");
      if (i2cAddress<16) SERIAL.print("0");
      SERIAL.println(i2cAddress,HEX);
      unCount++;
    }    
  }

  if (devCount + unCount == 0)
    SERIAL.println("No I2C devices found\n");
  else {
    SERIAL.print(devCount);
    SERIAL.print(" device(s) found");
    if (unCount > 0) {
      SERIAL.print(", and unknown error in ");
      SERIAL.print(unCount);
      SERIAL.print(" address");
    }
    SERIAL.println();
  }
  SERIAL.println();
  delay(1000); 
}

  • Step 1 Download the library from the resource and add the "zip" library to your Arduino IDE. Please refer to How to install an Arduino Library.

  • Step 2 Find the example code and upload it to your board. Please refer to How to upload code.

  • Step 3 After uploading the code, you will see the I2C adress of each device from the serial monitor. The adress 0x70 is the I2C adress of I2C Hub.

Schematic Online Viewer​

Resource​

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