Gravity: TCA9548A I2C Multiplexer Module

Q: <h3>When a main controller is connected to two expansion modules at the same time, the data will interfere with each other.</h3>

We have optimized this problem in our library file, you can disable the channel in the code, see the sample code in the link below for details:<a target="_blank" rel="noopener noreferrer" href="https://github.com/DFRobot/DFRobot_I2C_Multiplexer/blob/main/examples/multiSsd1306/multiSsd1306.ino">https://github.com/DFRobot/DFRobot_I2C_Multiplexer/blob/main/examples/multiSsd1306/multiSsd1306.ino</a><figure class="image"><img src="https://dfimg.dfrobot.com/628da052aa9508d63a41e164/makelog/37708bf16df3ef2f8bc55acab4d6b5d4_0x0.png.webp"></figure>

1. Example Code for Arduino-Two OLED Displays

This article guides you through the process of connecting and programming two OLED displays using Arduino and an I2C Multiplexer, featuring detailed hardware and software preparation, wiring diagrams, sample code, and additional information to optimize the use of the I2C Multiplexer library.

Reference

This reference offers detailed guidance on using the DFRobot I2C Multiplexer, including library downloads, installation instructions, and communication protocol insights, aimed at Arduino enthusiasts seeking to enhance their projects.

Parameter	Value
Operating Voltage	3.3~5.0V
Connector Type	PH2.0-4P
Interface Level	high 3.3V, low 0V
Interface Protocol	I2C(IIC)
I2C Clock Rate	100K, 400K
I2C Port Quantity	8
Default I2C Address	0x70 (dial switches all to 0)
I2C Address Range	0x70~0x77
Dimension	32 * 32mm / 1.26 * 1.26in

Num	Label	Description
+	VCC	Power VCC(3.3~5V)
-	GND	Power GND(0V)
C	SCL	I2C Clock Line - SCL
D	SDA	I2C Data Line - SDA
R	RESET	RESET PIN, Active Low

Gravity: TCA9548A I2C Multiplexer Module

Specification

Pinout

When a main controller is connected to two expansion modules at the same time, the data will interfere with each other.