![]() Keep in mind that you can only select one channel at a time. ![]() Other circuit and code can be imagined to develop your own functionalities. It is possible with this simple component to increase the number of I/O of a microcontroller. It is a good idea to put pull-up resistors on all channels of TCA9548A, even if the voltages are the same. The first hardware serial port for debugging purposes and the second serial port for. I used SIM800L for internet connectivity and RS480 bus used for communicating with the sensor nodes. The project was based on ATmega328P which is the heart of Arduino Uno. Using I2C multiplexers or going to software I2C, its not hard to extend it to. ![]() All I/O pins of TCA9548A are 5-volt tolerant and can also be used to translate from high to low or low to high voltages. A few years back I developed a project SIM module-based IoT data logging system for sensor data. How do you connect more than one Arduino serial port together (serial. Constants #define number_of_mux 1 #define numOfMuxPins number_of_mux * 8 #define enPin 2 #define channelA 4 #define channelB 7 #define channelC 8 //Parameters const int comPin = 3 void setup ( ) Results The multiplexer supports both normal (100 kHz) and fast (400 kHz) I2C protocols. To select a channel on the multiplexer, we need to activate the integrated circuit by setting the INH pin to LOW, and setting the channels A,B and C to the values descripbed in the logic table.
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