TCA9548A I2C Multiplexer

I2C channel selector for multiple same-address sensors.

I2C MultiplexerRM8-RM22Intermediate

Arduino ✓ESP32 ✓Raspberry Pi ✓

Use TCA9548A in my FYP View related FYP titles

TCA9548A I2C Multiplexer electronics module illustration

AI Ready Overview

Quick Summary

TCA9548A is a i2c multiplexer commonly used in FYP and embedded projects. It is best for multiple same-address i2c sensors and sensor arrays, with wiring and testing planned around Arduino, ESP32, Raspberry Pi.

Difficulty

Intermediate

Time Required

1-2 weeks for wiring, basic code, platform integration and repeated test readings

Cost

RM8-RM22 module range in Malaysia; full project cost depends on scope.

Components

TCA9548A, Arduino, ESP32, Raspberry Pi

Overview

What is TCA9548A?

TCA9548A lets one controller talk to multiple I2C devices that share the same address. It is useful for multi-sensor dashboards and classroom comfort monitoring nodes.

Engineering Reference

Quick Specs

Operating Voltage	3.3V / 5V
Interface	I2C
Difficulty	Intermediate
Typical Malaysia Price	RM8-RM22
Best For	Multiple same-address I2C sensors, Sensor arrays

Real Usage Notes

Suitable / Not Suitable

Suitable for

✓ Multiple same-address I2C sensors
✓ Sensor arrays
✓ Modular dashboards

Not suitable for

✕ SPI devices
✕ Fixing bad wiring
✕ High-speed long cable I2C without planning

Build Planning

Difficulty

TCA9548A is rated Intermediate. Plan around 1-2 weeks for wiring, basic code, platform integration and repeated test readingsdepending on wiring, libraries, calibration, dashboard/app integration and testing evidence.

Build Planning

Time Required

1-2 weeks for wiring, basic code, platform integration and repeated test readings

Malaysia Price Guidance

Cost

Typical module price range: RM8-RM22. This is component guidance only; a complete FYP cost depends on controller, sensors, casing, display, app/dashboard, documentation and timeline.

Connections

Connection overview

Module revisions can use different connector names and electrical limits. Treat this as a planning overview and verify the exact board marking, manufacturer datasheet and seller documentation before wiring.

Power

Use only a supply supported by the exact board or module variant. Common listings for this part mention 3.3V or 5V.

Ground

Connect a common ground between the controller, module and any external supply.

Primary interface

Plan for I2C; confirm the exact terminal names in the manufacturer documentation.

Variant-specific connections

Connector names and optional pins can differ between breakout-board revisions.

Platform Notes

Wiring Guides

TCA9548A with Arduino / ESP32

This is a planning overview, not a board-specific pin map. Confirm the exact module revision, supply limits and I2C terminals in its datasheet before wiring. Use suitable level shifting when logic voltages differ.

Power	Confirm against the exact board; listed variants commonly use 3.3V / 5V
Ground	Common ground with the controller
Interface	I2C (exact pins vary by module)

Fix Common Problems