TCA9548A I2C Multiplexer
I2C channel selector for multiple same-address sensors.
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
Pinout
VCC
Power input. Check whether the module expects 3.3V or 5V before wiring.
GND
Common ground with the controller and external supply.
I2C
Main I2C connection used by the module.
IO
Additional signal pins depend on the exact module variant.
Platform Notes
Wiring Guides
TCA9548A with Arduino / ESP32
Connect power, ground and the I2C signal lines. Use level shifting when a 5V module connects to a 3.3V controller.
| TCA9548A VCC | 5V or module-rated supply |
|---|---|
| TCA9548A GND | Controller GND |
| Signal pins | I2C |
Fix Common Problems
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using TCA9548A
Related Projects
Compare Options
Alternative Components
Student Questions
FAQ
Is TCA9548A good for FYP projects?
Yes, TCA9548A is suitable for FYP work when the project matches its limits: Multiple same-address I2C sensors and Sensor arrays.
What is the most common TCA9548A mistake?
Using it when address can be changed