INA219 Current Sensor
I2C current and voltage monitor for battery and solar projects.
AI Ready Overview
Quick Summary
INA219 is a current sensor commonly used in FYP and embedded projects. It is best for solar monitoring and battery current logging, 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-RM25 module range in Malaysia; full project cost depends on scope.
Components
INA219, Arduino, ESP32, Raspberry Pi
Overview
What is INA219?
INA219 measures bus voltage and current over I2C. It is useful for battery percentage, solar monitoring and power consumption analysis in FYP systems.
Engineering Reference
Quick Specs
| Operating Voltage | 3.3V / 5V |
|---|---|
| Interface | I2C |
| Difficulty | Intermediate |
| Typical Malaysia Price | RM8-RM25 |
| Best For | Solar monitoring, Battery current logging |
Real Usage Notes
Suitable / Not Suitable
Suitable for
- ✓ Solar monitoring
- ✓ Battery current logging
- ✓ Power consumption analysis
Not suitable for
- ✕ High-current loads beyond shunt rating
- ✕ AC current measurement
- ✕ Mains voltage work
Build Planning
Difficulty
INA219 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-RM25. 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
INA219 with Arduino / ESP32
Connect power, ground and the I2C signal lines. Use level shifting when a 5V module connects to a 3.3V controller.
| INA219 VCC | 5V or module-rated supply |
|---|---|
| INA219 GND | Controller GND |
| Signal pins | I2C |
Fix Common Problems
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using INA219
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Student Questions
FAQ
Is INA219 good for FYP projects?
Yes, INA219 is suitable for FYP work when the project matches its limits: Solar monitoring and Battery current logging.
What is the most common INA219 mistake?
Wiring load path incorrectly