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
Connection overview
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
INA219 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
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using INA219
Related Projects
Compare Options
Alternative Components
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