INA219 Current / Voltage Sensor
by TI / module
SKU: PSA-CMP-INA219
No reviews yetTypical India street price
₹80–₹180
Measure project current and battery voltage — efficiency labs.
Interface: I2C
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Concept
A precision amplifier reads voltage across a 0.1 Ω shunt plus bus voltage.
A little theory
P = V × I. 12-bit ADC, programmable gain. Address 0x40 default. In the classroom, treat INA219 Current / Voltage Sensor as a intermediate part using I2C. Typical India street price is about ₹80–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Adafruit_INA219 getCurrent_mA(), getBusVoltage_V(). Put shunt in series with the load.
Classroom & project use
- Solar I–V curves
- Motor stall current
- Battery runtime
Buying in India
Precautions
- Don’t exceed shunt current
- High side vs low side wiring
Specifications
| Bus | 0–26V |
| Shunt | 0.1Ω typical |
| Category | Sensors |
| Difficulty | Intermediate |
| Voltage | 3.3–5V logic; bus to 26 V |
| Interface | I2C |
Pinout
VCC | GND | SCL | SDA (confirm address with I2C scanner)
