INA Meter is an application for Flipper Zero that allows you to read I2C-connected current/power monitors from Texas Instruments.
- INA219 – 0–26V, 16-bit resolution (±0.5% accuracy)
- INA226 – 0–36V, 16-bit resolution (±0.1% accuracy)
- INA228 – 0–85V, 20-bit resolution (±0.05% accuracy)
| Flipper pin | INAxxx |
|---|---|
| C0 (16) | SCL |
| C1 (15) | SDA |
- Launch the application and go to the configuration menu by pressing the LEFT button.
- Select the sensor type, configure its I2C address, and set the shunt resistance.
- Once the settings are complete, press the BACK button to return to the Current Gauge Screen.
- If the sensor is connected properly, the Current Gauge Screen will display the bus voltage and the current flowing through the shunt resistor.
The application provides a simple way to configure conversion time and sample averaging with four preset levels: Low, Medium, High, and Max. These settings are sensor-specific:
| Low | Medium | High | Max | |
|---|---|---|---|---|
| INA219 | 532μs x 128 | 532μs x 128 | 532μs x 128 | 532us x 128 |
| INA226 | 140μs x 1024 | 588μs x 1024 | 2116μs x 1024 | 8244us x 1024 |
| INA228 | 50μs x 1024 | 280μs x 1024 | 1052μs x 1024 | 4120us x 1024 |
The precision can be set independently for VBUS and shunt voltage measurements.
Each sensor operates within a fixed voltage range, with a defined resolution for both bus voltage (VBUS) and shunt voltage (VSHUNT) measurements. The values below indicate the maximum measurable voltage and the smallest detectable voltage step for each parameter.
| VBUS Max | VBUS Resolution | VSHUNT Max | VSHUNT Resolution | |
|---|---|---|---|---|
| INA219 | 26V | 4mV | ±320mV | 10μV |
| INA226 | 36V | 1.25mV | ±81.92mV | 2.5μV |
| INA228 | 85V | 195.315μV | ±160mV | 312.5nV |