1. This distribution board provides integrated power monitoring with the INA219 chip, allowing measurement of high voltage and DC current on I2C with an accuracy of ±1%. 2. Simple usage: power the sensor from 3 to 5 VDC, connect the two I2C pins to your microcontroller, then connect the target power supply to VIN+ and connect the load ground to VIN. 3. A 0.1 ohm, 1% tolerance shunt resistor forms the current sense path. The amplifier’s maximum input difference is ±320 mV, enabling measurements up to ±3.2 A. 4. With a 12-bit ADC, the resolution in the ±3.2 A range is 0.8 mA. When the internal gain is set to the minimum value div8, the maximum current is ±400 mA with a resolution of 0.1 mA. Advanced users can replace the 0.1 ohm current detection resistor with a different value to adjust the range (for example, 0.01 ohm can measure 32 A with a resolution of 8 mA). Use scenarios: - Prototyping microcontroller projects that require reliable monitoring of a 5 V rail (voltage and current) via I2C. - Benchtop testing of DC power supplies or battery packs where precise current measurement is needed. - Development and evaluation of small motor or load drives where a compact, single-sensor power monitor is advantageous.