The INA219 based Current sensor module is an I 2 C interface based zero drift ... First of all, setup your hardware as shown in the below diagram: Next, upload the following code to your Arduino Uno.

And next the all-important schematic (Figure 2): Figure 2 Schematic diagram of calibration station ... in a similar manner but has 9 wraps around its box, so the sensor sees the current in 10 wires ...