A shunt resistor is used to measure electric current, alternating or direct. This is done by measuring the voltage drop across the resistor because of its resistor having a very low value of resistance. Shunt resistance should be 1/1000 or less of the total resistance. It is explained in detail [here](https://www.rohm.com/electronics-basics/resistors/shunt-resistors).
- edit code which come to illuminate LED the blightest (parameter is 255 )