@mainali said in INA219 DC Current Sensor: MySensor gw; I am building similar system. However, i am facing a lot of difficulties to make the ACS712 working. I have tried your code as well without success. The effective value of the current is always 0 mA even if the light is ON. For the moment, i am testing with 5V current and i switch on a LED. maybe the current is too low to make working my 20A ACS712? If anyone has some ideas, it will be very greatful :) Thanks a lot.