This tutorial is about how to measure dc direct current with arduino. I am going to measure current using a hall effect sensor by allegro ‘Acs712′. Acs712 has three variations. ACS712ELCTR-05B-T can measure current from -5 to +5 Amperes. ACS712ELCTR-20A-T can measure current from -20 to +20 Amperes. ACS712ELCTR-30A-T can measure current from -50 to +50…