I'm working on a Bluetooth project which requires a motor to turn something. I had to purchase the H-Bridge L293D for reverse rotation capability of the motor.
It does work however, it has a 1.1volt bleed through on the non active logic pin. I've tested the leads from the micro controller Arduino without being connected to the H-Bridge. The none active lead shows 0 volts while the other active lead shows anywhere between 4.7 to 5.1vdc. Which is fine. However, once the leads are connected to the H-Bridge L293D the output leads should show same voltage. But they do not. The active lead reads anywhere between 3.8 and 4.1vdc sometimes up to 4.7vdc but not all the time. And the none active lead on the H-Bridge which should have 0vdc shows 1.1vdc. And the other way around as well. So anytime a lead connected to an output pin of the H-Bridge made not active by micro controller is not supposed to have voltage, right? But those leads show 1.1vdc.
Is the motor connected feeding an EMF back into the H-Bridge? The motor is a 5volt 500ma gear motor. The voltage to motor is 5vdc. The vdc to micro controller is also 5vdc, The vdc to H-Bridge is also 5vdc coming from the micro controller.
My question is why does an inactive output pin on the H-Bridge show 1.1volts? Can I get help/answers please.