Bi-Directional Motor Control

January 13,2016
In this lab we were first tasked with using a double-pole, double throw relay to get our motor to turn in two directions. I learned that the DPDT relay is switching the direction of current flow through the motor to get it to turn in either direction. We used a TIP102/120 transistor it must be able to handle the motor currents. I also learned that, in order to control the motor, you connect the ON/OFF pin to the motor, while connecting the direction pin to +9V that controls direction.

In another part of this lab, we were responsible for creating an Hbridge circuit. For this circuit we uses four transistors to guide the flow of electricity. Another thing that was learned , was that at one time two switches of the same side cannot be on at the same time or it will cause a short circuit. The purpose of an Hbridge is to prevent short circuiting between the switches on the same side. If the bridge is sufficiently powerful it will absorb that load and our batteries will simply drain quickly.





















For the last part of this lab we had to demonstrate the HBridge circuit controlling the motor using an Adruino board. In this part we had to hook up the adruino board with the bread boar that our circuit was on. The same line of code that was used to make a light blink on and off was then used to make the motor turn on and off.