ELEC 332

In the Lab II: Testing the H-Bridge Driver

Part 1: Assemble the Board

The assembly of your board should proceed as smoothly as in previous weeks with one exception: Since there are no connectors in the kit you received, you will have to prepare your own. The small parts cabinet has a drawer marked ".100 dual row headers" which contains connector strips 36 positions long. Using the razor saw from the tool drawer, saw off a piece of the appropriate length (5 positions).

Part 2: Modify PWM Software

Modify the mtr1.c program to provide bidirectional speed control. With the potentiometer in the center of its range, the motor should be stopped. As the potentiomener is turned clockwise, the motor should run in the forward direction with increasing speed. Turning the potentiometer counter clockwise from center should make the motor run in reverse. As noted in the previous section, there is no need to provide for current monitoring.

Part 3: Test the Board and Software

Plug everything together, build your program, turn on the power, and verify that your system works.

Part 4: Make Measurements

With the motor running at about half speed, measure and record the input and output waveforms of the H-bridge driver.