What is 'Pulse Width Modulation'???

This picture and the next few will demonstrate how we will be using 'Pulse Width Modulation' to vary the speed of our motors in both forward and reverse. Things to note: There are 2 lines on the oscilloscope. The top one, when on, indicates the motor is in forward direction, the bottom one, when on, indicates reverse. Also note the round thumbwheel to the lower right of the multi-meter. This is functioning as the control joystick. The multimeter is indicating the pulse frequency of the circuit. Here, the thumbwheel is 'off', and both forward and reverse lines are off.

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