Getting Started

Chapter 7: Microcontroller Interrupts and Timers

330 Ohm to 4N28 pin 1 To PORTD PIN 1

4N28 pin 2 to +3v GND

TIP115

Diode 1N4001

2.2k Ohm from 4N 28

pin51 to TIP115 pin 1

4N28 pin 4 to 9v GND

+9v to TIP115 pin 3 9v GND

Motor a to TIP115 pin 2

Motor b to 9v GND

Figure 19: Motor Speed Control Breadboard Labeled........................................

Figure 20: Motor Speed Control Hardware