Arduino Development Cookbook Cornel Amariei by Unknown

Author:Unknown
Language: eng
Format: epub

Motor Control

How to do it…

The following are the steps to connect a motor using a transistor:

1. Connect the Arduino GND to the long strip on the breadboard.

2. Connect one of the motor terminals to VIN or 5V on the Arduino. We use 5V if we power the board from the USB port. If we want higher voltages, we could use an external power source, such as a battery, and connect it to the power jack on Arduino.

However, even the power jack has an input voltage range of 7 V–12 V. Don't exceed these limitations.

3. Connect the other terminal of the motor to the collector pin on the NPN transistor.

Check the datasheet to identify which terminal on the transistor is the collector.

4. Connect the emitter pin of the NPN transistor to the GND using the long strip or a long connection.

5. Mount a resistor between the base pin of the NPN transistor and one digital pin on the Arduino board.

6. Mount a protection diode in parallel with the motor. The diode should point to 5V if the motor is powered by 5V, or should point to VIN if we use an external power supply.

Schematic

This is one possible implementation on the ninth digital pin. The Arduino has to be powered by an external supply. If not, we can connect the motor to 5V and it will be powered with 5 volts.

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