Arduino uno User Guide

11
Pin 2 can be any digital I/O pin on your Arduino. Connect the minus of the battery to the emitter
of the transistor (E pin) and also connect the emitter of the transistor to Gnd on the Arduino
board.
To check if things are working, take a jumper wire and short the collector to the emitter pins of
the transistor. The motor should turn on. Next, disconnect the 1K resistor from pin 2 and jumper
it to +5V. The motor should turn on. Put the resistor back into pin 2 and run the following test
program:
void setup()
{
pinMode(2,OUTPUT);
digitalWrite(2,HIGH);
delay(1000);
digitalWrite(2,LOW);
}
void loop()
{}
The motor should turn on for 1 second.
Pin 2
Gnd
Pin 2Pin 2
Gnd
Pin 2

Arduino uno Specifications

General

Form factor	Arduino
Certification	RoHS, FC, CE
Processor model	-
Processor frequency	- MHz
Microcontroller model	ATmega328
Microcontroller frequency	16 MHz
DC input voltage	7-12 V
Operating voltage	5 V
DC current per I/O pin	40 mA
Flash memory	0.032 MB
Maximum internal memory	- GB
SRAM (Static Random Access Memory)	2 KB
EEPROM (Electrically Erasable Programmable Read-Only Memory)	1 KB
Wi-Fi	No
Number of analog I/O pins	6
Number of digital I/O pins	14

Weight and Dimensions

Board dimensions	53.4 x 68.6 mm