Datasheet

Chapter 2 • Shield, Lights, Servo Motors
50 • Robotics with the BOE Shield-Bot
The prototyping area also has black sockets along the top, bottom, and left.
Top: these sockets have three supply voltages for the breadboard: 3.3 V, Vin (input voltage
from either battery pack or programming cable), and 5 V.
Bottom-left: The first six sockets along the bottom-left are ground terminals, labeled GND;
think of them as a supply voltage that’s 0 V. Collectively, the 3.3V, Vin (voltage-in), 5V and
GND are called the power terminals, and they will be used to supply your circuits with
electricity.
Bottom-right: The ANALOG IN sockets along the bottom-right are for measuring variable
voltages; these connect to the Arduino module’s ANALOG IN sockets.
Left: The DIGITAL sockets on the left have labels from 0 to 13. You will use these to connect
your circuit to the Arduino module’s digital input/output pins.
Digital and analog pins are the small pins on the Arduino module’s Atmel microcontroller
chip. These pins electrically connect the microcontroller brain to the board.
A sketch can make the digital pins send high (5 V) or low (0 V) signals to circuits. In this
chapter, we’ll do that to turn lights on and off. A sketch can also make a digital pin monitor
high or low signals coming from a circuit; we’ll do that in another chapter to detect whether
a contact switch has been pressed or released.
A sketch can also measure the voltages applied to analog pins; we’ll do that to measure light
with a phototransistor circuit in another chapter.
LED Test Circuit
Parts List
(2) LEDs – Red
(2) Resistors, 220 Ω (red-red-brown)
(3) Jumper wires