Data Sheet

14 : circuit 1a
DIGITAL OUTPUT: When working with
microcontrollers such as the RedBoard, there are a
variety of pins to which you can connect electronic
components. Knowing which pins perform which
functions is important when building your circuit.
In this circuit, we will be using what is known as a
digital output. ere are 14 of these pins found on the
RedBoard. A digital output only has two states: ON
or OFF. ese two states can also be thought of as
HIGH or LOW, TRUE or FALSE. When an LED is
connected to one of these pins, the pin can only perform two jobs: turning on the LED and turning o the
LED. We’ll explore the other pins and their functions in later circuits.
POLARIZED
COMPONENTS
Pay close attention to the LED. e
negative side of the LED is the short leg,
marked with a at edge.
FLAT EDGE
SHORT LEG
–
+
RESISTOR
LEADS
Components like resistors need to have
their legs bent into 90° angles in order to
correctly t in the breadboard sockets.
NEW IDEAS
ELECTRICAL SAFETY: Never work on your circuits while the board is connected to
a power source. The SparkFun RedBoard operates at 5 volts, which, while not enough to
injure you, is enough to damage the components in your circuit.
COMPONENT ORIENTATION & POLARITY: Instructions on how to orient each of
the new components will be given before each circuit diagram. Many components have
polarity and have only one correct orientation, while others are nonpolarized.
IOREF RESET
RESET
7-15V
SCL
SDA
AREF
GND
13 12
~11 ~10
~9
8
7
~6 ~5
4
~3
2 1 0
TX
RX
13
3.3V 5V GND GND VIN
A0 A1 A2 A3 A4 A5
POWER ANALOG IN
DIGITAL (PWM~)
ON
ISP
TX
RX
START SOMETHING
SIK v4 Book Oct 13.indb 14 10/18/17 9:59 AM