Page 37
Circuit 2
PARTS:
Wire
19
X
IC
1
X
330Ω
Resistor
8
X
LED
8
X
Circuit 2
Up until now, we’ve focused solely on outputs. Now
we’re going to go to the other end of spectrum and
play around with inputs. In this circuit, we’ll be
looking at one of the most common and simple
inputs – a push button. e way a push button works
with RedBoard is that when the button is pushed, the
voltage goes LOW. e RedBoard reads this and
reacts accordingly. In this circuit, you will also use a
pull-up resistor, which keeps the voltage HIGH when
you're not pressing the button.
Push Buttons
PARTS:
Wire
7
X
CIRCUIT #5
5
Push Button
2
X
LED
1
X
330Ω
Resistor
1
X
10KΩ
Resistor
2
X
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
Resistors (330 ohm)
(Orange-Orange-Brown)
Resistors (10K ohm)
(Brown-Black-Orange)
LED
(Light-Emitting Diode)
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