Circuit 2
PARTS:
CIRCUIT #5
5
IC
1
X
LED
8
X
Circuit 2
In this circuit, we are going to use some of the lessons we
learned in circuit 12 to control a relay. A relay is basically
an electrically controlled mechanical switch. Inside that
harmless looking plastic box is an electromagnet that,
when it gets a jolt of energy, causes a switch to trip. In
this circuit, you’ll learn how to control a relay like a pro
– giving your RedBoard even more powerful abilities!
Relays
PARTS:
CIRCUIT #13
13
Transistor
P2N2222AG
1
X
Relay
1
X
1
X
Diode
1N4148
Wire
14
X
330Ω
Resistor
2
X
LED
2
X
When the relay is off, the COM (common)
pin will be connected to the NC (Normally
Closed) pin. When the relay is on, the COM
(common) pin will be connected to the NO
(Normally Open) pin.
IOREF
RES
ET
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
DIGIT
AL (PWM~)
ON
ISP
TX
RX
LEARN. SHARE. HACK.
RedBoard
Transistor
(P2N2222AG)
SPDT Relay
Diode
(1N4148)
Resistor (330 ohm)
(Orange-Orange-Brown)
Resistor (330 ohm)
(Orange-Orange-Brown)
LEDs
(Light-Emitting Diodes)
GND
(Ground)
5 volt
PIN 2
Page 69
Summary of Contents for RedBoard
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