Datasheet

12
CIRC-03
.:Spin Motor Spin:.
.:Transistor & Motor:.
The Arduino's pins are great for directly controlling small electric
items like LEDs. However, when dealing with larger items (like a
toy motor or washing machine), an external transistor is required. A
transistor is incredibly useful. It switches a lot of current using a
much smaller current. A transistor has 3 pins. For a negative type (NPN)
transistor, you connect your load to collector and the emitter to ground. Then when a small current
flows from base to the emitter, a current will flow through the transistor and your motor will spin
(this happens when we set our Arduino pin HIGH). There are literally thousands of different types of
transistors, allowing every situation to be perfectly matched. We have chosen a P2N2222AG a rather
common general purpose transistor. The important factors in our case are that its maximum voltage
(40v) and its maximum current (600 milliamp) are both high enough for our toy motor (full details
can be found on its datasheet http://ardx.org/2222).
(The 1N4001 diode is acting as a flyback diode for details on why its there visit: http://ardx.org/4001)
Wire
Transistor
P2N2222AG (TO92)
x1
2.2k Ohm Resistor
Red-Red-Red
x1
2 Pin Header
x4
Toy Motor
x1
Arduino
pin 9
resistor
(2.2kohm)
gnd
(ground) (-)
Collector
Emitter
Base
Motor
+5 volts
Transistor
P2N2222AG
The transistor will have
P2N2222AG printed on it
(some variations will have
different pin assignments!)
Diode
(1N4001)
x1
Diode
.:download:.
breadboard layout sheet
http://ardx.org/BBLS03
.:view:.
assembly video
http://ardx.org/VIDE03
.:NOTE: if your arduino is resetting you need to install the optional capacitor:.
WHAT WE’RE DOING:
THE CIRCUIT:
Parts:
Schematic
The InternetThe Internet
CIRC-03
Breadboard Sheet
x1