ARDX-experimenters-g.. - Oomlout
ARDX-experimenters-g.. - Oomlout
ARDX-experimenters-g.. - Oomlout
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CIRC-03.:Spin Motor Spin:..:Transistor & Motor:.What We’re Doing:The Arduino's pins are great for directly controlling small electricitems like LEDs. However, when dealing with larger items (like atoy motor or washing machine), an external transistor is required.A transistor is incredibly useful. It switches a lot of current using amuch 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 smallcurrent flows from base to the emitter a current will flow through the transistor and your motor willspin (this happens when we set our Arduino pin HIGH). There are literally thousands of differenttypes of transistors, allowing every situation to be perfectly matched. We have chosen a P2N2222AGa rather common general purpose transistor. The important factors in our case are that its maximumvoltage (40 v) and its maximum current (600 milliamp) are both high enough for our toy motor (fulldetails can be found on its datasheet http://tinyurl.com/o2cm93 )note: the transistor we use has a in order: Base Collector Emitter pinout (differing from some other popular transistors)(The 1N4001 diode is acting as a flyback diode for details on why its there visit: http://tinyurl.com/b559mx)The Circuit:Parts:CIRC-03Breadboard sheetx12.2k Ohm ResistorRed-Red-Redx12 Pin Headerx4Toy Motorx1TransistorP2N2222AG (TO92)x1Diode(1N4001)x1WireSchematic:Arduinopin 9the transistor will haveP2N2222AG printed on it(some variations will havethe pin assignment reversed)resistor(2.2kohm)BaseCollectorDiodeMotorTransistorP2N2222AGEmittergnd(ground) (-)+5 voltsThe Internet.:download:.breadboard layout sheethttp://tinyurl.com/d6jv63.:view:.assembling videohttp://tinyurl.com/djapjg12