Page 46 - FUNDAMENTALS OF COMPUTER

NPP

46 Fundamentals of Computers NPP

1.19 Joystick 1.19 Om°`pñQ>H$
This is also a pointing device similar to a `h ^r _mCg Ho$ g_mZ hr EH$ bmoHo$Q>a `m nm°BªqQ>J
mouse. It contains a stick mounted on a spheri- `wpŠV h¡ Ÿ& BZ_| EH$ pñQ>H$, ñ\o$[aH$b ~m°b go Ow‹S>r hmoVr
cal ball, which moves on a socket. There are h¢Ÿ& `h ~m°b gm°Ho$Q> _| aIr hmoVr h¢Ÿ& ~m°b H$s Mma àH$ma
four motions which are detected by the circuit- H$s J{V`m| H$mo n[anW g_P gH$Vm h¡ … (1) XmE±
(1) left (2) right (3) forward (4) backward. (2) ~mE± (3) AmJo (4) nrN>o Ÿ&
The potentiometers are used with the ball. J|X Ho$ gmW n[adV©Zr` à{VamoYm| H$m Cn`moJ hmoVm
The change in resistance of potentiometer indi- h¡Ÿ& à{VamoY _| n[adV©Z go Mbr JB© Xyar H$m nVm MbVm
cates the distance travelled. Thus, a screen cur-
sor also moves rapidly with the movement of h¡ & ñH«$sZ na EH$ H$g©a pñQ>H$ Ho$ AZwgma J{V H$aVm
joystick. It is used in video games and as an h¡Ÿ& BgH$m Cn`moJ {d{S>`mo Jo_ _| VWm H$B© H$åß`yQ>g© _|
input device in many computers. It has limited BZnwQ> `wpŠV Ho$ g_mZ {H$`m OmVm h¡Ÿ&
movement range.

Stick
Socket
Ball

Fig. 1.7: Joystick

1.20 Light Pen 1.20 bmB©Q> noZ
Screen Switch

Photo Flip-
cell Amplifier Flop

Cable

Lens To CPU
Fig. 1.8: Light Pen
A light pen is a picking device. That means `h EH$ {nqH$J `wpŠV h¡Ÿ& Bggo VmËn`© h¡ {H$ O~
when light pen points to certain item on the bmB©Q> noZ H$mo CRT ñH«$sZ na {H$gr q~Xw Ho$ gm_Zo aIm