ࡱ> ]_\o@ bjbj p p -oo6 K 88 D cld d 4 M M M EcGcGcGcGcGcGc$2eRgkc@ @M @@kc uc@@  Ec@Ect^ Bb X ֍ @1`<!c$c0cm`|`h `hxb`hb8M > , $ eM M M kckc  Using System Modules Timing Process Connect a Touch sensor board to the battery block along with a transistor switch and an LED output block. You should be able to turn the LED on just by touching the touch pad. If it doesnt work, then replace the transistor switch with a Darlington switch. Finally try a Field Effect Transistor (FET) switch. The FET takes no current at all, so is very useful for touch sensors. Which blocks worked? Transistor Darlington FET Now use the Touch Timer block with the Transistor switch. You should see the LED come on and then go out. Use the Darlington switch and the LED should come on and then slowly go out. Replace the Darlington with the FET and now what happens with the LED? See whether you get a different result if you give the touch timer a very brief touch or a longer, firm touch. The capacitor stores electric charge and this produces a voltage difference across the capacitor terminals. This means that when you touch the sensor the capacitor charges through your finger so that the voltage across the capacitor goes up and therefore the voltage at the input to the switch block. A brief touch may mean that the capacitor doesnt get fully charged. You can use a modified or buffered touch timer by using a small capacitor to charge quickly, turn a transistor on, which then charges the main capacitor, making sure that it gets a full charge. Try it with the buffered timer block. A timer block is usually called a monostable it has one stable state (usually off) and it switches to the on state for a fixed period of time. The time period is set by the value of the capacitor and the resistor it has to discharge through. For the FET driver/switch that resistor has a value of 20M very big. The time constant in seconds is gained by multiplying the value of the resistor by the value of the capacitor. 10uF times 20M gives 200 seconds. How long is yours on for? Now try the 555 Monostable. The 555 integrated circuit is specially designed as a timer.  Finally, because the FET doesnt use any current, if you get rid of the gate resistor then theoretically the LED should stay on forever. Try the touch bistable block. This combines two touch sensors with a FET to give a circuit that will stay on or stay off depending on which sensor pad you touch. PAGE   FILENAME 6b System Module Capacitors.doc page  PAGE 4 '( 67=>?ABLMlmtu{|}~{nhX?0JCJmHnHuh^h^0JCJjh^h^0JCJUhX?CJmHnHuh^h^CJjh^h^CJUh^ h^0Jjh^0JUjhmCJUhmCJ^JnH tH hm^JaJnH tH jhmU^JaJnH tH hm&' T U 56!!!o!v:!!!BK!!P!!!!! !gdvF & F0`0 & F0`0  & F0`0 & F 0`0 & F 0`0  3 J ^ & F0`066?@A!v:gdvF  r !h]hgd^h]hgd^ &`#$gd^10&P 1hP:p^. 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