Discussion in 'Modding' started by disco volante, 21 Jul 2003.
Cool, do I smell a how to coming up?
Power can come from anywhere provided that it is 5 volts. The transistor can be any NPN small signal transistor such as a 2N2222 or a 2N3904. I help teach an electronics class at a museum. I asked for 5 of the QT113Hs to see if they would be good for general use. A few days later, 50 arrive.
Sorry to quote myself but I need this answered if possable. Thanks
Also do they make these for 12v...I didnt see any
will this work for the electrode ....Transparent Electrical Film
No, you need to use 5 volts. You also need to connect a capacitor between pins 6 and 7 and tie pins 3 and 4 to ground or 5 volts depending on what functions you want. Where did you find that electrical film at?
Ok how would I do this....where would I hook up the LED lines and is that ok where the resistor is? thanks
Where do you get that transparent electrical film!?!?!? it is just what i need for my clear traces!!!
Depends on what you want to do. A 0.01 capacitor goes between pins 6 and 7. The LEDs go between pins 2 and 8. If you want the sensor to turn the LEDs on when a finger is touching the plate, then tie pin 3 low and 4 high. If you want to have the LEDs turn on and stay on until the next time someone touches the plate, tin pins 3 and 4 low. Gain is determined by pin 5. Tie it low for low gain, high for high gain. (Low refers to ground/earth, high refers to +5 volts.)
Ok you lost me, remember I have the brain of a 5yr old. Whats the .01 capacitor? I want the LEDs to be turned on and stay on till some1 touchs it again. Thats pretty much it. What do u mean by tie it to low or high? thanks sorry for the noobish questions.
The 0.01 microfarad (uF) capacitor goes between pins six and seven and determines sensitivity. If you put a 0.1 microfarad capacitor between pins six and seven, the switch would activate before you actually touched the pad. Upon further inspection, the clear conductive film may not work with this application, although you're welcome to try and post your findings. Pin 2 goes to LED + and earth/pin 8 goes to LED -. For your application, connect pins three and four to earth and connect pin five to +5 volts.
tx viridius....the resistor is in the right place right? Also I take it soldering is the best solution for connecting the wires? Thanks
oh ya...do they make 12v of these I didnt see any but I could of missed it?
The resistor is fine where it is. Position isn't an issue. I haven't seen 12 volt flavors of the QProx sensors, but you can just run them off of the 5 volt rail or buy a 7805 or some other voltage regulator IC.
ya I have some 12 auto LED kits and I would love to hook those up to the touch switch. Thanks for the help
Sorry just thought up another question....for the capacitor could I just use any type of metal? Would aluminum foil?
You can use aluminum foil or any sort of metal for the touch plate, if that's what you're asking. For the capacitor, you will have to use a premade one. They're cheap.
got a link?
Digikey is good, but they have a $25 minimum order. Radioshack should have it for a buck or so.
ok now I know I hate soldering.....theres got to be a easyer way
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