Monday, June 20, 2011

CrazyEngineers Forum - Electrical & Electronics Engineering

CrazyEngineers Forum - Electrical & Electronics Engineering

Photoresistor to detect materials

Posted: 20 Jun 2011 02:33 AM PDT

Hi there, is anyone familiar with using Photo-resistors to detect material of an object, ex- Al, plastic, or paper. I'm under the impression that we'll have to do it together with RC time method, but that's all i got.
Or is there a better solution for detecting plastic, aluminum and paper? using one method to detect them all? I think we can use capacitive sensing as well, no?

Anybody with any ideas would be greatly appreciated! :)

Edge Trigger Code

Posted: 19 Jun 2011 09:18 AM PDT

hi every one..

i want to make a up-down counter using 8051..
two switches are connected with UC.
one for up counting and one for down counting..
now the problem is that if i press one switch only at once it count correctly but if
switch is not released then it will not count only for once.....it count continuosly untill the switch is released.
i want to make it edge triger mean if a switch is pressed it will count when switch is released. if switch is hold for long time ,it must have to count only once...

i need c code or any algorithem ..

i m using keil c compiler..

thnx

pcb designing at home

Posted: 19 Jun 2011 06:32 AM PDT

is it possible to design a printed circuit board(pcb) at home.if yes then what are the tools required??beside pcb layout software.
please also tell about their prices.thanks in advance.
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