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  1. D

    Suggest me a solution for a sms access door system project

    hi all , i am doing a sms access door system project and i nid something like a door sensor to sense if the door is closed properly or something.anybody have any information that u could provide?thanks.
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    Looking for a smoke sensor circuit

    Re: smoke sensor hey joby, thanks for that. but my smoke detector required to be controlled by 8051.Do u have any idea on how i could do that?
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    Looking for a smoke sensor circuit

    Re: smoke sensor oh okie thanks anyway.the motion sensor circuit u sent me looks complicated =(( . ahah.
  4. D

    Looking for a smoke sensor circuit

    Re: smoke sensor ohh thanks for your reply.Do you have a circuit design for that?it will help me alot if you happen to have it. (=
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    Looking for a motion sensor circuit

    hi all, anybody have the circuit for motion sensor?please share with me thanks.
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    Looking for a smoke sensor circuit

    hey all. anyone have smoke sensor circuit that you can share with me?(=. thanks
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    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system erm , for 8051 , the pin must be change to push - pull port so that when u give a 1 , it will output 3.3v and when u give a 0 , it will output 0 volt.
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    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system haha. thanks for reply.i manage to solve the problem already.thanks anyway (: . by the way, i nid 12 v. i have to change the value of the resistor and the transistor right?
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    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system hey.. 8051 give a 3.3 volt.if i use direct power of 3.3 volt from the power supply , it can work.but when i use 8051 to give a high, it doesnt work.the circuit is working properly, i think the main part is on the 8051 part.
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    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system oh sorry . haha. https://gamma.octopart.com/Fujitsu__RY-5WFZ-K.pdf hey , i tried with a led instead of the relay. the led can light up but it cannot be controlled by 8051.
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    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system thanks for reply.can i use 2N4307?Because my school dont provide 2n2222 , but there is 2n4307. Added after 2 hours 5 minutes: erm mine teacher ask me test with relay RY5WFZ-K , instead of the magnetic lock.how do i connect the relay?pin 1 and 16?and from the power...
  12. D

    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system thanks for ur reply .the magnetic lock require 12-24 v and around 450ma of current.
  13. D

    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system thanks for ur reply.(: The magnetic door lock nid 12v - 24v .8051 give only 3.3v but i nid 12v.how do i increase the voltage?is there any circuit that can be use in this situation?
  14. D

    Help me build a magnetic door system controlled by 8051

    Re: Magnetic door system Thanks for ur reply , but i am required to use micro processor 8051 to control the magnetic lock to energised or de-energise. i cannot use the ATMEL 89C52 that u mentioned. :(
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    Help me build a magnetic door system controlled by 8051

    hi all , I have encounted problems in building up the magnetic lock device circuit, controlled by 8051.plz enlighten me if anyone know. thanks

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