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  1. [81]
    فلسطين والنضال
    فلسطين والنضال غير متواجد حالياً
    عضو شرف
    الصورة الرمزية فلسطين والنضال


    تاريخ التسجيل: Apr 2008
    المشاركات: 895

    وسام الشكر

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    Pot plant water tester Click here for the circuit diagram
    This simple device checks if their is water in a pot plant. You stick the two probes(paperclips)into the pot plant and if the LED lights, it means there is water in the pot plant.
    You need to adjust the 47k potentiometer to set the level at which the LED goes on.

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    سوف نقتلهم جميعا وسوف نشرب دمائهم في كاس انتفاضتنا وليكن نخبه الموت لنا ولهم ولتحيا فلسطين

  2. [82]
    فلسطين والنضال
    فلسطين والنضال غير متواجد حالياً
    عضو شرف
    الصورة الرمزية فلسطين والنضال


    تاريخ التسجيل: Apr 2008
    المشاركات: 895

    وسام الشكر

     وسام كبار الشخصيات

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    Radio Remote Control using DTMF Click here for the circuit diagram
    H ere is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals. Usually remote control circuits make use of infrared light to transmit control signals. Their use is thus limited to a very confined area and line-of-sight. However, this circuit makes use of radio frequency to transmit the control signals and hence it can be used for control from almost anywhere in the house. Here we make use of DTMF (dual-tone multi frequency) signals (used in telephones to dial the digits) as the control codes. The DTMF tones are used for frequency modulation of the carrier. At the receiver unit, these frequency modulated signals are intercepted to obtain DTMF tones at the speaker terminals. This DTMF signal is connected to a DTMF-to-BCD converter whose BCD output is used to switch-on and switch-off various electrical applicances (4 in this case). The remote control transmitter consists of DTMF generator and an FM transmitter circuit. For generating the DTMF frequencies, a dedicated IC UM91214B (which is used as a dialler IC in telephone instruments) is used here. This IC requires 3 volts for its operation. This is provided by a simple zener diode voltage regulator which converts 9 volts into 3 volts for use by this IC. For its time base, it requires a quartz crystal of 3.58 MHz which is easily available from electronic component shops. Pins 1 and 2 are used as chip select and DTMF mode select pins respectively. When the row and column pins (12 and 15) are shorted to each other, DTMF tones corresponding to digit 1 are output from its pin 7. Similarly, pins 13, 16 and 17 are additionally required to dial digits 2, 4 and 8. Rest of the pins of this IC may be left as they are. The output of IC1 is given to the input of this transmitter circuit which effectively frequency modulates the carrier and transmits it in the air. The carrier frequency is determined by coil L1 and trimmer capacitor VC1 (which may be adjusted for around 100MHz operation). An antenna of 10 to 15 cms (4 to 6 inches) length will be sufficient to provide adequate range. The antenna is also necessary because the transmitter unit has to be housed in a metallic cabinet to protect the frequency drift caused due to stray EM fields. Four key switches (DPST push-to-on spring loaded) are required to transmit the desired DTMF tones. The switches when pressed generate the specific tone pairs as well as provide power to the transmitter circuit simultaneously. This way when the transmitter unit is not in use it consumes no power at all and the battery lasts much longer. The receiver unit consists of an FM receiver (these days simple and inexpensive FM kits are readily available in the market which work exceptionally well), a DTMF-to-BCD converter and a flip-flop toggling latch section. The frequency modulated DTMF signals are received by the FM receiver and the output (DTMF tones) are fed to the dedicated IC KT3170 which is a DTMF-to-BCD converter. This IC when fed with the DTMF tones gives corresponding BCD output; for example, when digit 1 is pressed, the output is 0001 and when digit 4 is pressed the output is 0100. This IC also requires a 3.58MHz crystal for its operation. The tone input is connected to its pin 2 and the BCD outputs are taken from pins 11 to 14 respectively. These outputs are fed to 4 individual ‘D’ flip-flop latches which have been converted into toggle flip-flops built around two CD4013B ICs. Whenever a digit is pressed, the receiver decodes it and gives a clock pulse which is used to toggle the corresponding flip-flop to the alternate state. The flip-flop output is used to drive a relay which in turn can latch or unlatch any electrical appliance. We can upgrade the circuit to control as many as 12 channels since IC UM91214B can generates 12 DTMF tones. For this purpose some modification has to be done in receiver unit and also in between IC2 and toggle flip-flop section in the receiver. A 4-to-16 lines demultiplexer (IC 74154) has to be used and the number of toggle flip-flops have also to be increased to 12 from the existing 4

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    سوف نقتلهم جميعا وسوف نشرب دمائهم في كاس انتفاضتنا وليكن نخبه الموت لنا ولهم ولتحيا فلسطين

  3. [83]
    فلسطين والنضال
    فلسطين والنضال غير متواجد حالياً
    عضو شرف
    الصورة الرمزية فلسطين والنضال


    تاريخ التسجيل: Apr 2008
    المشاركات: 895

    وسام الشكر

     وسام كبار الشخصيات

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    Temperature Controller


    Wine doesn't like subzero temperatures, and during wintertime, my "winecellar" got pretty cold.
    There was an electric heating element, but the thermostat was broken, so it was either full burn or nothing.
    That's how the temperature monitor/controller came to be.
    It was an obvious task for a small processor and I've always wanted to test the Dallas temperature sensors.
    So, I designed this little device which could monitor the temperature and control the heater.
    It's based on an AT90S2313 and a Dallas DS1621 Digital Thermometer. The temperature is displayed on a dual 7-segment display, and two buttons are used for setting parameters. A high current relay switches the heating element.
    I used an AVR 2313 as it just the right number of pins for this task. Also, it's programmable in C, which makes things easier. An alternative would be the 1200, but I've got some bad experience with that.
    A 4 MHz ceramic resonator is used for clocking the 2313.
    The displays are common cathode displays. The segments of both displays are tied together and multiplexing is handled in software. Note that the decimal point segment also are used. More detail about this later.
    The power supply is straight forward. A single or double tap 9 V transformer with a rectifier circuit and a 5V voltage regulator. The rectified input to the regulator is also supplied as a drive voltage to the relay.
    The Dallas DS1621 chip interfaces to the 2313 using a I2C interface. This is a 2 wire bidirectional bus with a speed up to 400 kbps.
    Up to 8 DS1621 devices can be connected on the same I2C bus, but in this case there's only one device, so the address selector pins on the DS1621 is pulled low, giving it address 0 (well, 0x90 actually).
    Actually, the DS1621 has a thermostat output, which can be programmed to a certain temperature, but it's not used in this application.
    The relay needs about 40-50 mA and is driven by a standard NPN transistor.
    The two buttons are used to set the temperature where the relay should kick in. As the code is now, the relay will always be ON when the measured temperature < set temperature, but this could be changed (if you would want to control an air-condition f.i.)
    Normally, the display show the measured temperature. The left decimal point will toggle on/off to show that the system is "alive". The right decimal point show the state of the relay, on or off.
    A short press on either the UP or DOWN button, will display the set temperature for about 1 second. If the key is held down, the set temperature will be increased or decreased respectively.
    Pressing both keys at the same time gives access to two parameters :
    The first is the hysteresis (indicated by the middle segment in the left display being lit, the right display show the parameter value), which determines the relay switch points. For instance, if the hysteresis is set to 2, and the set temperature to 21 degrees, the relay will go ON at 19 degrees, and OFF at 23 degrees. This is to avoid a situation with an oscillating relay.
    The second parameter is the display duty-cyle (indicated by the bottom segment in the left display being lit, the right display show the parameter value). This controls the display multiplexing, and effectively determines the display brightness.
    Both these settings are stored and fetched from the in the EEPROM.

    A fun little construction and a good way to learn about the DS1621.
    Comments are always welcome at [email protected]

    View schematics
    Download C-code
    Click on each of the pictures to see in in a larger size.
    This is how the controller box look.
    It's a plastic box with a transparent (but slightly tinted) lid.
    The display is clearly visible, but to adjust the switch temp or other parameters, the lid have to be removed. This is easily done due to the "handles" on the plastic screws.


    An inside view of the controller. It's build on a standard 0.1" experimental board. The electronics doesn't generate much heat, but it's enough to keep the inside of the box about 15 degree Celcius above the ambient temperature.

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    سوف نقتلهم جميعا وسوف نشرب دمائهم في كاس انتفاضتنا وليكن نخبه الموت لنا ولهم ولتحيا فلسطين

  4. [84]
    فلسطين والنضال
    فلسطين والنضال غير متواجد حالياً
    عضو شرف
    الصورة الرمزية فلسطين والنضال


    تاريخ التسجيل: Apr 2008
    المشاركات: 895

    وسام الشكر

     وسام كبار الشخصيات

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    Countermeasures


    This is another project which fullfills a need. I once built a frequency counter using plain TTL chips. That was long before the CMOS HC versions, even before LS was available.
    It could measure up to 50 MHz and worked quite okay, but the TTL chips was extremely power hungry. I think there was about 20-25 TTL chips on that monster.
    Well, but the old counter is now somewhere in the shed, and as I now again needed a counter, I did a bit more modern design.
    It uses only 4 chips - 3 HC TTL's and an Atmel At90S2313 microcontroller. It has a 5 digit LED display plus one used as a band indicator. Even with the LED display, the current consumption is less than 50 mA.
    It counts up to at least 52 MHz. I couldn't find any signal source in the lab that could supply more than 52 MHz, so it may go a bit higher, but the fClock(typ) for the HC590 is about 35-40 MHz, so you shouldn't really count (no pun intended) on more.
    I got the idea from an article I saw on the net. I think it was a Circuit Cellar article. I had a look at the code, and it sounded like a quick and simple counter solution. I don't know what chips it used, as I never saw the schematic, but here's my implementation :

    The hi-tech frequency counter board

    Sneaking up behind.
    The schematic is quite straightforward. There are two major parts, the display multiplexing and the counter stage.
    A 8-bit "databus" is constructed from the lower 4 bits of PORTD and the upper 4 bits of PORTB on the 2313. This peculiar arrangement is necessary, as we need the OC1 output on PB3 for gating the counter stage.
    The displays are 3-digit 7-segment common-cathode displays. They are multiplexed by supplying the segment data from the databus, and selecting the current digit with a 'HC138 dataselector, which is controlled by 3 I/O lines from the 2313.
    The two 'HC590 counters are counting the input pulses and supplies the count to the 2313 on the databus. Each counter can be read separately using the OE_L and OE_H lines. The counters are cleared using the CLR signal. The counters are gated using the OC1 (Output Compare 1) signal from the 2313. By varying the duration of the gate time, the counter can be made autoranging, and handle a large frequency span.

    Click image to see a larger schematic.
    The software for the counter is written in C-code, as speed is not an issue. All high-speed handling is done by the external counters and the Timer1 in the 2313.
    The method of measuing a frequency is simple. First, the counters are enabled for 1 mS. If the count is larger than 4096 (4.096 MHz), the count is shown on the display, and a new count is made. If less that 4096, we can get better resolution with a larger gate time, so we try 10 mS. Again, if the count is larger than 4096 (409.6 KHz), the count is shown, otherwise we try 100mS, or down to 1 S.
    The range for each gate time is : Gate timeRange1 mS4.096 MHz - 40+ MHz10 mS409.6 kHz - 4.096 MHz100 mS40.96 kHz - 409.6 kHz1 S0 - 40.96 kHz
    The display multiplexing is handled by an interrupt routine running on Timer0 every 2 mS. Three global variables are used to control the displayed value, the decimal point and range indicator. The range indicator uses the segments A, G and D (top, middle and bottom) in the last display to indicate Hz, kHz and MHz.
    View schematics Download C-code

    0 Not allowed!




    سوف نقتلهم جميعا وسوف نشرب دمائهم في كاس انتفاضتنا وليكن نخبه الموت لنا ولهم ولتحيا فلسطين

  5. [85]
    فلسطين والنضال
    فلسطين والنضال غير متواجد حالياً
    عضو شرف
    الصورة الرمزية فلسطين والنضال


    تاريخ التسجيل: Apr 2008
    المشاركات: 895

    وسام الشكر

     وسام كبار الشخصيات

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    GSM/GPS Based Projects


      • Home security system using GSM
      • Home appliance control using GSM
      • Child monitoring using GSM + GPS
      • Offline Cargo Monitoring System using GPS
      • Article tracking system using GPS and GSM
      • GSM based data monitoring system
      • Remote Temperature Monitoring through GSM.
      • Intelligent TAXI metering Based on GPS
      • Car security System using GSM/ GSM+GPS.
      • GSM based Traffic density monitoring and control
      • GSM based Energy Meter.
      • GSM based bus tracking.
      • SMS reader for blind.
      • GSM based voting machine.
      • Mark Announcement System using GSM.
      • Remote Sales Terminal.
      • Remote Irrigation control and monitoring using GSM
      • Weather monitoring using GSM for hazardous areas.
      • Water reservoir monitoring and PUMP station control using GSM
      • Wild life monitoring and location indicators for visitors using GPS+GSM

    0 Not allowed!




    سوف نقتلهم جميعا وسوف نشرب دمائهم في كاس انتفاضتنا وليكن نخبه الموت لنا ولهم ولتحيا فلسطين

  6. [86]
    م.عزوز
    م.عزوز غير متواجد حالياً
    عضو


    تاريخ التسجيل: May 2006
    المشاركات: 24
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    Thumbs up شكرا على الموضوع ..,,..

    السلام عليكم ورحمة الله وبركاتة ,,,


    أخوي فلسطين والنضال ,, أشكرك على هذا الموضوع الذي بزيد ان شاء الله من العلم والمعرفة للشباب العربي ,,,


    بس ملاحظ انك تشتكي من قلة التفاعل ,, وهذا ان شاء الله راح يتغير مع دخول الأعضاء ,, والاطلاع على الأفكار المطروحة ,,


    من ناحيتي أنا ,, أود أن أشارك معكم بالذي أقدر علية ,,


    أنا أذكر بعض مواضيع التخرج لبعض الشباب ,, لكن المشكلة أني ماأمتلك صور ورسومات توضيحية لها ,,,


    لـــــــــــكـــــــــن أشاركم بموضوعي للتخرج

    Expert System In Powder Selection

    وهو بناء نظام خبرة لاختيار البودرة ,,

    وأي معلومات أو أي شئ ,,, ان شاء الله أقدر أفيدكم فيها ,,


    وأكرر شكري لجميع من ساهم باثرااء الموضوع ,,

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  7. [87]
    عراقية الاصل
    عراقية الاصل غير متواجد حالياً
    عضو متميز
    الصورة الرمزية عراقية الاصل


    تاريخ التسجيل: Feb 2008
    المشاركات: 1,160
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    السلام عليكم ماشاءالله عليك اخي المشرف فلسطين والنضال ......... اخي انا محتاجة فكرة لبحث في مجال الروبوتات وبالاخص في التصميم البرمجي للروبوتات .......؟؟ فهل لديك فكرة جميلة لكي اعمل بحث عليه robot vision
    جزاك الله خيرا وزادك الله علما

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  8. [88]
    النورس0
    النورس0 غير متواجد حالياً
    عضو


    تاريخ التسجيل: Jan 2009
    المشاركات: 31
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    ممكن مشروع تخرج دبلوم

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  9. [89]
    م.محمود جمال
    م.محمود جمال غير متواجد حالياً
    عضو متميز
    الصورة الرمزية م.محمود جمال


    تاريخ التسجيل: Jan 2006
    المشاركات: 1,136
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    thanksssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssss

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  10. [90]
    م.محمود جمال
    م.محمود جمال غير متواجد حالياً
    عضو متميز
    الصورة الرمزية م.محمود جمال


    تاريخ التسجيل: Jan 2006
    المشاركات: 1,136
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    اين مهندسى ميكانيكا

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