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Design and Development of 89C51 Microcontroller Based Infrared Remote Control system

Posted by: seminar class
Created at: Wednesday 30th of March 2011 05:29:41 AM
Last Edited Or Replied at :Saturday 30th of April 2011 03:30:52 PM
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onent that is often controlled by digital protocols like I²C and SPI, as well as more basic Up/Down protocols.
 Some typical uses of digital potentiometers are in circuits requiring gain control of amplifiers (frequently instrumentation amplifiers), small-signal audio-balancing, and offset adjustment.
 Some Digipots come with non-volatile memory, so that they retain their last programmed position after they have been power cycled. Most, though, are volatile, i.e. after they are power cycled they will default to a standard value, which is usually the mid-point.
HARDWARE DEVELOPMENT..................[:=> Show Contents <=:]


Posted by: seminar class
Created at: Wednesday 09th of March 2011 05:23:56 AM
Last Edited Or Replied at :Thursday 25th of August 2011 11:36:28 PM
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to the microcontroller and
the microcontroller will translate the signals and determine if the input is within the
preset range. For instance, if the preset temperature range is from 20oC to 25oC, the
microcontroller will make sure that the greenhouse temperature is within this range. If the
temperature exceeds the maximum value, the microcontroller will then turn on the fan. If
the temperature drops below the minimum value, the heater will turn on. As for the
photodiode, if the greenhouse is exposed to insufficient light, it will send a signal to the
microcontroller. The microcontrolle..................[:=> Show Contents <=:]

Green house monitoring using zigbee

Posted by: seminar class
Created at: Monday 07th of March 2011 01:30:09 AM
Last Edited Or Replied at :Monday 07th of March 2011 01:30:09 AM
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control networks . While other wireless standards are concerned with exchanging large amounts of data, Zigbee is for devices that have smaller throughout needs. The other driving factors are low cost, high reliability, high security, low battery usage, simplicity and interoperability with other Zigbee devices. Compared to other wireless protocols, Zigbee wireless protocol offers low complexity. It also offers three frequency bands of operation along with a number of network configurations and optional security capability. It requires a supply voltage in the range of 2.8V to 3.3V.
Functio..................[:=> Show Contents <=:]


Posted by: projectsofme
Created at: Friday 26th of November 2010 12:59:42 AM
Last Edited Or Replied at :Friday 03rd of February 2012 10:43:13 PM
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l from DTMF receiver MT8870. The functions of corresponding switches (S1 through S8) and cell phone keys are shown in table I.

The DTMF decoder is used for decoding the mobile signal. It gets DTMF tone from the mobile headset’s speaker pins and decodes it into 4 bit digital signal. The DTMF decoder is operated with a 3.579 MHz crystal (XTAL2). In DTMF receiver MT8870 (IC3), capacitor C12 is used to filter the noise and resistors R6 and R7 help to amplify the input signal using the internal amplifier.
Pin 16 of IC3 connected to resistor R5 provides the early steering output. It goes hig..................[:=> Show Contents <=:]

speed control of moving vechiles using speed cameras

Posted by: vasu bajaj
Created at: Sunday 28th of March 2010 07:09:29 AM
Last Edited Or Replied at :Friday 02nd of April 2010 03:14:36 AM
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i want full report,presentation and abstra..................[:=> Show Contents <=:]

Remote control using VHF modules

Posted by: computer science crazy
Created at: Wednesday 09th of September 2009 02:01:30 AM
Last Edited Or Replied at :Wednesday 09th of September 2009 02:01:30 AM
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. The following circuits, using VG40R remote control receiver module measuring 45 mm x 21 mm x 13 mm, can be used to:
(a) activate a relay momentarily,
(b) activate a relay for a preset period,
(c) switch on and switch off a load.
To activate a relay momentarily (see Fig. 2), the switch on the transmitter unit is pressed, and so a positive voltage is obtained at output pin of VG40R module. This voltage is given to bias the relay driver transistor. The relay gets activated by just pressing push-to-on micro ..................[:=> Show Contents <=:]

Ultrasonics and Acousto-Optics for the Nondestructive Testing of Complex Materials

Posted by: Computer Science Clay
Created at: Saturday 06th of June 2009 10:55:36 PM
Last Edited Or Replied at :Thursday 27th of August 2009 06:56:57 PM
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, the propagation of ultrasound in piezoelectric materials that are subject to a pre-stress, and diffraction phenomena on 1D and 2D corrugated surfaces...................[:=> Show Contents <=:]

Selective Catalytic Reduction SCR

Posted by: computer science crazy
Created at: Tuesday 07th of April 2009 11:58:25 AM
Last Edited Or Replied at :Tuesday 07th of April 2009 11:58:25 AM
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erature window, and for OEM installations the Engine Control Unit is specially programmed to keep the exhaust gas temperature in that range..................[:=> Show Contents <=:]

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