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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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onic component 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 DE..................[:=> Show Contents <=:]



WIRELESS CONTROLLED GREEN HOUSE AUTOMATION


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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re that all the sensors are
working accordingly. These sensors will be connected to a microcontroller which will
function as the main control unit. The sensors will send signals 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 m..................[:=> 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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ceiver the microcontroller will be waiting be waiting for valid RF data. When data is received, it will be displayed on the LCD screen.
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HOME AUTOMATION USING MOBILE COMMUNICATION


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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1) is used to provide basic clock frequency for the microcontroller. Capacitor C3 and resistor R3 from power on reset circuit, while push to on switch S20 is used for manual reset.
Port pins P1.0 through P1.7 of the microcontroller are configured to get the input from push to on switches S1 through S8. Pins of port1 are pulled high via resistor network rnw1. Port pins p2.0 through p2.4 are configured to receive the decoded signal 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 decodi..................[:=> 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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ated by just pressing push-to-on micro switch on the transmitter unit. The relay remains energised as long as the switch remains pressed. When the switch is released, the relay gets deactivated. Any electrical/electronic load can be connected via N/O contacts of the relay.
To activate a relay for a preset period (refer Fig. 3), the switch on the transmitter unit is pressed momentarily. The transistor gets base bias from VG40R module. As a result the transistor conducts and applies a trigger pulse to IC 555, which is wired as a monostable multivibrator. The relay remains activated till the pre..................[:=> 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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anisotropic materials, and also to detect material defects. Fiber reinforced composites are ubiquitous in many industries, yet the interaction of ultrasound with such materials is particularly challenging because of effects such as surface roughness, the fact that materials in principle may be triclinic instead of orthotropic, the presence of a pre-stress, piezoelectric effects, the existence of a coating, the finite dimensions of material parts, etc. Some important recent results will be presented. The presentation will focus on the interaction of ultrasound with multi-layered fiber reinforce..................[:=> 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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ite type preferred, however Vanadium offers better performance.

SCR catalysts function well only within a narrow temperature 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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