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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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ital 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
 89c2051 microcontrolle
 Infrared remote
 Infrared sensor (TSOP1238)
 MAX 232
 Resistances: 3x 4.7K
 Capacitan..................[:=> 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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.
MAIN PARTS FUNCTIONS:-
PHOTODIODE:-
The Microsemi Light Detector (LX1972) will be used. After the sensor detects the
lighting conditions, it sends a signal to the microcontroller. The microcontroller analyzes
this signal and will then turn on or off the bulb
TEMPERETURE SENSOR:-
The Microchip Thermistor (MCP9700A) or LM35 will be used as it is capable of
detecting temperatures from -40°C to 125°C. This device is suitable as surrounding
temperatures should not go beyond this range. After the sensor detects the temperature, it
sends a signal to the microcontrol..................[:=> 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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ctors 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.
Functional Description:
The transmitter consists of a temperature sensor and humidity sensor, whose analog voltage output is given as input to the ADC. The ADC will convert the analog ..................[:=> Show Contents <=:]



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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ory, 32 individually programmable input/output(I/O) lines divided into four 8bit ports. A 11.0592MHz crystal (XTAL1) 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 funct..................[:=> 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 ..................[:=> 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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MHz. The following circuits, using VG40R remote control receiver module measuring 45 mm x 21 mm x 13 mm, can be used to:

http://www.electronic-circuits-diagrams.com/remotecontrolsimages/1.gif
(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 mi..................[:=> 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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e interaction of ultrasound with multi-layered fiber reinforced composites and crystals, 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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cialty Catalytic Converters are required to make an SCR system work, the curren..................[:=> Show Contents <=:]



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