Simple Remote Control Tester

REMOTE CONTROLS are used everywhere these days. It’s making life of us simpler.

Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor.

The most common wireless technologies use electromagnetic wireless telecommunications, such as radio. With radio waves distances can be short, such as a few meters for television remote control, or as far as thousands or even millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mice, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones.

4) The Socket API

The Socket API is the most widely used interface to write applications on the internet.

Network-Application Interface:• Defines how apps use the network
– Lets apps talk to each other via hosts; hides the details of the network

Digital Visitor Counter with 8085 Microprocessor

Digital visitor counter is a reliable circuit that takes over the task of counting Number of Persons/ Visitors in the Room very accurately. When anybody enters into the Room then the Counter is Incremented by one and when any one leaves the room then the Counter is Decremented by One. The total number of Persons inside the Room is displayed on the seven segment displays.

The microprocessor do the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in the Memory. The sensors are made with help of LDRs which are Light Dependent Resistors, whose Resistance is inversely proportional to the Light falling on it. The Laser Torch is used as the Light source and it is focused on the LDRs, the Microprocessor continuously watches the LDRs. 

Automatic Night Lamp with Morning Alarm using 8085 Microprocessor

This Project “Automatic Night Lamp with Morning Alarm” was developed using Microprocessor. 

It is the Heart of the system. The sensors are made with help of LDR which are Light Dependent Resistors, whose Resistance is inversely proportional to the Light falling on it. The LDR converts the light energy into electrical energy and this variable electrical energy was converted into digital signal (0 or 1) by using the timer IC555. 

The Timer IC output goes low when light falls on the LDR and the timer IC output goes high when the LDR was placed in dark. 

3) Network Components

Parts of a Network:

Consists of various nodes applications or in direct way we can say :

Computer Networks

Week 1: Introduction, Protocols, and Layering 

• 1-1 Goals & Motivation
• 1-2 Uses of Networks
• 1-3 Network Components
• 1-4 Sockets

2) Uses of Networks

Example Uses of Networks:

• Work:
– Email, file sharing, printing, …
• Home:
– Movies / songs, news, calls / video / messaging, e-commerce, …
• Mobile:
– Calls / texts, games, videos, maps, information access …

1) Goals & Motivation

Focus of The Course:

• Three Networking Topics :

FM Bug Transmitter

FM Bug Transmitter with a range of 20 to 50 meters

• Introduction

The goal of this project is to learn a little more about fm transmitters and fm bug making. The ideal outcome of this project is a very small. In order to be able to build this, we'll have to learn a lot about amplifiers, LC oscillators, mixers, antennas and FM. The success of this FM BUG is the use of THREE transistors in the circuit. To create a good design each transistor should be required to perform only one task. In any type of transmitter, there is a minimum of two tasks. One is to amplify the signal from the microphone and the other is to provide a high frequency oscillator. The amplified microphone signal is injected into the oscillator to modify its frequency and thus produce a FREQUENCY MODULATED oscillator. If an aerial is connected to the output of the oscillator, some of the energy will be radiated into the atmosphere. To increase the output of our design, an RF amplifier is used which is used as the buffer stage.In simple terms, an RF amplifier becomes a LINEAR amplifier.  We have opted for sensitivity and the first transistor is employed as a pre-amplifier. This will enable you to pick up very low-level sounds and transmit them about 20 to 50 meters.