Day 2

Common lecture

The morning session began with the demonstration of speaker as a microphone, showing how a moving coil (attached to the diaphragm of the speaker) in a magnetic field could produce a voltage. Next, a dc motor was made to work as a generator and the generated voltage was used to power an LED. Then, an experiment showing the working of a Peltier module was shown. Peltier module is a thermocouple which responds to the voltage applied across it in the form of a temperature difference by making one side hot and the other side cold. On the other hand, in another experiment, a temperature difference applied across a peltier module was used to generate power.

Demo experiments:

Speaker as Mic

Response of a speaker working as a microphone recorded on an oscilloscope

Motor as Generator

Motor made to work as a generator to power up an LED

Heat to Voltage - Peltier

Heating of a peltier module to generate potential difference across its ends

Following this, an introductory talk on ‘Embedded System Design’ was given. It started with a discussion about ‘What are embedded systems and where are they found? Some examples of embedded systems being used at home like the refrigerator, AC, TV remote were discussed Following this, some observations were drawn, enlightening the participants about the size of the Embedded Systems Industry and microcontroller/microprocessors with the software’s running on them as the core of this entire system. It is estimated that for India alone, this industry requires an input of about 32 lakh crore rupees by 2020.

Then a comparison was drawn between ‘Embedded Systems’ and ‘Desktop Computers’, discussing each of them at levels like cost involved, reliability and accuracy constraints, task specifications, real time use, resources involved and programming needs.

A graph was plotted between ‘Probability of Failure’ and the ‘Age of a product’, which described how prone a product is to failure at various stages of its life span. This curve came to be known as the ‘Bath tub curve’.

Post Lunch – EAGLE CAD

This session was about using a CAD software named ‘EAGLE’ to make schematics and board layouts headed by Abhishek Kapoor and Arun Kumar (currently pursuing B.E., 7th semester, ECE division, NSIT). It stands for Easily Applicable Graphical Layout Editor. During this session, the participants were explained the various tools used to make a schematic diagram in EAGLE and as an exercise, the schematic diagram of a common emitter (CE) amplifier circuit was made and the code practice oscillator (CPO) circuit was given as homework for practice.

CE Amplifier Schematic

A CE amplifier schematic practiced during lecture

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