ee-100 engineering laboratory module3: pcb

EE-100 Engineering LaboratoryModule1: PCB

Dr. –Ing. Ahmad Kamal Nasir[Office Hours]

Tuesday (1000-1100)Friday (1000-1100)

Room 9-345A (EE Dept. Right Wing)

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WEEK1Module 1

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PCB Module

• Week 1– Introduction to basic electronics components – Introduction to conventional/non-conventional PCB fabrication– Lab Visit: Overview of workshop facilities– Demonstration of etching and soldering– Demonstration of PCB CNC milling and drilling

• Week 2– Introduction to Proteus ISIS– Introduction to circuit schematic design and simulation– Tutorials: Create computer schematic and simulate circuit– Lab Task 2: Create schematic drawing in Proteus ISIS

• Week 3– Introduction to Proteus ARES– Introduction to circuit layout design– Tutorials: Create computer PCB layout for electronic circuits– Lab Task 3: Create Layout drawing in Proteus ARES

• Week 4– Lab Task 4: PCB Soldering and Troubleshooting

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Reference

• Design and Technology

– James Garratt

– 2nd Edition

– Cambridge Edition

• Chapter 6

Control electrics and electronics

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ELECTRONICS BASICS (REVIEW)

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Voltage/Current Measurements

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Resistor

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Resistor Color Code

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Voltage Divider

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Variable Resistor

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Light Dependent Resistor (LDR)

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Thermistor

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Lab Task 1(a)

• Sketch the graph of 𝑉𝑜𝑢𝑡against intensity?

• Sketch the graph of 𝑉𝑜𝑢𝑡against intensity if the position of resistor R and LDR swapped?

• Redesign the value of the resistor such that 𝑉𝑜𝑢𝑡 = 1𝑉at a light intensity of 1 Lux?

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The following circuit is used in a mobile robot to detect the amount of light present in the environment. The circuit uses a LDR as light sensor. Answer the following questions using the information provided to you.

BAT110V

R110k

1.0

LDR

GND

Vout

Capacitor

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Diode

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Can we use a diode as voltage divider?

Light Emitting Diode (LED)

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Switches

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Transistor

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How much is the amplification?

𝜷 =𝑰𝒄𝑰𝒃

Base current flows, when the base is at-least0.7V (Silicon) higher then emitter voltage.

Relay

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What is the advantage of a relay over a transistor?

Relay Application

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Lab Task 1(b)

The relay in the circuit turns on when 50𝑚𝐴 of current flows through its coil. The transistor used in the circuit has 𝛽 = 100 and 𝑉𝑏 = 0.7𝑉

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• How much base current is required to turn on the transistor?

• At which voltage (𝑉𝑖𝑛)the motor will turned on, considering RB =2k2?

Vin

12

12V

12

RB

GND

10k

Timer 555

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Reference: Design and Technology, Page #149

Operational Amplifier (Op-Amp)

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Reference: Design and Technology, Page #140

Through-Hole/SMD Components

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V-

V+12

12V

3

2

1

411

R210k

R310k

R1

1k

FAN

GND

+tc25.00

THR

Lab Task 1(c)

The following circuit uses thermistor and an op-amp to control the temperature of a room. The fan is required to maintain the room temperature at 25°𝐶.

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• At what voltage (𝑉 +) the fan turns on?

• What is the value of resistance R1 required to just turn on the fan. The resistance of thermistor (RT1) is 10KΩ at the temperature of 25°𝐶?

PCB PROTOTYPINGCONVENTIONAL

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Bread Board

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Vero Board (Matrix/Strip)

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Reading Reference: Design & Technology Chapter 6

Single Layer PCB Prototyping Workflow

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Reading Reference: Design & Technology Chapter 6

PCB Nomenclature

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SMD Technology: Pick and Place Machine

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SMD Technology: Reflow Oven

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CONVENTIONAL PCB PROTOTYPING

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Print Outline for PCB Cutting

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Cut Butter Paper /Peel Off Sticker Side

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Print Layout using Laser Printer

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Negative Image of Printed Layout

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Cut/File PCB Board

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Transfer Layout Image on PCB

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Ink Transferred on PCB

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Use Hot Water and FeCl3

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Fecl3 and PCB Inside Etching Tank

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Add boiling water into the tank and stir the solution

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Exposed copper is being dissolved into FeCl3 solution

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Wash after Etching

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Use Petrol to remove Printer Ink from Etched PCB

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Hand Drilling

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Prepare Butter Paper for Silk Screen Printing

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Transfer Silk Screen on PCB

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Prepare Soldering Work Station

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Apply Soldering Paste and Embed Resistors

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Solder Component Legs

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Solder Components (Smaller to Bigger)

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Testing (Power Up)

NON-CONVENTIONAL PCBPROTOTYPING

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CNC Machine

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Create CAD/CAM Files

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Import PCB Outline/Tracks/Drill Layer into CNC Machine Software

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Create Drilling Marks and Milling Outlines

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Final Output

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Video Demonstration

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PCB MillingPCB Drilling

Lab Visit

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• Conventional PCB Prototyping

• Non-Conventional PCB Prototyping