Interfacing of ADC to 8051

Interfacing of ADC to 8051

      ADC (Analog to Digital converter) forms a very essential part in many embedded  projects and this article is about interfacing an ADC to 8051 embedded controller. ADC0804 is the ADC used here and before going through the interfacing procedure, we must neatly understand how the ADC 0804 works.

Interfacing Seven Segment Display to 8051

Interfacing Seven Segment Display to 8051

        This article is about how to interface a seven segment LED display to an 8051 microcontroller. 7 segment LED display is very popular and it can display digits from 0 to 9 and quite a few characters like A, b, C, ., H, E, e, F, n, o,t,u,y, etc. Knowledge about how to interface a seven segment display to a microcontroller is very essential in designing embedded systems. A seven segment display consists of seven LEDs arranged in the form of a squarish ’8′ slightly inclined to the right and a single LED as the dot character. Different characters can be displayed by selectively glowing the required LED segments. Seven segment displays are of two types, common cathode and common anode. In common cathode type , the cathode of all LEDs are tied together to a single terminal which is usually labeled as ‘com‘ and the anode of all LEDs are left alone as individual pins labeled as a, b, c, d, e, f, g & h (or dot) . In common anode type, the anode of all LEDs are tied together as a single terminal and cathodes are left alone as individual pins. The pin out scheme and picture of a typical 7 segment LED display is shown in the image below.

Interfacing 16x2 LCD with 8051

Interfacing 16×2 LCD with 8051

       LCD display is an inevitable part in almost all embedded projects and this article is about interfacing 16×2 LCD with 8051 microcontroller. Many guys find it hard to interface LCD module with the 8051 but the fact is that if you learn it properly, its a very easy job and by knowing it you can easily design embedded projects like digital voltmeter / ammeter, digital clock, home automation displays, status indicator display, digital code locks, digital speedometer/ odometer, display for music players etc etc. Thoroughly going through this article will make you able to display any text (including the extended characters) on any part of the 16×2 display screen. In order to understand the interfacing first you have to know about the 16×2 LCD module.

Interfacing DC Motor to 8051

Interfacing DC Motor to 8051

       This article shows how to interface a DC motor to an 8051 microcontroller. Interfacing DC motor to 8051 forms an essential part in designing embedded robotic projects. A well designed 8051-DC motor system has essentially two parts. Firstly an 8051 with the required software to control the motor and secondly a suitable driver circuit. Most of the DC motors have power requirements well out of the reach of a microcontroller and more over the voltage spikes produced while reversing the direction of rotation could easily damage the microcontroller. So it is not wise to connect a DC motor directly to the microcontroller. The perfect solution is to use a motor driver circuit in between the microcontroller and the DC motor.

Beginning Embedded Electronics - 1.2

Lecture 1 - Background and Power Supply

Page 2

There are some down sides to a protection diode:

• All diodes have a voltage drop, meaning 9V on one side will drop to about 8.5V on the other. So your 9V wall wart just became 8.5V.
• Diodes have a current rating. If you try to suck 1A (1 amp) through a 0.1A (one hundred mili-amp) rated diode, the diode will quickly heat up and fail. For reverse protection, we recommend a 1A 1N4001 diode. These are dirt cheap and very common.

Beginning Embedded Electronics - 1.1

Lecture 1 - Background and Power Supply

Page 1

       This is a series of lectures written for those with mild electronics background (aka Sophomore in Electrical and Computer Engineering) to learn about the wild world of Embedded Electronics. I assume only that you know what electricity is and that you've touched an electrical component. Everything else is spelled out as much as possible. There is quite a lot here so take your time! It is also my intention to get book-hardened EE's students to put down the calculator and to plug in an LED. Remember, if it smokes, at least you learned what not to do next
time!

Anthropomimetic Machines - The Humanoid Robots

Anthropomimetic Machines

        The Robotics technology has become highly advanced to such a level that even people who have routine jobs [in industries] are replaced by robots. Though the initial cost of such robots may be high, the overall gain will be huge when compared to manual labour. To us, robots are just machines with two arms and two legs which are connected together by nuts and bolts.

Make You Own PCB

Learn To Make PCB Using Eagle + Photoshop

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Page 1 - Designing

Page 2 - Processing in Photoshop

Page 3 - Exposure

Exposure

      If everything is printed out correctly on the test page print it out to a transparency using a Laser printer to the maximum resolution, cut the PCBs from transparency and keep them in good condition until development. Your hands must be clear and you must don't tough it on top of traces.

       You will need:

• Exposure chamber with UV light 300W
• 2 pieces of glass 30x30cm, thickness 0.5mm
• Peridrol (from local pharmacy shop)
• Sparse Hydrochloric acid (form Super Market, used in baths)
• Plastic gloves
• UV Light sensitive boards
• Protective Laquer spray
• Drill with drill bits form 0.5mm to 3mm
• 2 plastic basins

Make You Own PCB

Learn To Make PCB Using Eagle + Photoshop

Page 2/3

Page 1 - Designing

Page 2 - Processing in Photoshop

Page 3 - Exposure

Processing in Photoshop

      Open Photoshop and click Open, find file BlinkLed.bmp and click Open, the program wil open the PCB you created using Eagle.

      As you can see the PCB traces are white and the empty space is black, that must be inverted because we want to print out the traces.

      To achieve this we use the Invert command, click on Image - Adjustments - Invert or use the shortcut keys CTRL+I on your keyboard.

Make You Own PCB

Learn To Make PCB Using Eagle + Photoshop

Page 1/3

     Making your own PCB's is a procedure that needs extreme care so the result become useful. Many times you faced up the challenge to print out your own PCB's many times or many different PCB's in one sheet. In this article we will discuss how you can do this combining common software tools. Also we will discuss hoe to print out PCB's from Elektor magazine along with your own custom made PCB in one transparency, after processing it using Photoshop CS for better results.

          The software tools you need are:

• Adobe Photoshop CS (image processing).
• Adobe Acrobat Reader (PDF files reader).
• Eagle Layout Editor 4.11 Freeware (available at their website)

Page 1 - Designing

Page 2 - Processing in Photoshop

Page 3 - Exposure

ISDN Cause Codes

Cause codes of ISDN and there Effects

• Cause No.1
• Cause No.2
• etc

I2C Protocol Implementation With RTC And EEPROM

     The main aim of the project is to implement the I2C protocol by interfacing RTC and EEPROM using controller (ATmega8535).

ISDN Tutorials

1.       Overview

ISDN is a digital communication networks providing transmission rates in multiples of 64 kbits/sec. Typically described as 2B+D, Basic Rate Interface(BRI) logically used 2 64kbit/s data channels (B channels) and one 16kbit/s signaling channel (D channel). ISDN has yet to become a single global standard. Individual countries however, have their own flavors of ISDN all of which are based to a varying degree around the ITUs ISDN standard.

Introduction to Bluetooth

Bluetooth

Mobile Satellite System

Spread Spectrum

Introduction to RADAR System