Microchip PIC Microcontroller Resources News and Projects

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2010-07-12T21:25:00.000+05:30

Electronic Products focuses on the new product and product technology needs of engineers designing today's electronic equipment and systems. From cover to cover, month after month, they provide the relevant, timely product and technology information today's engineers need to make informed buying and specification decisions.

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Howto Block a Port in Squid Proxy , Ubuntu Linux

2010-05-29T12:12:00.000+05:30

Here I show a small Squid Access Control technique for blocking a port for all users and open it for a selected user.

Open /etc/squid/squid.conf file by using
# vi /etc/squid/squid.conf

Locate your Access Control List (ACL) section and add configuration directive as shown below:

acl block_ port port 5050
http_access deny block_port
http_access allow all

The above directives will help you to block port 5050

If you wish to allow the above blocked port to a particular IP (192.168.0.101) try as follows:

acl block_port port 1234
acl no_block_port_ip src 192.168.0.101
http_access deny block_port !no_block_port_ip
http_access allow all

Save and Close the file

Restart squid proxy by using
# /etc/init.d/squid restart

Getting started with Arduino

2010-05-26T23:47:00.000+05:30

Here You can see a very good site for Arduino Open Hardware Starting

Chapter Zero
Chapter One
Chapter Two
Chapter Three
Chapter Four
Chapter Five
Chapter Six
Chapter Six Added
ChapterSeven
Chapter Eight

Get your free Subscription : Electronics Design

2010-05-03T18:01:00.000+05:30

Electronics Design is a great book for Electronics Engineers. It is also useful for Electronivcs Students and teachers. Digital and printed copy are freely Available. It Serves the technical information needs of electronic engineers and engineering managers responsible for the design and development of EOEM products and systems.

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Download Proteus 7.6 sp4

2010-02-26T22:17:00.000+05:30

I have seen a download link for Proteus 7.6 sp4. Thanks for sharing
Proteus is a very good software for electronics simulation and PCB design
If you like this software please purchase a Licensed copy
http://depositfiles.com/files/q1kzk3gie

How to Interface PIC16F877A / 18F452 with RS232C Serial Communication Using CCSC

2010-01-12T22:23:00.000+05:30

Communication between a Microcontroller and a Computer is not a big thing. Use a level converter in between Microcontroller and PC. You can test it using a proteus simulation or directly connect your hardware to PC and use Hiper Terminal for Testing

Here a Simple code for testing Serial Communication

        #include <16F877A.h>
        #DEVICE ADC=10
        #fuses HS,NOWDT,NOPROTECT,NOLVP
        #use delay(clock=20000000)
        #use rs232 (baud=9600,rcv=PIN_C7, xmit=PIN_C6)

        int count=0;

        void main()
        {
        while(1){

        //1 Sec Delay
        delay_ms(1000);

        //Increment Count
        count ++;
        if (count>60)
      { count=0;}

        //Send data to PC
        printf("\n\r Count Value: %d",count);
        }
        }

LED Operates Directly From AC

2009-10-13T21:57:00.003+05:30

Acriche is the world’s first semiconductor light source that operates directly from AC power without a converter. This makes it suitable for many residential and commercial lighting applications where the main source of available power is AC.

Operates on AC power without additional conversion circuitry

Operating Voltage: 100V, 110V, 220V, 230V

Long Life: over 35,000 hours

No converter loss = higher fixture efficacy

Operating frequency: 50/60 Hz

Available in warm white and pure white

Multiple package options

See Link

Electronic Engineering Video Blog

2009-08-03T21:20:00.002+05:30

http://www.alternatezone.com/eevblog/

Good Microcontroller Project Ideas

2009-08-03T21:11:00.003+05:30

See this site for Project Ideas in Microcontroller

Motors and Microcontrollers
Piezoelectric Sound Meter
Crystal Real Time Clock
Meat Thermometer with Predictive Filter
Marquee LED Array Display
USB Servo-Guided Water Squirter
Valentine's Day LED Heart
iPhone-Controlled R/C Car
Electroluminescent LCD Backlight Circuit
Digital Arithmetic with DIP Switches
Morse Code Decoder

Changig Blog

2009-02-10T19:45:00.003+05:30

My New articles in PIC Microcontoller will publish on My Native Blog

http://shibuvarkala.blogspot.com

Proteus implementation of RTC with ds1307 and Mikroc

Using EEprom in 16f877a using Mikroc etc

Proteus 7.2 SP6

2008-12-31T08:27:00.001+05:30

I have seen a copy of latest proteus here

http://rapidshare.com/files/175522462/Proteus_7.2_SP6.rar

PIC Microcontroller - Basic Circuit

2008-12-28T20:57:00.001+05:30

PIC 18F to RS232C using max232

2008-12-04T20:42:00.003+05:30

Using max232 we can interface 18F454,18f4550 and 16f877 to PC serial port. Here you can see a very good example

PIC Microcontroller Based RF remote control

2008-11-16T22:44:00.004+05:30

This is a 3 channel RF remote control project using pic microcontroller .The transmitter powered by 3V battery(coin size) range about 10 m. The RF transmitter module for this project is TLP434A(433.92MHz) which is an Small Wireless Transmitter is ideal for remote control projects or data transfers to a remote object.
See The Full Project here.

Repair Chinese Compact Fluorescent Lamps (CFL)

2008-11-15T18:12:00.005+05:30

If you can repair a Chinese CFL you can make a greater contribution to environment . Compact fluorescent lamps have some benefits over ordinary bulbs. It is lower power consumption (to 80%) and much longer lifetime (5 to 15 times).

Here you can see collection of circuit diagram and servicing tips for CFL.

Make your own Laser Rangefinder

2008-11-08T22:27:00.002+05:30

If you are interested in making your own laser rangefinder, You can see this link, it is very interesting . You can use any processor, laser and spinning mirror you want. See the attachment for a full sized schematic.

See Link

Difference between I2c and SPI

2008-10-29T23:46:00.000+05:30

Differences between SPI and I2C:

SPI supports full duplex communication with higher throughput than I2C. It is not limited to 8-bit words so you can send any message sizes with arbitrary content and purpose. The SPI interface does not require pull-up resistors, which translates to lower power consumption. However, I2C is simpler by having fewer lines which means fewer pins are required to interface to an IC. When communicating with more than one slave, I2C has the advantage of in-band addressing as opposed to have a chip select line for each slave. I2C also supports slave acknowledgment which means that you can be absolutely sure that you’re actually communicating with something. With SPI, a master can be sending data to nothing at all and have no way to know that. In general SPI is better suited for applications that deal with longer data streams and not just words like address locations. Mostly longer data streams exist in applications where you’re working with a digital signal processor or analog-to digital converter. For example, SPI would be perfect for playing back some audio stored in an eeprom and played through a digital to analog converter DAC. Moreover, since SPI can support significantly higher data rates comparing to I2C, mostly due to its duplex capability, it is far more suited for higher speed applications reaching tens of megahertz. And since there is no device addressing involved in SPI the protocol is a lot harder to use in multiple slave systems. This means when dealing with more than one node, generally I2C is the way to go.
SPI interface:

More details See

RTC (ds1307) Interface for PIC 16f877A

2008-10-14T22:20:00.002+05:30

I have tested a time operated switch with RTC 1307 and PIC 16f877A. You can replace the LED with a relay. If you dont have a battery at testing time yo must ground the PIN 3 of 1307. You can avoid the capacitors also, but must use the pullup resisters.

Build Your Own PIC 16F877A Project Board

2008-10-04T14:01:00.007+05:30

Finally we have tested the General purpose PIC 16F877A Project board. This has been archived under the supervision of Prof.Sunil.TT, Shri. Manoj, Shri Dabilulal and Hri Suresh are also participated in this project.

Features :

Connectors provided for PortA, PortB, PortC, PortD and PortE.
All Port Connectors having Vcc and Ground, No External power required for extension Boards.
Provision for connecting ICSP Programmer (you can see it in previous post).
One LED And One switch are provided for testing board with out external components.
Provided external wire soldering facility in all PORT lines, VCC and GND.

The following add on boards are tested

LCD board
Board with 8 LED
Board with 4 LEDs and 4 Switches.
Real Time Clock with RTC 1307 (I2C)
External EEPROM with 24C21 (I2C)
PWM LED dimming
L293 Motor Controller

All the programs are written in Mikroc 8.0 , Circuits and Programs will publish soon

Make Your Own PIC Programmer

2008-09-09T21:53:00.005+05:30

This is a very simple pic programmer thet you can make. Step-by-step instructions are available here

In my case it worked very smoothly, only problem arises is with programming software configuration.

That are very simple , it will make problem in Windows Vista.

First you have to set the Language to English in programming software (winpic800). Then you have to select Settings->Hardware and set jdm Programmer

Select correct device from Top right corner

All the other help is as per the site

Howto make a PCB in Home

2008-09-09T20:41:00.002+05:30

Howto make a PCB in Home

It is simple, Toner Transfer method

Materials and equipments required

1. Ordinary Iron Box
2. hacksaw or hacksaw blade
3. low cost hand drill
4. Copper clad sheet (Glass epoxy is best for this method, if possible don't use paper phenolic )
5. Ferric Chloride (100 gm can be used for making 250 boards)
6. ART PAPER (Glossy paper available in office stationary store)
7. Plastic tray
8. Computer and Laser Printer ( Optional)

Steps

1. Make a fresh print out of your PCB layout in ART PAPER using a Laser Printer
(Transfer it as earlier with in 2 to 3 hours)
2. Clean the PCB with metal scrapper which is available Kitchen
( Cleaning is very critical, so clean it as shiny as possible)
3. Dry the PCB with a cotton waste
4. Power on the Iron Box with maximum heat setting
5. Place the art paper over the PCB copper side (make sure no air bubble )
6. Place the Iron Box over the PCB copper side for 3 to 5 Minutes , press and make a little move(depends on Heat)
7. Remove the Iron Box and put the PCB in to water
8. Sock it well and remove carefully the paper
9. Now you can see the toner stick in to the copper and paper layer can remove separately.
10. Sock and remove all part of paper (small portions of paper make short circuit)
11. make a solution with 10 to 25 gm of Ferric Chloride and 1/2 Lit water
12. Put the PCB in the solution and make to and fro motion until all part of the excess copper will remove.
13. Now Your PCB is Ready for drilling.

1mm holes are suitable for resisters, IC, diode etc

I have made lot of PCBs with this method.
Expense for making minimum setup is PCB (1'x1') - Rs.150($4) Hand Drill Rs.120($3)
Ferric Chloride(150 gm) - Rs.120($3) , Art paper, Hacksaw , Plastic Tray Rs.120($3)
TOTAL Approx. Rs.500 ($12)

PIC16F877A For Beginners

2008-09-08T14:48:00.003+05:30

PIC16F877A is good for beginners, With almost all features which they need eg: i/o Ports, ADC, PWM, timers etc. In this blog I will tell you, how can you make a home setup for experimenting.

You need the following things

1. A computer with Serial Port and loaded with Windows98 or Windows XP (Old system is more better)

2. PIC16F877A ( only $5) or get it from microchip as sample

3. A 8Mhz or 20Mhz Cristal and 2Nos of 22pf or 33pf capacitors

4. One 7805 Regulator IC and a 9V Battery (See try to make a cheep power supply from old computers SMPS)

5. One breadboard

Now You can start