Rs485 Serial Communication Between Arduino Mega and Arduino Pro Mini

In this project i will discuss about how to use Max485 for serial communication. How to effectively configure RS485 in Receive and Transmitt mode. What are advantages of using RS485 protocol for serial communication and finally i will present a working model of RS485 serial communication between arduino Mega and Arduino Pro Mini.

Rs485 Serial Communication protocol is capable of transmitting data to Maximum distance of 4000m or 4km. But normally after 1200km the signal starts droping off and eventually data starts lossing. To achieve 4 km successful data transmission the carrying medium should be smooth and the length of A and B lines should be equi-distance in length. External EMF(Electro Motive Force) also effects the lines carrying the data.

Rs485 Transmits two differential signals on A and B lines. Since signals are opposite in polarity(90 Degree out of Phase) they travel a well distance. Since the Signals are opposite in Polarity any external induced signal is easily filtered at the output. 

http://www.microcontroller-project.com/rs485-communication-between-arduino-mega-and-arduino-pro-mini.html

How to Use DC 0-100V 10A DIGITAL VOLTMETER AMMETER for Arduino and Example

Connection Diagram:

 

How to use TEC1-12706 12706 TEC Thermoelectric Cooler Peltier semiconductor refrigeration

How to use TEC1-12706 12706 TEC Thermoelectric Cooler Peltier semiconductor refrigeration

Product Description

Get cold or heat up by simply reversing the polarity, used for numerous applications from CPU coolers to alternate power sources, or even for your own custom car drink warmer/cooler.

• Model: TEC1-12706
• Size: 40mm x 40mm x 4mm
• Operates from 0~15.2V DC and 0~6A, in a good condition with heat sink, current will rise to 4A.
• Operates Temperature: -30℃ to 70℃
• Max power consumption: 60 Watts
• These devices must be used together with a heat sink to avoid burned in 2 seconds after powered up
• Each device is full inspected and tested
• Fitted with 6-inch insulated leads
• The side with words are the cooling side, and other side is the warm side.

This devices are also known as: TEC, Thermoelectric Cooler, Thermoelectric Module, Peltier Junction, Peltier Plate

Application: Cooling your CPU, video card, NANO Reef, laser diode, CCD camera, picnic cooler, beverage cooler, even generating electricity. The uses are unlimited!

how to make a environmental friendly portable air conditioner. This machine uses a Peltier Module as a cooling  mechanism and some cooling fans for blowing air.

http://www.instructables.com/id/Thermoelectric-Peltier-Air-Conditioner/

Buy TEC1-12706 @ Rs. 180 from iOpenLabs

info@evisions@fastservice.com 

How to connect LCD shield with arduino uno ?

You Learn:

How to connect LCD shield with arduino uno ?

This Kit includes:

************************

LCD SHIELD

ARDUINO UNO

USB cable

Cost of Kit:Rs.710

Contact: evisions@fastservice.com

info@iopenlabs.com

*************************

Put LCD  shield on arduino uno.

Program:

// include the library code:

#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {

  // set up the LCD's number of columns and rows:

  lcd.begin(16, 2);

  // Print a message to the LCD.

  lcd.print("iOpenLabs");

}

void loop() {

  // set the cursor to column 0, line 1

  // (note: line 1 is the second row, since counting begins with 0):

  lcd.setCursor(0, 1);

  // print the number of seconds since reset:

//lcd.print(millis()/1000);

}

Starting with Arduino Uno R3(Arduino UNO R3+ LCD Keyboard shield)

Arduino uno R3 is open source hardware platform using which we can develop lot of project for learning the embedded system programming. It is also very useful to make ITI, Diploma, B-tech and M-tech Project using Arduino Uno R3 development board. Even Arduino is very use full to do lot of experiment and learn the concept of electronics while making some useful working model and instruments. 

Do it you shelf Arduino Kits are very use full in process of learning by doing. There lot of things available with arduino uno to do and create sense of CS-STEM (computer science, Science, Technology, engineering and Mathematics) among students.

Arduino clone are available in Rs 500(7-8 $) with USB cable and it's function is very well. So in only 500 we have a computing platform using which we can do lot of experiment and learn embedded system programming for which most of training center charging lot of money.

We buy Arduino Uno R3,  we can do LED blink program and check that arduino is working. Next we can do lot of experiment using arduino if we have LCD Keyboard shield. LCD Keyboard shield is available in RS 350(3-4$). So it is good to buy Arduino uno +LCD Keyboard shield together. If we have LCD Keyboard Shield we can learn how to display something on LCD. LCD and Keyboard is mostly used add on with microcontroller in embedded system.    

Now if  we want to play with sensor and make some useful instruments that also require LCD shield.

When we plug LCD shield with a arduino and dump code in arduino board take care that code for LCD shield has same pin definition as it is connected on board other wise LCD shield will not display. If you are facing any problem in connecting LCD Keyboard shield with arduino you feel free to contact.