Internet Of Things Blog

Click Here For Character LCD Basics   Lcd Library The mikroC PRO for 8051 provides a library for communication with Lcds (with HD44780 compliant controllers) through the 4-bit interface. An example of Lcd connections is given on the schematic at the bottom of this page. For creating a set of custom Lcd characters use Lcd Custom Character Tool. External dependencies of Lcd Library The following variables must be defined in all projects using Lcd Library : Description : Example : extern sfr sbit LCD_RS: Register Select line. sbit LCD_RS at P2_0_bit; extern sfr sbit LCD_EN: Enable line. sbit LCD_EN at P2_1_bit; extern sfr sbit LCD_D7; Data 7 line. sbit LCD_D7 at P2_5_bit; extern sfr sbit LCD_D6; Data 6 line. sbit LCD_D6 at P2_4_bit; extern sfr sbit LCD_D5; Data 5 line. sbit LCD_D5 at P2_3_bit; extern sfr sbit LCD_D4; Data 4 line. sbit LCD_D4 at P2_2_bi...

  Circuit Electronic voting machine has now replaced the traditional mechanism of voting due to several advantages like security, automatic counting etc. This project presents a way to develop an electronic voting machine which displays the count of votes on a 16x2 LCD interface. A user can get his/her vote register through a set of switches (one for each candidate). After every cast of vote, the subsequent count can be seen on LCD. The circuit uses AT89C51 microcontroller and the code for the project has been written in C. This LCD based electronic voting machine is designed for four candidates. The input part consists of a set of six tactile switches. The switches and 16x2 LCD are interfaced to microcontroller AT89C51 for various operations and displays. The provision of casting votes for the candidates has been provided through four of these switches. These switches are made active high and connected to pins 2-5 (P1^1 – P1^4) of the controller. The remaining ...

Introduction The hardware configuration when using multiple 1-Wire temperature sensors like the DS1820 is very simple, as illustrated in the block diagram below. A single-wire bus is used for communication between the microcontroller and the temperature sensor. It is also possible to power the devices direclty via this 1-Wire bus. An almost unlimited number of 1-WireTM devices can be connected to the bus because each device has a unique 64-bit ROM code identifier which is used to address each sensor   Temperature measurement using DS1820 sensor. Use of ‘1-wire’ protocol... Temperature measurement is one of the most common tasks performed by the microcontroller. A DS1820 sensor is used for measurement here. It is capable of measuring temperature in the range of -55 °C to 125 °C with 0.5 °C accuracy. For the purpose of transferring data to the microcontroller, a special type of serial communication called 1-wire is used. Due to a simple and wide use of these sensors, command...