Interfacing 1. 6x. LCD with 8. 05. 1 microcontroller. LCD module theory, circuit diagram and program in assembly language. LCD display is an inevitable part in almost all embedded projects and this article is about interfacing a 1. LCD with 8. 05. 1 microcontroller. Many guys find it hard to interface LCD module with the 8. Thoroughly going through this article will make you able to display any text including the extended characters on any part of the 1. In order to understand the interfacing first you have to know about the 1. LCD module. 1. 62 LCD module. LCD module is a very common type of LCD module that is used in 8. Blog Entry Using Maxim DS1307 Real Time Clock with Atmel AVR Microcontroller May 11, 2009 by rwb, under Microcontroller. Building our own digital clock is one of the. Digital-Clock-using-PIC-Microcontroller-and-the-DS1307-Real-Time-Clock.jpg' alt='Ds1307 Programming' title='Ds1307 Programming' />Learn to design a Real Time Clock using 8051 micro controller and DS1307 RTC module. The program is written in Embedded C for Interfacing RTC to 8051. PICAXE Programming Editor 5 is the legacy software for programming, testing and simulating BASIC programs for PICAXE. Temperature logging sketch with SD card, webserver, I2C LCD and DS1307 RTC that syncs with timeserver. After publishing Arduino tutorials for over six years I have decided to take a break for a while. You can still see the index of remaining articles down the right. Ds1307 Programming' title='Ds1307 Programming' />This looks like itll be quite useful though a write function that doesnt take a registerAddress might be nice. Some homebrew I2C devices dont seem to use a. This is a nonexhaustive list of Arduino boards and compatible systems. It lists boards in these categories Released under the official Arduino name. Easily Learn about and create pic projects such as a Real Time Clock, an Ultrasonic rangefinder, a frequency counter, an 8x8 LED matrix driver, an RGB LED controller. Togaf 9.1 Pdf Download Free. Interfacing 16x2 alphanumeric LCD module with AT89S51 microcontroler. Circuit diagram,theory and program. JHD162 lcd module pinout and commands. This is going to be a easy tutorial for starting out with basic AVR programming, and also a reference collection so that it sits in one place on the site. It consists of 1. LCD dot matrices. The module were are talking about here is type number JHD1. A which is a very popular one. It is available in a 1. The pin numbers, their name and corresponding functions are shown in the table  below. Pin No Name  Function. VSSThis pin must be connected to the ground. VCC Positive supply voltage pin 5. V DC3. VEEContrast adjustment. RSRegister selection. RWRead or write. E Enable. DB0 Data. DB1 Data. DB2 Data. DB3 Data. DB4 Data. DB5 Data. DB6 Data. DB7 Data. LED Back light LED1. LED Back light LED VEE pin is meant for adjusting the contrast of the LCD display and the contrast can be adjusted by varying the voltage at this pin. This is done by connecting one end of a POT to the Vcc 5. V, other end to the Ground and connecting the center terminal wiper of of the POT to the VEE pin. See the circuit diagram for better understanding. The JHD1. 62. A has two built in registers namely data register and command register. Data register is for placing the data to be displayed, and the command register is to place the commands. The 1. 62 LCD module has a set of commands each meant for doing a particular job with the display. We will discuss in detail about the commands later. High logic at the RS pin will select the data register and  Low logic at the RS pin will select the command register. If we make the RS pin high and the put a data in the 8 bit data line DB0 to DB7, the LCD module will recognize it as a data to be displayed. If we make RS pin low and put a data on the data line, the module will recognize it as a command. RW pin is meant for selecting between read and write modes. High level at this pin enables read mode and low level at this pin enables write mode. E pin is for enabling the module. A high to low transition at this pin will enable the module. DB0 to DB7 are the data pins. The data to be displayed and the command  instructions are  placed on these pins. LED is the anode of the back light LED and this pin must be connected to Vcc through a suitable series current limiting resistor. LED is the cathode of the back light LED and this pin must be connected to ground. LCD module commands. LCD module has a set of preset command instructions. Each command will make the module to do a particular task. The commonly used commands and their function are given in  the  table below. Command                      Function. FLCD ON, Cursor ON, Cursor blinking ON0. Clear screen. 02. Return home. 04. Decrement cursor. Increment cursor. EDisplay ON ,Cursor blinking OFF8. Force cursor to the beginning of  1st line. C0. Force cursor to the beginning of 2nd line. Use 2 lines and 57 matrix. Cursor line 1 position 3. CActivate second line. Display OFF, Cursor OFFC1. Jump to second line, position. OCDisplay ON, Cursor OFFC1. Jump to second line, position. C2. Jump to second line, position. LCD initialization. The steps that has to be done for initializing the LCD display is given below and these steps are common for almost all applications. Send 3. 8H to the 8 bit data line for initialization. Send 0. FH for making LCD ON, cursor ON and cursor blinking ON. Msn 7.7 there. Send 0. 6H for incrementing cursor position. Send 0. 1H for clearing the display and return the cursor. Sending data to the LCD. The steps for sending data to the LCD module is given below. I have already said that the LCD module has pins namely RS, RW and E. It is the logic state of these pins that make the module to determine whether a given data input  is a command or data to be displayed. Make RW low. Make RS0 if data byte is a command and make RS1 if the data byte is a data to be displayed. Place data byte on the data register. Pulse E from high to low. Repeat above steps for sending another data. Circuit diagram. Interfacing 1. LCD module to 8. 05. The circuit diagram given above shows how to interface a 1. LCD module with AT8. S1 microcontroller. Capacitor C3, resistor R3 and push button switch S1 forms the reset circuitry. Ceramic capacitors C1,C2 and crystal X1 is related to the clock circuitry which produces the system clock frequency. P1. 0 to P1. 7 pins of the microcontroller is connected to the DB0 to DB7 pins of the module respectively and through this route the data goes to the LCD module. P3. 3, P3. 4 and P3. E, RW, RS pins of the microcontroller and through this route the control signals are transffered to the LCD module. Resistor R1 limits the current through the back light LED and so do the back light intensity. POT R2 is used for adjusting the contrast of the display. Program for interfacing LCD to 8. Program. MOV A,3. H Use 2 lines and 5x. MOV A,0. FH LCD ON, cursor ON, cursor blinking ON. MOV A,0. 1H Clear screen. MOV A,0. 6H Increment cursor. MOV A,8. 2H Cursor line one, position 2. MOV A,3. CH Activate second line. MOV A,0. C1. H Jump to second line, position 1. HERE SJMP HERE. Subroutine CMND sets the logic of the RS, RW, E pins of the LCD module so that the module recognizes the input data given to DB0 to DB7 as a command. Subroutine DISP sets the logic of the RS, RW, E pins of the module so that the module recognizes the input data as a data to be displayed. Interfacing LCD Module to 8. Bit Mode using only 4 pins of a portThe microcontroller like 8. GPIO pins GPIO general purpose input output. So to design complex projects we need sufficient number of IO pins. An LCD module can be interfaced with a microcontroller either in 8 bit mode as seen above or in 4 bit mode. RS, RW, E pins for functioning. However 4 bit mode uses only 4 data lines along with the control pins. This will saves the number of GPIO pins needed for other purpose. Objectives. Interface an LCD with 8. Use a single port of the microcontroller for both data and control lines of the LCD. LCD Module to 8. 05. Bit Mode. As shown in the circuit diagram, port 0 of the controller is used for interfacing it with LCD module. In 4 bit mode only 4 lines D4 D7, along with RS, RW and E pins are used. This will save us 4 pins of our controller which we might employ it for other purpose. Here we only need to write to the LCD module. So the RW pin can be ground it as shown in the schematic diagram. In this way the total number of pins can be reduced to 6. In 4 Bit mode the data bytes are split into two four bits and are transferred in the form of  a nibble. The data transmission to a LCD is performed by assigning logic states to the control pins RS and E. The reset circuit, oscillator circuit and power supply need to be provided for the proper working of the circuit. Program Interface LCD Module to 8. Bit Mode. RS EQU P0. MOV DPTR,INITCOMMANDS. MOV DPTR,LINE1. MOV DPTR,TEXT1. Pablo Escobar Daughter. MOV DPTR,LINE2. MOV DPTR,TEXT2. SPLITER MOV L,A. MOVE ANL PORT,0. F0. H. LCDDATA SETB RS. LCDDISP CLR A. ACALL LCDDATA. DELAY MOV R7, 1. H. L2 MOV R6,0. FH. L1 DJNZ R6, L1. INITCOMMANDS DB 2. H,2. 8H,0. CH,0. 1H,0. H,8. 0H,0. LINE1 DB 0.