Basics You must be knowing about Digital Integrated

Basics You must be knowing about Digital Integrated Circuits (ICs) right ? For example 7404: Hex Inverter 7408: Quad 2 -input AND gate 7410: Triple 3 -input NAND Gate 7432: Quad 2 -input OR Gate

Basics… �? Suppose you wish to make a circuit to ON/OFF your room light automatically depending on the intensity of light in your room. � What items are required…. a) Light intensity sensor (LDR). b) A comparator (a circuit of Opamp). c) Reference voltage. d) Digital gates. e) And lots of calibration will be required.

Basics…. . This circuit is going to be quite complicated. ? What if , I say you have to completely automate your home…only by using discrete circuits (? ? ? ). Here comes the role of Microcontroller/Microprocessor. Just by writing few lines of code you can do all the stuffs asked earlier. q

What is embedded system? � An embedded system is a computer system with a dedicated function. � Embedded systems contain processing cores that are either microcontrollers, or digital signal processors (DSP). � Examples - Watches, DVD player, Air conditioner, Washing Machine , Video games, Mobile phones etc.

Microcontrollers � It is an integrated circuit with certain no of pins that you can make any pin as output or input. Also you can change the function of that pin by programming the IC using your computer. � That’s what the most basic function of a microcontroller is. It has set of pins called as PORT and you can make any pin either as output or input.

Microcontrollers � After configuring pins you can program it to perform according to any function table you want. � You can change the configuration or the function table as many times as you wants. (Flexible)

Microcontrollers � There are many Semiconductor Companies which manufactures microcontrollers. Some of them are � Intel � Atmel (Atmega series) � Microchip � Motorola

Microcontroller ATMEGA 32/16 � Few of the imp features of ATMEGA 32/16 are. . ü 32 Programmable I/O Lines. ü 32 K/16 K Bytes of In-System Self. Programmable Flash Memory. ü 8 -channel, 10 -bit ADC.

softwares � Code vision AVR. � Atmel studio. � Eclipse. � Proteus (Simulator). Here we will be using code vision AVR for programming.

Instructions � DDRX – Data direction register � PORTX – Port X data register. � PINX – Data read register. If a pin is set to be input, then by setting its corresponding bit in PORTX register will make it as follows, � Set bit 0 ---> Tri-Stated � Set bit 1 ---> Pull Up � Delay. h , delay_ms(value);

LCD Instructions � lcd_clear() � lcd_gotoxy(x, y) c) lcd_putchar(‘H’) � lcd_putsf(constant string) lcd_putsf(“MNNIT”) � lcd_puts(char arr) � itoa(int val, char arr[]) � lcd_putchar(char

Basic Led program � Write a program to glow a LED using Atmega 32. � Now blink the LED with 100 ms delay. � Make a Pattern.

Alphanumeric LCD interface �? Print “Hello”. � ? Blink “Hello” pattern. � ? Print “Hello Friends Welcome to Embedded Class” ? Print Moving Name.

ADC interface � What is ADC ? � Reading ADC PORT. � Control some functions based on ADC.

How to set a pin to high impedance. � If a pin is set to be input, then by setting its corresponding bit in PORTX register will make it as follows, � � Set bit 0 ---> Tri-Stated � � Set bit 1 ---> Pull Up means the input will hang (no specific value) if no input voltage is specified on that pin. � Pull Up means input will go to +5 V if no input voltage is given on that pin. It is basically connecting PIN to +5 V through a 10 K Ohm resistance. � Tristated

Interfacing of 4 wire resistive Touchpad. � How it looks like

Internal Structure

Locating Coordinates

Graphical Lcd interface � 1 ) print name. � 2 ) print pictures. � 3 ) make animation.