DIGITAL IC TESTER USING MICROCONTROLLER

PROJECT MEMBERS:

Y.V.G. KIRAN KUMAR(Team Leader)K.MURALI KRISHNAK.RAM TEJAD.SEKHAR BABU

PROJECT GUIDE:

Mr. G.N.V. RATHNA KISHORE

ABSTRACT

This “DIGITAL IC TESTER” is used to test the given ICs.

Components used:1.ATMEGA16 MCU2.KEYPAD3.LCD4.ZIF

ADVANTAGES:1.Low cost2.High Flexibility

TOOLS USED

TOOL USE

USBASP PROGRAMMER

AVR-GCC C COMPILER

AVRDUDE DUMPING SOFTWARE

FTDI232(USB TO SERIAL CONVERTER) DEBUGGING

MAKE `

CIRCUIT DIAGRAM

WORKING:

The IC to be tested is inserted in the base.

User enters the IC number through keypad.

IC number is communicated to the MCU.

Result is again communicated to the MCU.

If the IC tested is ok “IC TESTED OK is displayed on the LCD. Otherwise “IC TESTED FAILED” is displayed.

LCD DISPLAY16x2

1 2 3

4 5 6

7 8 9

* 0 #

MICROCONTROLLERZIF

SOCKET

POWER SUPPLY

BLOCK DIAGRAM

16X2 LCD display

PIN DESCRIPTION OF LCDFunction Pin

NumberName Logic State Description

Ground 1 Vss - 0VPower supply 2 Vdd - +5V

Contrast 3 Vee - 0 - Vdd

Control of operating

4 RS 01

D0 – D7 are interpreted as commands

D0 – D7 are interpreted as data

5 R/W 01

Write data (from controller to LCD)

Read data (from LCD to controller)

6 E 01

From 1 to 0

Access to LCD disabledNormal operating

Data/commands are transferred to LCD

Data / commands

7 D0 0/1 Bit 0 LSB8 D1 0/1 Bit 19 D2 0/1 Bit 2

10 D3 0/1 Bit 311 D4 0/1 Bit 412 D5 0/1 Bit 513 D6 0/1 Bit 614 D7 0/1 Bit 7 MSB

FUNCTIONS USED IN LCD LIBRARY FUNCTION DESCRIPTION

LCD_INIT(UINT8_T DISPATTR); CLEAR DISPLAY AND SET CURSOR TO HOME POSITION LCD_CLRSCR(VOID); SET CURSOR TO HOME POSITION

LCD_HOME(VOID); SET CURSOR TO SPECIFIED POSITION

LCD_GOTOXY(UINT8_T X, UINT8_T Y); DISPLAY CHARACTER AT CURRENT CURSOR POSITION LCD_PUTC(CHAR C); DISPLAY STRING WITHOUT AUTO

LINEFEED LCD_PUTS(CONST CHAR *S); DISPLAY STRING FROM PROGRAM MEMORY WITHOUT AUTO LINEFEED LCD_PUTS_P(CONST CHAR *PROGMEM_S); SEND LCD CONTROLLER

INSTRUCTION COMMAND LCD_COMMAND(UINT8_T CMD); SEND DATA BYTE TO LCD

CONTROLLER LCD_DATA(UINT8_T DATA); MACROS FOR AUTOMATICALLY

STORING STRING CONSTANT IN PROGRAM MEMORY

4X3 MATRIX KEYPAD

KEY DESCRIPTION OF 4X3 MATRIX KEYPAD

KEY RETURN NUMBER USED AS 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9 * 10 DELETE 0 11 0 # 12 ENTER

ZIF

Used to hold the IC which is To be tested.

MICROCONTROLLER(ATMEGA 1 6)

ZIF socket right side

ZIF socket left side

Keyboard

LCD

Pin Diagram:

Block diagram of ATMEGA16

MICRO-CONTROLLER………….FEATURES:

High-performance, Low-power AVR 8-bit Microcontroller.

32 x 8 General Purpose Working Registers.

16K Bytes of In-System Self-programmable Flash program memory.

512 Bytes EEPROM.

1K Byte Internal SRAM.

Up to 16 MIPS Throughput at 16 MHz

CONTD…………

Two 8-bit Timer/Counters & One 16-bit Timer/Counter.

Programmable Serial USART.

Master/Slave SPI Serial Interface.

Programmable Watchdog Timer with Separate On-chip Oscillator.

2.7 - 5.5V for ATmega16A.

INITIALIZE VARIABLES

READ IC NUMBER FROM KEYPAD

ISKNOWN

IC

LOAD THE TRUTH TABLE

SHOW ERROR MESSAGE

VERIFY TRUTH TABLE

SHOW “IC NOT WORKING”

SHOW “IC WORKING”

RESET

NO

YES

NO

YES

PROBLEMS FACED

We first started the project with ATMEGA168.But after analyzing its architecture we came to know that the I/O ports of this MCU are not sufficient for our project. Then we shifted to another MCU ATMEGA16.

At first we used a variable to store the IC number. But it is not storing the number correctly. Then we used array to store the IC number.

Finally…………..

SO FAR…………

We did the basic circuit on breadboard and Tried with few basic ICs on it. We developed the circuit on PCB and tested with those ICs that are previously tested on bread board.