10-05-2012, 01:01 PM
DIGITAL IC TESTER
[attachment=21758]
INTRODUCTION
We completed our project by going through these steps,
•
We made a USB to Serial Programmer ,
•
We did the basic circuit on breadboard and Tried with few basic ICs on it.
•
We developed the circuit which can put on PCB and can be used for all the ICs.
•
To make the project user friendly, we worked to make the keypad and LCD interface.
WORKING:
The IC to be tested is inserted in the base. The user enters the IC number through keypad which is simultaneously displayed on the LCD. The IC number is communicated to other MCU which basically test the ICs for few sets of input which is given through the MCU and corresponding output. The result is again communicated to the first MCU confirming it to be either correct or faulty which is displayed on the LCD.If the IC tested is ok “IC TESTED OK is displayed on the LCD.Otherwise “IC TESTED FAILED” is displayed.
For example if we want to check shift register(74194) the following steps has to be followed
if IC is ok,”IC TESTED OK” is displayed on the screen otherwise “IC TESTING FAILED” is displayed.
We also have the reset key.If by mistake a wrong IC number is typed,it can be reseted using the reset key and then correct IC number can be typed.
Fig. Block Diagram
ATMEGA 16
LCD
IC to be tested
A TMEGA 1 6
III.
ICs THAT CAN BE TESTED
•
4069-Hex Inverter (NOT Gate)
•
4081- Quad 2-Input AND Gate
•
4071- Quad 2-Input OR Gate
•
4001- Quad 2-Input NOR Gate
•
4011- Quad 2-Input NAND Gate
•
4070- Quad 2-Input Exclusive OR Gate
•
7266- Quad 2-Input Exclusive NOR Gate
•
4073- Triple 3-Input AND Gate
•
4075- Triple 3-Input OR Gate
•
4029- Up Down Counter
•
4052- 4 X 2 Multiplexer
•
4051- 8 X 1 Multiplexer
•
7485- 4 bit binary comparator
•
4013- Dual Delay Flip Flop
•
74194- 4 bit bidirectional Shift Register
IV.
PROBLEMS FACED
1. Circuiting on breadboard was not firm enough. It was unreliable so we remade our circuit on PCB.
2. With the help of internal clock, it was hard to synchronize the ICs which require clock so we created manual clock.
FUTURE EXTENSIONS
The project can be extended as following:
1)
It Can be extended for more than 16 pin ic’s by changing some hardware and coding.
2)
It Can be extended to analog IC’s
[attachment=21758]
INTRODUCTION
We completed our project by going through these steps,
•
We made a USB to Serial Programmer ,
•
We did the basic circuit on breadboard and Tried with few basic ICs on it.
•
We developed the circuit which can put on PCB and can be used for all the ICs.
•
To make the project user friendly, we worked to make the keypad and LCD interface.
WORKING:
The IC to be tested is inserted in the base. The user enters the IC number through keypad which is simultaneously displayed on the LCD. The IC number is communicated to other MCU which basically test the ICs for few sets of input which is given through the MCU and corresponding output. The result is again communicated to the first MCU confirming it to be either correct or faulty which is displayed on the LCD.If the IC tested is ok “IC TESTED OK is displayed on the LCD.Otherwise “IC TESTED FAILED” is displayed.
For example if we want to check shift register(74194) the following steps has to be followed
if IC is ok,”IC TESTED OK” is displayed on the screen otherwise “IC TESTING FAILED” is displayed.
We also have the reset key.If by mistake a wrong IC number is typed,it can be reseted using the reset key and then correct IC number can be typed.
Fig. Block Diagram
ATMEGA 16
LCD
IC to be tested
A TMEGA 1 6
III.
ICs THAT CAN BE TESTED
•
4069-Hex Inverter (NOT Gate)
•
4081- Quad 2-Input AND Gate
•
4071- Quad 2-Input OR Gate
•
4001- Quad 2-Input NOR Gate
•
4011- Quad 2-Input NAND Gate
•
4070- Quad 2-Input Exclusive OR Gate
•
7266- Quad 2-Input Exclusive NOR Gate
•
4073- Triple 3-Input AND Gate
•
4075- Triple 3-Input OR Gate
•
4029- Up Down Counter
•
4052- 4 X 2 Multiplexer
•
4051- 8 X 1 Multiplexer
•
7485- 4 bit binary comparator
•
4013- Dual Delay Flip Flop
•
74194- 4 bit bidirectional Shift Register
IV.
PROBLEMS FACED
1. Circuiting on breadboard was not firm enough. It was unreliable so we remade our circuit on PCB.
2. With the help of internal clock, it was hard to synchronize the ICs which require clock so we created manual clock.
FUTURE EXTENSIONS
The project can be extended as following:
1)
It Can be extended for more than 16 pin ic’s by changing some hardware and coding.
2)
It Can be extended to analog IC’s