dishwash washer

PROJECT SYNOPSIS

ON

DISH WASHER

MAJOR PROJECT

AT

BACHELOR OF TECHNOLOGY

IN

MECHANICAL ENGINEERING

Session 2010-2014

Department of ECE

Submitted To:-                                                             Submitted By:-       

Er. Mandeep Kaur                                                                               Mohit Sood

                                                                                                             100140413269

Index/ List Of Figures

S. No.	Topic	Page No.
1	Objective	3
2	Introduction in Brief	3
3	Design of Problem Solution	8
4	Methodology Planning of Work	10
5	Facilities provided for proposed work	12
6	References	15

ACKNOWLEDGEMENT

 We are very thankful to HOD electronics and other lecturer for guiding to select this project. It will be fruitfull time to convert theoretical knowledge to practical knowledge.

We are thank ful to Mrs. Manu Bharti for guiding to make Robotic arm using microcontroller.

Introduction:-

In this project  we divided project in two parts. One is Pneumatic and other is motors controlled. Motor control is to hold dishes. Pneumatic system is to move dishes in water for washing purpose.

 There will be two tubes having different liquids for washing pupose. Our system will hold dishes and dip in first tub and then after some movement it will dip in another tub. We have to take decision should we make robotic arm for all movement purpose or a trolley to move pneumatic system from one tub to other. We will control these mechanically  because we don’t have knowledge of automation.

There will be

Dish Holder

                                                                            2”

                                                                 3

                                                                                              3”

                                                                           3”

Jaws will be metallic. They will be made of sheet metal.

ARM: arm will be made up of wood material.

                                                                                       2

                                         1

                                                                                                          3 inch

10 inch

Stepper motor

 stepper motor have five wires . One for common supplies another four for winding purpose. By giving different signal to each we will control the stepper motor.

The wires from the Logic PCB connector to the stepper motor in a TM100 Disk Drive are as follows

This kind of motor has four coils which, when energised in the correct sequence, cause the permanent magnet attached to the shaft to rotate. There are two basic step sequences. After step 4, the sequence is repeated from step 1 again. Reversing the order of the steps in a sequence will reverse the direction of rotation.

---

a. Single-Coil Excitation – Each successive coil is energised in turn.

Step	Coil 4	Coil 3	Coil 2	Coil 1
a.1	on	off	off	off
a.2	off	on	off	off
a.3	off	off	on	off
a.4	off	off	off	on

This sequence produces the smoothest movement and consumes least power.

Single-Coil Excitation

Inside a Stepper Motor
The stepper motors we are concerned with are those taken out of old 5 ¼” floppy disk drives. Some of the comments below may therefore not apply in all cases…

A	B	C	D

The simplest way to think of a stepper motor is a bar magnet and four coils. When current flows though coil “A” the magnet is attracted and moves one step to the right. Coil A is then turned off and coil “B” turned on. The magnet moves another step to the right. Coil “B” is then turned off and coil “C” turned on. The magnet moves another step to the right and so on… A similar process occurs inside the stepper motor, but the ‘magnet’ is cylidrical and rotates inside the coils. In order to make a stepper motor rotate you must turn on each coil in the correct sequence. The motor will continue to rotate as long as you continue the sequence. A typical code sequence would be:

count := 1 repeat
	port[888] := 1; delay(50); port[888] := 2; delay(50); port[888] := 4; delay(50); port[888] := 8; delay(50); count := count + 1;
until count > 50;

NOTE1: The “delay” is needed provide enough time for the magnetic field inside the coils to build up and the magnet to move. Without the ‘delay’, the coils will switch on and off so fast that the magnet will not get a chance to be attracted and it will not move. NOTE2: To reverse the direction, simply reverse the output order.
The Coil Switch-on Sequence

The stepper motor in a 5 ¼” floppy drive (the one that moves the head back and forth over the disk – NOT the one that spins the disk) has FIVE wires coming out of it. If you are lucky they will be coloured Brown, Yellow, Red, Blue and White. (Many of the ones I’ve looked at have five brown wires!)

The ‘four’ coils described above are actually arranged as two 150 ohm coils with centre taps. The centre taps are lines “1” and “2” in Figure 1.1. This line is generally called the “common”.

Figure 1.1

Measuring the resistance between each of the wires coming out of the motor produces the following readings:

Measured Resistance (ohms)

	1	2	1a	1b	2a	2b
1	–	0	75	75	75	75
2	0	–	75	75	75	75
1a	75	75	–	150	150	150
1b	75	75	150	–	150	150
2a	75	75	150	150	–	150
2b	75	75	150	150	150	–

One of the five wires is the ‘common’. You can easily identify the common with a multimeter. It will be the one that reads 75 ohms between it and all the other four lines in turn. The other four are impossible to identify using a multimeter. You will need to use an interface and connect it to a computer for the next step. (You could just use wires from a 12 volt battery if you wanted.)

Using the Demonstration Interface to Drive a Stepper Motor
(For details about the Demonstration Interface see: robokit.html)

• Connect a 12 volt DC supply to the demonstration interface (in place of the 9 volt battery).
• Solder the ‘common’ lead to the positive line on the Demonstration Interface.
• Solder each of the other four wires to the points where the resistor connects to a line from the ULN2803. (Keep the wires in order from the common wire and solder them to data lines 0, 1, 2, and 3.)
• Connect the interface to a computer and send ‘out’ commands of 1,2,4 and 8. The motor should ‘step’ in a clockwise, or anti-clockwise direction. – If it ‘jerks’ as it tries to change direction, or simply ‘shudders’ you will need to experiment with other control sequences.

Hopefully your motor moved in a consistent direction. Now you need to write code as outlined above and try for complete rotations

BLOCK DIAGRAM

		Dish holder
	DC MOTOR

 

Requirements:

• Plastic tubs
• Pneumatic Cylinder
• Limit switches
• Valves
• 8mm pipe for pneumatic
• DC servos 12 volt
• Iron bars
• Welding set
• Wood 2” x 1” lengths
• Screw driver
• Steel Screws
• Nut and bolts 2”
•  

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