PROJECT DEVELOPMENT-WEEK 6

Tuesday, September 8, 2009
Click the figure for enlarging the images..


Figure 1: New time table



Figure 2: Food distributor subfuction



Figure 3: mechanical movement subfunction



Figure 4:food handling & distributing subfunctions



Figure 5: sensor feedback& client request medium subfunctions



Figure 6:track subfunction

Summary:


The best alternative for each subfunction are:
1.mechanical movement subfunction :4 wheel (motor)
2.food handling & distributing subfunctions: tube & tray/slide
3.sensor feedback& client request medium subfunctions : Button (Bulb)
4.track subfunction: single slotted


FAILURE EXPECTATION

1.Sensor
We using IR & LDR sensor. We maybe face with the sensor problem because the data transfer for this sensor as analog signal. That easily gets disturbance and noise from the environment.

2.Track
Because the tyre follows the track, maybe friction will effect to the motion moreover when the tire moving in inline condition. The moving maybe stuck during moving.

3.Motor
We are using cheap motor. We concern about the speed and torque will be affected by the load on the body of robot. That will affect the smooth motion of moving.

4.Interfacing Between Hardware And Software Algorithm.
The software is not compactable with the hardware. Need some modification for interfacing them.


The improvement stage will be done later..

PROJECT DEVELOPMENT WEEK 5

Monday, September 7, 2009
Below are some design for our prototype..We have list 7 of them here..

Alternative 1:conveyor

Alternative 2: Arm mechanism


Alternative 3: Rotation tray

Alternative 4:button and ejector

Alternative 5: Tube & tray/slide

Alternative 6: pulley & box

Alternative 7: Mini deliver robot

Conclusion:
From these 7 alternative prototype ,we entirely have choosen Alternative 5: Tube & tray/slide as our primary design hitherto refer to pugh diagram..

Possible circuit:

There are two ways of constructing the voltage divider,with the LDR at the top,or with the LDR at the bottom



Below is the circuit for IR sensor


The basic design of the infrared proximity sensor