Fall Biped 2016- Schedule and Burndown

By: Ijya Karki (Project Manager)

Table of Contents

Introduction

One of the most important documents that the Project manager produces is the schedule. The schedule will pace how your project will progress. The hardest part about preparing the schedule is to know which tasks to give each member and when to have these tasks completed.

Requirement

Creating the schedule correlates to Biped’s requirement: “Shall be ready to participate in the game ‘Save the Human’ on December 14th, 2016.”

Determining Tasks

Tasks should be determined based on the generic year schedule that Professor Hill provides and the work break down schedule that is presented at the beginning of the school year.

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Figure 1 Generic Schedule [1]

I determined the various tasks that should be completed by reading the job descriptions [2] and keeping track of the different expectations of each division. Then, I went through what I wrote down and highlighted the tasks that related to what Biped had to accomplish.

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Figure 2 Work Break Down

Project Libre

Download project libre (http://www.projectlibre.com ) to create the schedule based on the work breakdown structure you come up with. Once project libre is opened up, create a name for your project and input the start date of your schedule (the beginning of the semester). Then proceed to fill out the tasks determined above and include due dates based on the generic class schedule.

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Figure 3 Project Libre Open Screen

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Figure 4 Project Libre Task Input

*Note:  various tasks can take longer than the ideal time. To compensate for this, make sure to add extra time to each task*

Once a task is completed click the column to the immediate right of the number column to mark the task as finished. This can be accomplished by marking a 100% for completion.

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Figure 5 Completed Task on Project Libre

Biped’s Schedule

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Figure 6-8 Biped’s Project Libre [3]

Burndown

            Once the schedule is complete, the next step is to create the burndown. The purpose of the burndown is to represent the progress of the group in a graphical form.

The burndown can be created on excel by listing a column of all the tasks mentioned in the schedule. Then make a row listing the number of the weeks in the semester. After that, fill out the boxes with the percent amount left to accomplish per task each week. This means that the left most column is 1 (representing 100% of the task left to fill in). As the project progresses each week, decrement 1 to represent the amount of work left to complete the task. The last two rows consist of the ideal row (total tasks spanned out with total weeks) and reality done (sum of task percent completed).

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Figure 9 Burndown Excel Example

Biped’s Burndown

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Figure 10 Biped’s Burn Down

Conclusion

The burndown is based on the schedules, the schedule is created from the work break down structure, and the work break down structure stems from the job descriptions. The purpose of the burndown is to produce a visual representation of the project task completion. One can find the percentage of tasks completed by dividing the tasks completed by the total tasks.

Reference

[1]http://web.csulb.edu/~hill/ee400d/Lectures/Week%2005%20Project%20Plans%20and%20Reports/c_Generic%20Schedule.pdf
[2]http://web.csulb.edu/~hill/ee400d/Lectures/Week%2001%20Welcome/c_Job%20Descriptions.pdf
[3]http://www.projectlibre.com

 

Fall Biped 2016- Updated Stall Current Motor Experiment

By: Alan Valles (Electronics and Control)
Approved by: Ijya Karki (Project Manager)

Table of Contents

Introduction

The Purpose of this experiment is to measure the stall current of the Pololu 1117 motor. This will be done in order to compare it to its rated value of 800mA.

Introduction

A stall current experiment was performed in order to see the actual stall current produced by Pololu 1117, this was done at the recommendation of Project Manager and ENC Division manager. Stall Current was measured utilizing two Pololu 1117 130 motors. The motors were set up in a mini vise as shown. Two small electrical loads were applied, one 100Ohm and One 1Ohm. The currents into the driving motor and out of the receiving motor were measured. As discussed in ENC meeting this should give us our stall current. The stall Current for the Pololu 1117 is rated at 800mA on the Pololu website.

The first run of test result in really low output currents to the motor load. However, this was due to the shafts losing grip of each other because the electrical tape overheated and began to lose grip of the two shafts. Thus, the receiving motor did not spin at a strong frequency with the other motor. The tape was redone and the experiment current increased by about 60%. Thus, the measured stall current would be around 492 mA. However, the measured current from inside a Tamiya gearbox was about 500mA so this value does not make sense. However, if another device could be used to tightly grip both motor shafts in order to better sync their frequencies than the number may have been closer to the rated 800mA. However, the rated 800mA was for 6v DC but the motor will be operating at 5V DC. As shown in the experiment. Taking the maximum motor value of 335 and multiplying by two we get, 670mA. This value is less than the rated 800mA rated stall current. One can figure that the actual stall current will be under the rated 800mA

Electrical Load Driving Motor Current Load Motor Current
100Ohm 321 50
1Ohm 335 100
1Ohm Redo 328 164

 Conclusion


In conclusion an experiment was done to measure the stall current of the Pololu 1117. The results were not definitive. However, using worst case analysis, the stall current of the Pololu 1117 motor can be seen as less than the 6v rating of 800mA since we will be operating at 5v.

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Reference

[1] http://arxterra.com/pathfinder-motor-stall-current-test/