Difference between revisions of "S14: Divine WINd"

Revision as of 00:37, 20 April 2014

Grading Criteria

Divine WINd

Abstract

Divine WINd is a quadcopter that focuses on stable flight and simple movement controls. There are two modules in which Divine WINd are composed of: the controller and the quadcopter. The controller module sends a signal to the quadcopter in how the quadcopter's pitch and roll orientation should be set to. The quadcopter's orientation dictates the type of movement the quadcopter will perform.

In order to set to the quadcopter to its desired orientation, an accelerometer and gyrometer are implemented in order to receive the quadcopter's current orientation. The quadcopter will then adjust its fan blades to balance itself in order to be re-positioned to its the desired orientation.

Objectives & Introduction

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Team Members & Responsibilities

• Ryan Marlin
  • (Team role)
• Eriberto Velazquez
  • (Team Role)
• Devin Villarosa
  • (Team Role)

Schedule

Design & Implementation

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

ESC Interface

The SJOne board communicates with the ESCs via PWM. The SJOne's PWM output is connected to the white wire of the ESCs 3 pin input. The ground is connected to the black wire, and the ESCs red wire is left hanging, because it is a 5V output. In order to calibrate the ESCs, so that the ESC can produce the range in which the PWM's duty cycle dictates the rate in which the motor produces, the following steps must take place, depending on the ESC manufacturer.

The following steps are used to calibrate this project's ESC:

1) Disconnect power to the ESC

2) Set PWM to an acceptable ESC frequency (between 100hz - 400hz)

3) Set PWM duty cycle to its maximum rating (99%) (This step simulates using a flight controller's transceiver's throttle to the maximum)

4) Plug power to the ESCs

5) Until ESCs gives "beeping signal" in which it accepted its maximum throttle rating, set PWM to lowest throttle (0%) (This simulates using a flight's controller to its minimum throttle).

6) Wait until ESCs "beeps" to signal that accepted minimum throttle is accepted

7) The ESCs has now internally calibrated its throttle acceptance. The user can now send different duty cycle ratings in order to manipulate all motors.

Accelerometer and Gyrometer Interface The acceleroeter and gyrometer are packaged in the Sunkee 10DOF 9-axis Attitude Indicator. For this project's application, only the accelerometer and gyrometer are necessary to retrieve the quadcopter's current orientation. Due to this IMU's package, all sensors are tied on the I2C bus and are accessible via I2C.

Software Design

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The MPU-9150 consists of a 3-axis accelerometer, 3axis Gyroscope and a 3 axis magnetometer. its a one chip IMU solution with onboard Motion processor for sensor fusion.Though it inherently supports on board Sensor Fusion, the IP is undisclosed. Therefore we used the library for arduino by Pansenti. (https://github.com/Pansenti) The 6 axis sensor fusion (accel+gyro) is done on the MPU and sent to an arduino where the magnetometer data is used for YAW correction. The arduino transmits the orientation data over UART which is recieved by the SJONE for further processing.

For testing, we coded a GUI in python. The code parses the serial data from the arduino and displays the orientation of the IMU in real-time using Vpython.(video and code to be linked).

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Controller Software Implementation

Quadcopter Software Implementation

Testing & Technical Challenges

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Include sub-sections that list out a problem and solution, such as:

Shipping Time

Problem: The first quadcopter kit was shipping from China. This problem may result in a possible 2-4 weeks delay in working on the project.

Solution: In order to place it safe, the team ordered the same kit from an American retailer on Amazon. Additionally, the initial kit from China was delivered 10 days after ordering.

Suggestion: Make sure parts are ordered in America

Shorting Lipo Battery

Problem: The team terminated the battery wires so that powering the quadcopter system will be convenient. When terminating, the power and ground wires touched, causing the Lipo battery to short and break. Lipo batteries are very volatiles and needs to be handled with care.

Solution: Team ordered a higher-grade Lipo battery in order to increase quadcopter's flight time

Suggestion: Make sure that power and ground do not cross

Flimsy Quadcopter Supplies

Problem: ESCs and motors are bound to break. Team ordered an extra ESC online, but of a different brand. This resulted in a stronger ESC, which causes an imbalance when flying the quadcopter and delay in progress.

Solution: Used spare parts from second quadcopter

Suggestion: Order 2 more ESCs and motors of the same brand

Conclusion

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Project Video

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Project Source Code

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References

Acknowledgement

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References Used

List any references used in project.

https://github.com/Pansenti https://code.google.com/p/sf9domahrs/

Appendix

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