Difference between revisions of "S14: Data Acquisition using CAN bus"

Revision as of 20:10, 22 May 2014

Grading Criteria

Project Title

Abstract

Our project is to implement a high speed data acquisition system using CAN and perform tasks according to the data received. Our system will collect data from sensors over multiple nodes and transmit the data over the CAN bus. The CAN packets are received by a single node which will do the required functionality as desired by the application.The LEDs at the receiver node simulate the functions which ca be done using the data acquired over the CAN bus.The purpose is to gather all the data simultaneously over the CAN bus and implement hardware filtering to manage the data packets on the CAN bus

Figure 1 shows the system block diagram:

Objectives & Introduction

Our idea is to use the on board accelerometer and gyroscope together as a motion/gesture sensor to identify the motion then it will send to the other board via CAN bus. We are planning to use 6 degree of freedom MPU-9150 sensor for doing precise movement tracking. Recognized movement will trigger predefined tasks and transmit to Android phone via UART-Bluetooth module. More sensors will also be added to do data acquisition.

Team Members & Responsibilities

• Shweta Bohare
  • Can bus Interface
• Mradula Nayak
  • Can bus Interface
• Heng Zhang
  • Accelometer and sensors

• All Team
  • FreeRTOS Software Design
  • 3D on the computer

Schedule

Show a simple table or figures that show your scheduled as planned before you started working on the project. Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals. The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.

Parts List & Cost

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

Power Supply : An LM7805 linear regulator IC is used for this purpose. It converts a DC input voltage of range 7-25 V to a stable +5 V. It requires just two external capacitors and is very easy to useThe input DC voltage for LM7805 could be obtained from a 9V DC wall adapter that can supply 1 Amp of load current.We need the 5 volt supply for all the external ICs have been used in this project like MCP2551 and MPU6050.The following schematic is generate the 5Volt regulated power.

The MCP2551 is a high-speed CAN, fault-tolerant device that serves as the interface between a CAN protocol controller and the physical bus. The MCP2551 device provides differential transmit and receive capability for the CAN protocol controller, and is fully compatible with the ISO-11898 standard, including 24V requirements. It will operate at speeds of up to 1 Mb/s. It is used for following functions: 1. As a Transmitter: It operates in two states Dominant and Recessive. When differential voltage between CANH and CANL is less than 102 V it operated in dominant mode, and when the voltage difference is less than 1.2 volt it operates in Recessive mode. These both modes are corresponds to the TXD pin . 2. Maximum nodes: allowing a maximum of 112 nodes to be connected 3. Receiver Function: The RXD output pin reflects the differential bus voltage between CANH and CANL. The Low and High states of the RXD output pin correspond to the Dominant and Recessive states of the CAN bus, respectively. 4. Operations.High speed flow control and standby. High-Speed mode is selected by connecting the RS pin to VSS. In this mode, the transmitter output drivers have fast output rise and fall times to support high-speed CAN bus rates. The slope, or slew rate (SR), is controlled by connecting an external resistor (REXT) between RS and VOL (usually ground). The device may be placed in Standby or SLEEP mode by applying a high-level to the RS pin MCP2551

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.

Software Design and Implementation

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

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.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

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

My Issue #1

Discuss the issue and resolution.

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

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Appendix

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