Difference between revisions of "S15: CAN controlled RGB LED cubes"

Revision as of 21:44, 28 April 2015

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Code Quality
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- Software Block Diagrams
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  Schematic Quality
- Quality of technical challenges and solutions adopted.

Project Title

CAN controlled RGB LED cubes

Abstract

In this project, data(1 byte) sent from an android application will be displayed in a 3D form on a LED cube. Two LED cubes will be connected to two different SJone boards, these SJone boards are connected to a third SJone board using CAN bus. The LED cubes will be connected to their respective SJ boards through shift registers. The boards will implement SSP protocol to communicate with the shift registers. A bluetooth module is connected to third SJone board. Android application sends data to be displayed along with the information about the SJone board(one of the LED cube) to be selected.

File:Basic Block Diagram.png

Objectives & Introduction

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Team Members & Responsibilities

Chitrang Talaviya
- LED cube design
- Implementing CAN protocol
- Bluetooth module interfacing
Navjot Singh
- Implementing CAN protocol
- Bluetooth module interfacing
- FreeRTOS environment
Anuj Korat
- LED cube design
- Generating dynamic patterns
- Implementing SSP with the shift registers
Daamanmeet Paul
- Android application development
- Generating different characters on LED cube

Schedule

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Week#	Start Date	Task	Status	Completion Date
1	3/15	Finalizing & ordering components -Going through the requirements of the project -Order hardware components based on the final list	Completed	3/17
2	3/27	3x3x2 LED cube testing with SPI interfacing -Studying the SC74HC595 shift register datasheet -Constructing a 3x3x2 LED cube for testing purpose -Interfacing of shift register using SSP1 with LPC1758 -Cascading of 4 shift registers using SSP1 to control anodes & RGB cathodes	Completed	4/10
3	4/8	Bluetooth Interface with SJone board through Android APK -Testing the AT commands of Bluetooth RKI-1545 module using hyperterminal(Completed) -Testing interfacing of bluetooth using UART2(In progress)	In progress	4/17
4	4/8	Android application	In progress	4/25
5	4/16	4x4x4 LED cube construction -Building 2 LED cubes -Interfacing & cascading of the shift registers with SJone boards to control 16 anodes and 12 cathodes using SIPO configuration of shift register -Interfacing of LED cubes with shift registers	In progress	4/26
6	4/20	CAN protocol programming -Studying the CAN protocol datasheet(completed) -Setting up the interface of CAN transceiver and SJone boards(In progress) -Initially making two-nodes CAN configuration(Not started)	In progress	4/30
7	4/27	Generating patterns on LED cubes -Building libraries for generating Alphabets & numbers on the LED cubes	Not Started	5/7
8	5/1	Implementing FreeRTOS for the system -Implementing queue RTOS feature to connect the bluetooth interface and the CAN interface of the LPC1758 board	Not Started	5/10
9	5/10	Final Debugging & testing	Not Started	5/15

Parts List & Cost

#	Components	Quantity	Price($)/component
1	RGB LEDs pack of 100	2	9.95
2	CAN transceivers	15	Free
3	Shift registers, SC74HC595	10	1.49
4	SJone boards	3	80
5	Bluetooth module	1	20
6	Steel wire	1	8
7	Soldering kit	1	~40
8	Jumper wires(each type)	1	25
9	ULN 2003	4	12

Design & Implementation

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Hardware Design

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Hardware Interface

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Shift registers have been used to communicate betwen the SJone board and the LED cubes. As the dimension of the cue is 4 x 4 x 4, it needs a total of 28 pins to control it, 16 pins to control 16 groups of 4 LED anodes and 12 pins to control 4 planes of the RGB lines. As we do not have that many pins on SJone board, we will be using 4 Serial- input-parallel-output shift registers to drive the LED terminals. This eases our job as only 4 pins are used from the board to drive 28 LED terminals.

The communication bus used between the LPC1758 board and the shift registers is SSP-Synchronous Serial Port. The driver written for the communication is as shown in Fig. All the shift registers are cascaded, meaning the serial output of one, connected to the serial input of the other. This way a total of 32 bits of serial data from the board can be converted into parallel outouts which are given to its respective LED terminals.

File:1234.png

SC74HC595 Shift Register Pin Diagram

Software Design

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Android Application Development:-
Tools used to Develop Android Application

· Android Studio based on IntelliJ IDEA.

· Java Development kit 7 by Oracle.

· Android ADB interface.

· Android API 21 platform.

Application Features

· Bluetooth pairing up to 6 devices at a time.

· Facility to change Transmission Protocol within the Application.

· Send Data serially to any serial Bluetooth Device.

· Receive Data serially from any Bluetooth device using same protocol.

Application development Procedure

Application is developed upon the sample code provided by http://developer.android.com/guide/topics/connectivity/bluetooth.html

Bluetooth APIs setup available in the android.bluetooth package

· BluetoothAdapter

Used for the local Bluetooth adapter (Bluetooth radio). The BluetoothAdapter is the entry-point for all Bluetooth interaction. It is used to discover other Bluetooth devices, query a list of bonded (paired) devices, instantiate a BluetoothDevice using a known MAC address, and create a BluetoothServerSocket to listen for communications from other devices.

Implementation

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Testing & Technical Challenges

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My Issue #1

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Conclusion

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Project Video

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Project Source Code

Sourceforge Source Code Link

References

Acknowledgement

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References Used

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Appendix

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