Description

Abstract :

To learn the possibility of controlling remote car using Bluetooth device, we are implementing Bluetooth based RC car control using spartan3an FPGA project kit. The project includes do it yourself procedure from disassembling RC car, removing RF circuit, placing GP board, soldering various components like hc05 Bluetooth module, L293D DC motor driver IC and Spartan3an FPGA Project kit. Finally the Mobile device with Android App is used to control RC car via Bluetooth.

Tools Required :

Software :  

• Xilinx ISE 14.7i

Language : 

• VHDL

Hardware :      

• Spartan3an FPGA Project Kit
• Hc05 Bluetooth module
• RC Car
• GP board
• Soldering Wires
• L293D IC
• Battery
• Mobile Phone

 

Block Diagram of Bluetooth Based RC Car Control :

Components Required for Bluetooth based RC car control using Spartan3an :

Bluetooth Based RC Car Control Circuit Diagram : 

HC05 Bluetooth Module :

The Bluetooth module HC-05 is a MASTER/SLAVE module. By default the factory setting is SLAVE. The Role of the module (Master or Slave) can be configured only by AT COMMANDS. The slave modules cannot initiate a connection to another Bluetooth device, but can accept connections. Master module can initiate a connection to other devices. The user can use it simply for a serial port replacement to establish connection between MCU and GPS, PC to your embedded project, etc. 

Working Principle :

Step1: Disassembling RC car

Unscrew the RC car Top. The Remote controller car is fitted with  RF Reciever  and DC motor drive IC.  Desolder RF receiver PCB. 

Step2: Placing GP board :

Now the RC car base needs to be fitted with General purpose board for component placement. Cut the GP board in to 2 half and rotate them in opposite direction. Drill the holes to place the GP board at the top of RC car base.

Step3: Solder connectors :

Solder single row headers for sparan3an FPGA project kit and HC05 Bluetooth module placement.  Solder 16 pin IC base for L293d IC placement. 

Step4: Wiring the circuit :

Next the connection need to be provided by soldering wires as mentioned in the circuit diagram. 

Step5: Programming FPGA :

Spartan3an FPGA Project kit must be programmed with Bluetooth based RC car controller VHDL code in the internal Flash memory of Spartan3an FPGA .

Step6: Screw the board :

Screw the Assembled board to the RC car base on 3 sides using screw and spacers.

Step7: Pair Bluetooth device :

Connect the batteries and pair Bluetooth device with Bluetooth RC car controller Android app in the mobile.

The following table describes the list of ASCII commands its operation performed through bluetooth 

ASCII Commands	operations performed
46	Forward F
42	Backward B
52	Right R
4c	Left L
49	Forward Right I
47	Forward Left G
4a	Backward Right J
48	Backward Left H
53	Stop S

Step8: Test the Bluetooth Car

Finally let’s control the RC car using Mobile Bluetooth Device. 

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