The car construcction proces is made up of four steps:

• The app disign and programming to control the car

• Construction of the car's structure

• Circuit connections

• Construction of the car's case

 

 

 

 

 

 

 

Design and APP programming

To design and program the App of the car we've used App Inventor , a simple tool to create applications.

Once we've finished the application we can install it in our Android phone with MIT AI2 Companion.

 

 

 

 

 

 

 

 

 

 

 

 

Construction of the car structure

We need: 

• Methacrylate base

• Three wheels 

• Two engines

• Romeo plate

• Two rotational encoders

• Three suports

 

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The steps that you must follow to build the structure are:

 1.  Put the three brackets in the Romeo plate.

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 2. Put the Romeo plate on the support.

 

 3. Put the speed sensors (to control the area the wheel goes across to).

The sensor is made of two parts:

a)The sensors on each engine.

• The speed sensorsare connectedto the unit sensor by the GND, IN, OUT outputs.

• The GND output to the GND entrance of the unit.

• The IN output to the OUT entrance of the unit.

• The OUT output to the IN entrance of the unit.

 

b)The unit is connected to the Rome plate by the  VCC, GND, DO1 outputs          (Sensor 1), DO2 (Sensor 2).

• The VCC output of the unit to the VCC of the RoMeo plate.

• The GND output of the unit to the GND of the RoMeo plate.

• The DO1 output of the unit to the Digital 3 entrance of the RoMeo plate.

• The DO2 output of the unit to the Digital 2 entrance of the RoMeo plate.

 

 4. Put the batery under the Romeo plate.

 

 5. Put the bluethooth (HC-06):º 

     The Bluetooth is connected to the Romeo by the outputs VCC , GND , TXD and RXD .

• The VCC output to the 3v3 entrance of the plate.

• The GND output to the GND entrance.

• The TXD output to the Digital 10 entrance.

• The RXD output to the Digital 11 etrance.

 

 6. Conect the engines to the Romeo plate

Every engine has two cables, one positive (red) and another black (negative)

• Connect the engine 1 to M1. The red cable to the positive entrance and the black cable to the negative entrance

• Connect the engine 2 to M2. The red cable to the positive entrance and the black cable to the negative entrance

 

 7. Put the protoboard plate on the base

 

 8. Connect the protoboard plate to the Romeo plate with the digital entrances 12, 13 and GND

 

 9. Connect the green led with a resistance of 220ohms at the digital exit 13 (at the protoboard) and connect to the GND (at the protoboard) 

 

 10. Connect the red led with a resistance of 220ohms at the digital exit 12 (at the protoboard) and connect to the GND (at the protoboard) 

 

 11. Connect the buzzer to the digital exit 9. And connect the black cable to GND (at the protoboard)

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 12. Connect the obstacle sensor (IR-08H) to the Romeo plate 

• Connect the GND output of the sensor to the GND of the Romeo plate

• Connect the VCC output of the sensor to the VCC of the Romeo plate

• Connect the OUT output of the sensor to the digital 5 of the Romeo plate

 

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Circuit connections

 

 

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Construction of the car's case

The car’s carcase it’s made of DM wood (5mm). These are the necessary plans to build the carcase.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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To cut the car’s carcase we had used a laser cutter, which has been provided by Xnergetic. They are at the techno campus of Mataró. They offer a service to facilitate the necessary tools to the young for doing their technologic projects.