Week 3

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This week, after discussion, the work plan of two groups in week two was decided.

For motor group, they should complete the library files of controlling part, and test them to make sure they work. Furthermore, they should spend some time too study the working principle of Bluetooth on arduino.

For Flex Sensor Group, they are planned to test the resistance of flex sensors, and study the work principle of flex sensors on arduino. In addition, if they have enough time, they should complete some codes of Bluetooth and flex sensors. 

However, the flex sensors still not available and we can't test the resistance and work principle of them this week. We had to work on the codes of Bluetooth and flex sensors first.

Working detail

Motor Group:

In the morning of the lab day in week three, the work is boring. Actually, we spend almost the whole morning in debugging, because it is the first time for us to write the library files for arduino. There were some data type problems and structure problems on it, and it cost us too much time to check and solve them. After that, the codes were tested, and all of them were working. In addition, some comments of the library files were written. The completed library files were shown in figure 1 and 2.

Figure 1: motor.h file of library file

Figure 2: motor.cpp file of library file

In the motor.h file, it has defined the pins, variables and functions. Moreover, the motor.cpp file defined the codes for each function, and connected the pins to the outputs and inputs.  

In the afternoon, we start to working on the receiver part of the Bluetooth. Thank to the slow delivering glove group did not get the flex sensors, so we have no master part of the Bluetooth. Therefore, we can only test the receiver part of the Bluetooth without master part. However, glove group have paired the Bluetooth. Consequently, we have to employ a new Bluetooth and try to connect it to phone, and use phone to communication.

At the beginning, as it shown in Figure 3, we connect the BH 05 Bluetooth module to arduino. After that, we adjusted it into AT mode, and we do a lot of adjustment on Bluetooth such changing name, pairing and changing password. Then we change the name and the password of it. The glove group had tested and found the address of each Bluetooth, so we just need to find the corresponding Bluetooth on the application of the phone. However, in the whole afternoon, we could not found the corresponding Bluetooth on the phone, and we feel depressed about that. 
Figure 3, Car with Bluetooth 


Flex Sensor Group:

In the morning, we test the two HC05 Bluetooth and tried to match these two Bluetooth. After searching for information, the code for Bluetooth matching had completed. Then we made some adjustments to the code, uploaded the code to Arduino and adjusted the relevant data, two Bluetooth matched successfully.

In the afternoon, our flex sensor hasn't arrived yet, so we can’t test the whole circuit. We looked up a lot of information about sensors and wrote a rough code for it, the code of flex sensors is shown in Figure 4. When the sensor arrives next week, we can use this code to test it.
Figure 4. The code of flex sensor

By communicating with the motor group, the basic communication plan was worked out and the rough code was written. Work outside the sensor is almost complete, we only need to wait for flex sensors to link these small sections together. 

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Week 4

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In week four, the flex sensors were arrived and all previous sections could be connected. All the action modes of car was completed and tested. Moreover, the test of employing Bluetooth to control the car was successful, which means most work of car part was completed.  Working Details Motor Group: Before the lab, we have spent some time at home to writing the codes of the nine running modes, and each of them were tested to ensure they are working.  The video of testing is shown below.  However, there is a problem that the buttery could not supply enough voltage to run the motors and arduino at the same time. Therefore, a portable power bank was employed to supply power for the car, but it is too heavy for the car. Consequently, another power supply should be found. Video of testing In the morning of the lab day we were trying to connect the arduino and phone. At this time, the phone can find the Bluetooth. However, there are still some bugs on it, whic...
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