Week 3: We are almost there

Our work:

1.     Upgrade the construction by removing a slaver Arduino on the car

2.     The car initially could recognize the signal source and have some response movements.

Method:

The original hypothesis is to modulate each function as a component model. The alternative way is to synthesize the total car by using only one processor, which means impose one master processer instead of attachment slaver. Thus, there are only one master and one slaver communicating with wireless modulation which called as 315 mhz remote control.

After connecting each wire, the predictable result is that when one distance of slaver ultrasonic is near to that of master, the wheels will rotate. These testing programs only ensure the conception was correct. The most complex part is to constrain the condition codes to make the response sense. In details, three slaver distances on the car compare to the distance on the controller, which difference is smallest then that means the detecting position is at this direction with the specific mark. Because of the principle of PWM, the maximum number is 255 to stimulate the motor to rotate. There are three motion models, for example, going forward, turning right and left, which is set by different number for each wheel. For now, it was achieved to detect the reference signal by holding remote control. 

Results: 

Figure 1: The prototype of the automatic following car

Video: Some response movements of the car when it detect the handle

Problems:

The problems we encountered were that the track was not rational. That was because the limiting condition was not enough specific. Also the power supplier was not strong so that the capability of processor is not stable.
 

Here comes the plan for next week:
1.      Refine the circuit layouts, using more suit length of wires
2.      Test the requiring terms which to estimate the quality and sustainability.