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The iterative prototyping process starts with using the force sensing resistor to control the motor so that it can simulate the Morse Code. Then, the pushing button and NeoPixel LED light were added. The NeoPixel LED light was set to be controlled by the pushing button. Next, two Particle Photon board was programmed to communicate with other by mutually controlling vibration motor and NeoPixel LED light on the other side. Finally, the pushing button, the NeoPixel LED light, the vibration motor, and the force sensing resistor were assembled on the dog tag.

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