Engineer

Jack M

Area of Interest

Biology/ Engineering

School

SAR high school

Grade

Incoming Senior

My project is a device that uses inferred light to create a contrast image depicting  the location of veins.

Second Milestone

For my Second Milestone,

First Milestone

Raspberry Pi, NOOBS Raspbian
pi-plug-in

For my first milestone, I set up the raspberry pi that I will use to in designing my main project. First I download Noobs, the operating system installer, from the Raspberry Pi website(Shown in figure 1). Once I downloaded, I next formatted the SD memory card I am using with the Pi and Installed on to it the Noobs files. After setting up the memory card, I plugged the Raspberry Pi into a power supply and inserted the SD card into the Pi, as well as a keyboard, mouse and a monitor connected through HDMI cable(Shown in figure 2). I finished setting up the operating system by setting a password, logging into Wifi, and making sure the screen border is set correctly. In my first attempt, I destroyed a Pi by connecting it to a faulty HDMI cord, causing it to short circuit. Now that I have my Raspberry Pi set up, I am excited to begin working of assembling my device.

Starter Project

The useless machine works by having the switch trigger a motor, causing the arm to move upward and reverse the switch. The switch being hit back off, causes the arm to return into the box. The parts of this project are all connected by being soldered to the same printed circuit board (PCB), which mechanically supports and electrically connects electronic components using conductive tracks, pads and other features. First the switch was implanted, followed by two resistors, which control the electrical current, the two screw terminals and a snap switch. The screw terminals is where wires are held by a tightened screw, in this case from a motor and a battery back. When the switch is flipped, it causes the motor to turn clockwise and for the arm to raise up. As the arm moves, it releases from the snap switch, allowing the led to light up green. When the arm reaches the switch, and flips it back, the motor begins to turn counterclockwise and the light becomes red. The motor is able to move in multiple directions by the use of an H-bridge, which is an electronic circuit that switches the polarity of an applied voltage. Once the arm returns to the snap switch, the light and the motor go off.

These are the instructions

My Starter Project is the Useless Machine, which presents externally as a simple box with a switch on top. Its main operation is that when the switch is flipped, an arm arises from inside and turns it back off. It also contains an LED light that turns green as the arm rises and red as it descends.

Figure 1: Machine in resting state

Figure1: The assembly of the my starter project can be seen above.

Figure 2: Switch flipped/Arm rising

Figure2: The hook coming out of the box to flip the switch. Notice the green LED light

How it works

Figure 3: When switch is flipped on.

useless-machine-3

Figure 4: When switch is flipped off.

useless-machine-4

In this process, I learnt how to solder onto a PCB board in order to connect the parts of a project. Additionally, I obtained a better understanding for how electrical components interact, and I am excited to move on to my main project.

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