10. Applications and implications¶
Assignment:¶
Propose a final project masterpiece that integrates the range of units covered.
Answering:
What will it do?
Who's done what beforehand?
What will you design?
What materials and components will be used?
Where will come from?
How much will they cost?
What parts and systems will be made?
What processes will be used?
What questions need to be answered?
How will it be evaluated?
Your project should incorporate 2D and 3D design, additive and subtractive fabrication processes, electronics design and production, embedded microcontroller interfacing and programming, system integration and packaging Where possible, you should make rather than buy the parts of your project. Projects can be separate or joint, but need to show individual mastery of the skills, and be independently operable.
Assignments:¶
This week I worked on defining my final project and answering The Following questions:
What will it do?¶
● A box or container to store some necessary stuff, such as rice. When it runs out, the container will remind me and show a message on my phone. The reason is because the last weekend when I was hungry, I found that the rice had run out. I need to go out to buy it. I feel very discourage and stupid, so I wonder can I design something to store the rice, when it almost runs out, it will remind me.
Who’s done what beforehand?¶
● Some final projects from Fab Academy that are related work:
Weight scaleThe site shows how the weight sensor work.
E-binThis final project shown the frame of the box.
According to these projects, that inspired me a lot. Because of the first one, I choose the same weight sensor and using a similar frame box as the second project.
What will you design?¶
● The 2D design and cut it using a laser cutter for the frame of the case.
● The 3D design and print it using a 3D print machine to make the internal case to protect the electronics.
● I will do the electronics design, just one PCB board, connected sensor and output devices, for example, input the weight sensor, output the alarm, LCD1602, and LED, then manufacturing and programming.
What materials and components will be used? Where will parts come from? And how much will they cost?¶
Most of components for electronics design from China, I know I can take it from Fab Lab, while I prepared the final project early when the virus was spreading, the Fab Lab was closed. Also, because I am not good at electronics design, so I discussed with my friends to consult which methods, software, and components I should use? He helps me a lot, and I brought the components from China, it is cheaper than from Amazon and other online shops.
Also, I need to use the Laser cutter and 3D print machine for my final project, so I need to use the PLA material for 3D printing and MDF for Laser cutting.
How much will they cost?¶
Electronics:
| Description | Price | Pcs | Total |
|---|---|---|---|
| LED | 0.135 € | 1 | 0.135 € |
| Resistor | 0.10 € | 5 | 0.50 € |
| STC89c5-microcontroller with casing | 0.84 € | 1 | 0.84 € |
| 11.0592 MHZ Crystal Oscillator | 0.22 € | 2 | 0.22 € |
| HX711 Weighing Sensor Module | 0.54 € | 1 | 0.54 € |
| DuPont Cable 4 pin | 0.02 € | 1 | 0.02 € |
| PCB tactile switch 6mm 500x500 | 0.03 € | 1 | 0.03 € |
| Push Button Switch PCB 8x8mm | 0.39 € | 1 | 0.39 € |
| Ceramic 30 | 0.01 € | 2 | 0.02 € |
| TMB12A05 5V DC piezo buzzer | 0.06 € | 1 | 0.06 € |
| LCD 1602 with casing | 0.20 € | 1 | 0.20 € |
| Bluetooth HC-5 | 3.20 € | 1 | 3.20 € |
| Resisters Packs | 0.10 € | 1 | 0.10 € |
| S8550 Transistor | 0.50 € | 1 | 0.50 € |
| USB Power cable DC5V | 0.60 € | 1 | 0.60 € |
| DC-005 3Pin Black DC Power | 0.05 € | 1 | 0.05 € |
| Male Female Dupont Wire Jumper | 0.01 € | 1 | 0.01 € |
| total | 7.086 € |
I brought most components in Taobao except the LED, Resistor that from our Fablab.
Other:
| Description | Price | Pcs | Total |
|---|---|---|---|
| MDF | 1.50 € | 1 | 0.15 € |
| PLA | 2.00 € | 1 | 2.00 € |
| total | 3.15 € |
The material from our Fablab.
What parts and systems will be made?¶
● An external case to place objects
● An 3D printed internal case to protect pcb board
● A support plate between the weight sensor and objects A partition for protecting electronic equipment: 3D design and 3D print machine:
● A PCB containing the load cell and the bluetooth module to send data to the mobile phone
● A mobile phone app that will read the data sent from the PCB.
What processes will be used?¶
● PCB design
● 2D design
● 3D design
● Computer controlled cutting using a laser cutter
● Computer controlled cutting using a 3D print machine
● Embedded programming
● Board Milling and Soldering
● Mobile Devices Application Design
What questions need to be answered?¶
● How to code programming required for this project?
● What additional sensors do I need?
● What UI to be used to display the values on a smartphone?
How will it be evaluated?¶
● The weight sensor can measure the weight.
● The LCD1602 can show the weight.
● When the weight sensor measure the weight less than 100g, the buzzer beep few seconds.
● By the bluetooth, my phone will receive the item weight, and when the weight is less than 100g, it will remind me. I can stop the alarm by press the button.