Project Development By: ImanG No comments

What is my group chemical device?

• Half-boiled egg cooker prototype. 
• Is to assist coffee shop workers with their job.
• Perfectly cooked half-boiled eggs by using our device without any human error.

How does it work? 

• When the temperature of the water is at the right temperature. 
• The egg will be submerged into the pot of hot water. 
• The timer will start when the egg is submerged. 
• The egg will be lifted up after a specific time.
• Therefore, the consistent perfectly cooked half-boiled egg is achieved. 

How my team planned, allocated the tasks, and executed the project

Step 1: We used the design thinking process. Eg: Ideations of the product, TRIZ and Part -whole analysis.

Step 2: We formed the BOM (BILL OF MATERIALS). 

Step 3: We formed the Gantt chart. 

Step 4: Allocation of the task.

Task	Name
CAD modelling of frame, box, attachments Frame construction Gather materials, components	Alex
3D printing of attachments DC motor coding	Emily
Temperature sensor coding Test run for combined code	Iman
Laser-cutting of box	Syufyan
Product assembly	Everyone

Design and build process of the Half-boiled egg cooker  

Part 1 : 

CAD modelling of the frame, box, attachments (Done by Alex)

Link to Alex's blog: https://neoyijiealexcp5070.wixsite.com/cp5070-2b07-gp5-alex

Part 2 : 

3D printing of attachments and DC Motor code (Done by Emily)

Link to Emily's blog: https://cp5070-2021-2b07-group5-emily.blogspot.com/

Part 3: 

Temperature sensor code and combine code for a test run (Done by myself(Iman))

How do I code the temperature sensor in Arduino?

Step 1: Research the DS18B20 temperature sensor on the internet.

Step 2: Learn how it works on Youtube.

Step 3: Build the circuit. Source: Click this link

Step 4: Install library for the DS18B20 Temperature sensor into Arduino IDE. 

Step 5: Coding on Arduino. 

Step 6: Test the code. 

https://youtube.com/shorts/8LdMqE2Aqu8?feature=share

One important component for the DC Motor is L298N (H-Bridge)

This L298N (H-Bridge) will help to provide power to the DC motor. If we use a bigger DC motor, we can supply more voltage to H-bridge to power the motor. 

Furthermore, it will help to change the direction of the motor. For example, from clockwise motion to anti-clockwise motion. 

Combine the 3 components into one circuit

We added 2 powerbank to power the Arduino Maker Uno and H-bridge for portability. Furthermore, we add an on/off switch so that it is easy to turn on/off with the box.  

Combine the 2 codes (Temperature sensor and DC motor) 

*The final combined code

 

Part 4 : 

Laser-cutting of the box (Done by Syufyan)

Link to syufyan's blog: https://syufyan13.wixsite.com/cp5070-2b07-syufyan

Problems and solutions: 

Problems

• The basket was not in the right starting position 
• The code only runs when the temperature is at the set point.
• The DC motor does not have the braking power needed to hold the basket in place (gravity) 

Solution

• The rest of the code runs when the temperature has been reached. 
• Use a bit of power to hold the motor to hold it in place.
• Using the absent braking power - let gravity pull the basket down.  

Project design file as downloadable files : 

Link: https://drive.google.com/drive/folders/13RcLYDOXttb3ibo3YT5ZwWFI1WGj_lzx?usp=sharing