Week 4

Week 4      26/02/2023


In week 4, the details of the circuit were completely worked out. This week was mainly devoted to the assembly and debugging of the circuit and housing parts.

 


Accomplishments :


1、The problem that the motor could not run in the circuit last week was solved by adjusting the position of the BJT in the circuit.

2、Used the acrylic board to complete the production of the shell of the dealer.

3、The normal operation of the overall dealer was achieved without putting playing cards.

 


Problems and alternatives :


In the final stage, replacing the computer connection with a lighter battery would give the device a better look. After replacing the computer USB power supply with a 9V battery, the designers found that the 9V battery could not provide enough voltage to the servo motor in the circuit. Then, the team members discussed and made some assumptions to adjust the structure of the housing, so that the computer USB can provide power while ensuring the aesthetics of the structure.


Figure 1:   Two parts of the automatic card dealer


Moreover, it was impossible to get the DC motor to precisely control the number of cards to be dealt. The group went through three ways to make adjustments. First, adjusting the external material of the gears has achieved the effect of changing the friction. Second, adjusting the operation time of the gears to ensure the success rate of dealing cards. Third, adjust the contact angle between the gears and the cards to reduce the resistance of the gears.

 

Figure 2: The dealer requiring adjustment

 

 

Future : 

 

The group will have two main tasks in the coming week. First, the final adjustments will be made to the licensing section of the dealer. The team will replace the original paper shell model with a new wooden model that will make the dealing part lighter and easier to control the number of cards dealt. Secondly, we will finish making the poster and rehearse the presentation.



Figure 3: The redesigned .dxf file


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