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Design

Depicts vaious design aspects associates with this project.

Table of contents

Case

Rendered Calculator
Rendering of Casing for Calculator.

AutoCAD Drawings

Case Outline AutoCAD
2D Outline of Case in AutoCAD

Mocked up in AutoCAD to determine layout, espcially in regards to PCB orientation and configuration. Exported as a dxf, and utilized to build enclosure in Fusion360 from this initial sketching. All dimensions for the Fusion360 model determined from this intial sketch.

Outline Comparision
Comparision between the initial 2D AutoCAD sketch, and the finalized model in Fusion360.

Fusion360 Models

Case Bottom

Case Bottom
Bottom Case for Calculator.
Case Bottom with PCB
Bottom Case for Calculator with PCB's included.

Case Top

Case Top
Top Case for Calculator.

Case All

Case Top
Full Case Design for Calculator.

Case BOM

All casing produced and manufactured by PCBWay's Stereolithography (SLA) Printing Service1. This SLA service allows for precise and accurate feature resolution. For this project, the material of choice was the standard white material (UTR 8360), providing great dimensinoal accuracy while also being durable. Pricing for each part of the enclosure is shown in the table below.

Component Cost
Display Top $4.98
Display Bottom $8.46
Case Top $16.68
Case Bottom $17.42

Keyboard Module

The keyboard module is responsible for alphabetical input from the user. This is handled by a full qwerty keyboard, in addition to other keys aswell.

Keybaord Module Schmatic
Keyboard Module KiCAD Schematic.
Keybaord Module PCB
Keyboard Module PCB Routing and Component Placement.
Keyboard Module 3D PCB
3D Render of Keyboard Module PCB.
Slide10
2nd 3D Render of Keyboard Module PCB.

Keyboard BOM

Keyboard module PCB manufactured by PCBway's PCB fabrication service. The following table details the components used within the module, along with information on pricing for the actual PCB.

Component Cost Link
RP2040 Stamp $12.00 https://www.tindie.com/products/arturo182/rp2040-stamp/
KSA1M331LFT SPST-NO $0.91 https://www.digikey.com/en/products/detail/c-k/KSA1M331LFT/1003897
Tactile Cap Oval (BLACK) $0.39 https://www.digikey.com/en/products/detail/c-k/BTNK0390/559405
FPC 10Pin Connector $1.13 https://www.digikey.com/en/products/detail/molex/5034801000/2356624
FPC 10Pin Cable $3.74 https://www.digikey.com/en/products/detail/molex/0152660095/3160830
1N4148WTPMSCT-ND Diode $0.03816 https://www.digikey.com/en/products/detail/micro-commercial-co/1N4148W-TP/717196
PTS810SJK250SMTRLFS $0.36 https://www.mouser.com/ProductDetail/611-PTS810SJK250SMTR
Keyboard Module PCB $51.58

NumPad Module

The numpad module is responsible for numerical input, as well as mathmatical operations. This is handled by a 7x3 button matrix.

NumPad Module Schematic
NumPad Module KiCAD Schematic.
NumPad Module PCB
NumPad Module PCB Routing and Component Placement.
NumPad Module 3D PCB
3D Render of NumPad Module PCB.

NumPad BOM

NumPad module PCB manufactured by PCBway's PCB fabrication service. The following table details the components used within the module, along with information on pricing for the actual PCB.

Component Cost Link
KSA1M331LFT SPST-NO $0.91 https://www.digikey.com/en/products/detail/c-k/KSA1M331LFT/1003897
Tactile Cap Oval (BLACK) $0.39 https://www.digikey.com/en/products/detail/c-k/BTNK0390/559405
FPC 10Pin Connector $1.13 https://www.digikey.com/en/products/detail/molex/5034801000/2356624
1N4148WTPMSCT-ND Diode $0.03816 https://www.digikey.com/en/products/detail/micro-commercial-co/1N4148W-TP/717196
NumPad Module PCB $38.18

Joystick Module

The joystick/d-pad module is responsible for mouse movement. Mouse movement is handled by a joystick, arrow key movement is handled by switches under a directional pad.

Joystick/D-Pad Module Schematic
NJoystick/D-Pad Module KiCAD Schematic.
Joystick/D-Pad Module PCB
Joystick/D-Pad Module PCB Routing and Component Placement.
Joystick/D-Pad Module 3D PCB
3D Render of Joystick/D-Pad Module PCB.

Joystick BOM

NumPad module PCB manufactured by PCBway's PCB fabrication service. The following table details the components used within the module, along with information on pricing for the actual PCB.

Component Cost Link
KSA1M331LFT SPST-NO $0.91 https://www.digikey.com/en/products/detail/c-k/KSA1M331LFT/1003897
FPC 10Pin Connector $1.13 https://www.digikey.com/en/products/detail/molex/5034801000/2356624
1N4148WTPMSCT-ND Diode $0.03816 https://www.digikey.com/en/products/detail/micro-commercial-co/1N4148W-TP/717196
Mini Analog Thumbstick $2.50 https://www.adafruit.com/product/2765?gclid=CjwKCAjw6raYBhB7EiwABge5Kk9TZn8ilWmRzUdasBMNh74FXIZQBJh3K6sDLgbHT71pnA3cYCJrNRoC1E8QAvD_BwE
Joystick/D-Pad Module PCB $38.18

Footnotes

  1. https://www.pcbway.com/rapid-prototyping/3D-Printing/3D-Printing-SLA.html

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