Add DonConPad Readme

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Frederik Walk 2023-08-09 23:55:17 +02:00
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Additional controller buttons and the display are attached to the same (or different if your board has more than one) i2c bus. For the display, use a standard SSD1306 OLED display with 128x64 resolution. The buttons need to be attached to a MCP23017 IO expander.
See [DonConPad](/pcb/DonConPad/) for a exemplary gamepad pcb.
Mind that currently the display and buttons are mandatory to use the controller.
### Physical construction

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MIT License
Copyright (c) 2023 Frederik Walk
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the “Software”), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# DonConPad - A Simple I2C Gamepad with Display
This board breaks out an MCP23017 I/O expander to some conveniently placed push buttons and offers a spot for an SSD1306 OLED display.
Both I/O expander and display are connected to the same i2c bus.
The i2c address for the MCP23017 can be configured using the jumpers JP1, JP2 and JP3, which are pulled down to GND when open.
![DonConPad PCB](board.jpg)
## Bill of Materials
| **Reference** | **Description** | **Digikey Part** | **Notes** |
| ---------------------- | :-------------------------: | :--------------------------: | :-----------------------------------------------------------------------: |
| J1 | SSD1306 OLED Display Module | - | Dimension wise 128x64 or 128x32 should fit. Make sure the pinout matches. |
| U1 | MCP23017 IO Expander | MCP23017-E/SO-ND | |
| SW1-14 | 6x6mm Tactile Switch | e.g. TS02-66-60-BK-100-LCR-D | |
| C1 | 0.1µF SMD Ceramic Capacitor | 1276-1003-1-ND | |
| C2 | 10µF SMD Ceramic Capacitor | 1276-6454-1-ND | |
| R1, R2, R3, R4, R5, R6 | 10kΩ SMD Resistor | 2019-RK73H2ATTD1002FCT-ND | |

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