OLED remote mount for Nullbits Scramble

prusaprinters

<p>Nullbits has a 6 switch macropad with options for encoder and OLED ( 128 x 32 ).</p><p>The scramble PCB layout however locates the I2C ( for the OLED ) through-hole vias in a location that if populated directly (i.e mounted onto PCBA ) will prevent access to install two of the key switches. &nbsp;I wanted to retain the use of these switches. So I created this solution which remote mounts the OLED over the USB port. It is meant to replace the bottom FR4 board that comes with the scramble.&nbsp;</p><p>This solution will require effectively replacing the 4-pin 2.54mm header provided with the OLED with a wired solution.</p><p>EDIT: Added optional 128x64 oled screen version.&nbsp;</p><h3><strong>Print instructions</strong></h3><p><strong>Resolution:</strong> 0.2</p><p><strong>Infill:</strong> 100%</p><p><strong>Supports: Yes ( maybe , depends on bridging ). Should only be needed on framing portion for OLED display.</strong></p><p>NOTE: Print on side, where slot for 90 degree header is orientated towards the top</p><p>&nbsp;</p><h3>BOM:</h3><ol><li>Scramble macropad</li><li>OLED for scramble</li><li>This model printed</li><li>4-pin 90 degree 2.54mm header</li><li>4-pin 2.54mm female to female dupont cable</li><li>(optional) heatshrink</li><li>(optional) braid</li></ol><p>&nbsp;My approach was to :</p><ol><li>Solder the 4-pin 90 degree 2.54mm header onto the OLED with the pins orientated across the OLED PCBA</li></ol><figure class="image"><img src="https://media.prusaprinters.org/media/prints/77298/rich_content/6ec96dd3-7aa3-455a-8b06-2d8c97ff2f01/aec4b59a-8aaf-4b9a-8e82-ab1c5073c038.jpeg#%7B%22uuid%22%3A%2216c1cb6d-1b7e-41fd-8ef9-442d5f6556c3%22%2C%22w%22%3A3024%2C%22h%22%3A4032%7D"></figure><p>2. Place assembly into the OLED mount on the print</p><figure class="image"><img src="https://media.prusaprinters.org/media/prints/77298/rich_content/6cac23e0-168b-40b0-97b4-2c2949fa8a1c/28833539-bd9f-42cc-9454-a4d36ca1bfd9.jpeg#%7B%22uuid%22%3A%22b2b50885-bd67-4005-993b-f7a5125606bf%22%2C%22w%22%3A4032%2C%22h%22%3A3024%7D"></figure><p>3. Cut dupont cable to length. &nbsp;( approx 11.5 cm fro tip of connector to end of wire )</p><figure class="image"><img src="https://media.prusaprinters.org/media/prints/77298/rich_content/53428ea9-9811-4f8b-a469-34fd3d54c031/87067822-d79d-434a-ad82-bcef0677f5f9.jpeg#%7B%22uuid%22%3A%2247f8dadd-883e-44bc-8c74-cfde3bfbb120%22%2C%22w%22%3A4032%2C%22h%22%3A3024%7D"></figure><p>( NOTE: Attach optional heatshrink and braiding at this point , if you are using any )</p><p>3. Solder dupont cable ends to VCC, GND, SDA and SCL.</p><ol><li>Note order of cabling , this will need to match the order on the OLED</li><li>I used the following color code corresponding to the cable I purchased and the orientation of the signals on the header:<ol><li>White - GND ( usually denoted with a triangle on the connector )</li><li>Yellow - VCC</li><li>Black - SCL</li><li>Red - SDA</li></ol></li><li>Run cable between the underside of the scramble PCBA and the print.</li></ol><figure class="image"><img src="https://media.prusaprinters.org/media/prints/77298/rich_content/645d5c81-beea-40c7-925b-62f49c2acc7c/2d893214-e544-4528-95d8-ca5981f1fbaf.jpeg#%7B%22uuid%22%3A%226adb10b2-ab06-4c40-bc06-d0205d9510aa%22%2C%22w%22%3A4032%2C%22h%22%3A3024%7D"></figure><p>4. Attach the female connector to the 4-pin 90 degree header.</p><ol><li>Make sure to place pin 1 ( GND) onto GND header pin ( silked on the Nullbits branded OLED , YMMV )</li></ol><p>&nbsp;</p>