Releases: lambdakb/trackball-lt7dk
Releases · lambdakb/trackball-lt7dk
v1.00 (2025-02-04)
PCB
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You can preview the project files for this release using KiCanvas.
BOM
| Part | Ref. | Quantity | Optional | Remarks |
|---|---|---|---|---|
| PCB | LT7DK PCB | 1 | ❌ | See PCB section on how to order it. |
| Pro Micro Controller | Arduino Pro Micro 5V, Adafruit KB2040 or nice!nano | 1 | ❌ | Supports various Pro Micro style controller (including RP2040 based ones) as well as the nice!nano for wireless builds. 1 |
| MCU Socket | DIP-24 Round Socket (Wide, 15.24 mm) | 1 | ✅ | Recommended to socket the controller, can be omitted if soldered directly. Compatibles pins are required such as dismantled LED strip male adapters. |
| Reset Push Button | DIP 2pin Momentary Push Button (6 × 3.5 mm) | 1 | ✅ | Used as a reset switch, can be omitted if you flash the controller before installing it or if the controller can be put in bootloader mode from any other means. |
| Micro Switches | D2FC-F-7N Micro Switch or compatible | 4-7 | ❌ | Micro switches for mouse buttons, you do not have to populate all of them depending on how you intend to use the PCB. |
| PMW3360 Optical Sensor & Lens | PMW3360DM-T2QU + LM19-LSI | 1 | ❌ | Optical mouse sensor and lens used to detect trackball movement. |
| 1.8V DO | TPS76318 Fixed 1.8V LDO (SOT-23-5) | 1 | ❌ | Power regulator for optical sensor. |
| 1uF Capacitor | 0805 SMD Ceramic Capacitor | 1 | ❌ | Required by the optical sensor LDO. |
| 4.7uF Capacitors | 0805 SMD Ceramic Capacitor | 2 | ❌ | Power filtering capacitor for optical sensor and required LDO. |
| 100nF Capacitors | 0805 SMD Ceramic Capacitor | 1-2 | ❌ | One if required for power filtering of the optical sensor, the second one is only required if installing the NeoPixel RGB LED. |
| 10K Ω Resistor | 0805 SMD Resistor | 1 | ❌ | Required by the optical sensor. |
| 39 Ω Resistor | 0805 SMD Resistor | 1 | ❌ | Required by the optical sensor. |
| 0.91" OLED Display | SSD1306 0.91" 128X32 OLED I²C Display Module | 0-1 | ✅ | Optional, not recommended for wireless builds. 1 |
| NeoPixel RGB LED | WS2812B 5050 SMD RGB LED or SK6812 5050 SMD RGBW LED | 0-1 | ✅ | Optional, MUST NOT be placed on wireless builds as 5V output is not provided on the RAW pin by the controller. 1 |
| Power Slide Switch | PCM12SMTR or MSK-12C02 | 1 | ✅ | Only required for battery powered wireless builds. 1 |
| Battery Connector | JST-PH 2pin right-angle Male Connector | 1 | ✅ | Only needed for battery powered wireless builds if the battery is not soldered directly to the board (recommended). 1 |
Changelog
Full Changelog: https://github.com/lambdakb/trackball-lt7dk/commits/v1.00