
Racer
StuckAtPrototype/Racer
These are structured into their own files. I could have used submodules, but decided against it.

A 4ch bidirectional logic level converter
CoreElectronics Logic Level Converter Bidirectional is an open-source printed circuit board by CoreElectronics, from the CoreElectronics/CoreElectronics-Logic-Level-Converter-Bidirectional repository on GitHub. It is a 2-layer board of 15.2 × 12.7 mm with 19 parts on 11 nets, routed with 94 tracks and 1 via.
It is built around the BSS138. Its parts include 8 resistors and 4 transistors.

This Bi-Directional Logic Level Converter is a breadboard-friendly device that converts between eg. 5V and 3.3V logic. The four channels are independent and work in both directions, making this converter appropriate for shifting I2C bus voltages.
Power the board from the two voltage sources you're using. Connect the higher voltage (eg. 5V) to the 'HV' power pin, the lower voltage (eg. 3.3V) to the 'LV' power pin, and the ground to the 'GND' pin.
Features:
This project is open source - please review the LICENSE.md file for further licensing information.
If you have any technical questions, or concerns about licensing, please contact technical support on the Core Electronics forums.
The hardware design of this module is influenced by the design from Sparkfun.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6, R7, R8 |
| 4 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4 |
| 2 | FIDUCIALUFIDUCIAL | Fiducial:Fiducial_0.5mm_Mask1mm | JP2, JP3 |
| 1 | HV | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | JP4 |
| 1 | LOGO | core-logo:core-logo | G1 |
| 1 | LOGO_made-with-love | datamatrix:CE07510 | G2 |
| 1 | LV | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | JP1 |
| 1 | Logo_Open_Hardware_Small | core-logo:oshw | LOGO1 |

StuckAtPrototype/Racer
These are structured into their own files. I could have used submodules, but decided against it.

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It measures 15.2 × 12.7 mm and has 2 copper layers, 1.6 mm thick.
19 parts, built around the BSS138. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the CoreElectronics/CoreElectronics-Logic-Level-Converter-Bidirectional repository on GitHub, at the commit this page was made from: the board is PCB/CoreElectronics-Logic-Level-Converter-Bidirectional.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask CoreElectronics before reusing the design.