KnurDash
About the KnurDash PCB
KnurDash is an open source PCB design by chrumck, published on GitHub under the MIT license. It is a 2-layer board measuring 55 × 34 mm, with 23 components from 15 distinct parts.
Other key parts include the LONGAN_I2C_CAN and LM2903. By type, the board carries 9 resistors, 3 transistors, 3 diodes, 3 capacitors, 2 ICs and 2 connectors.
It belongs with the sensors, iot & wireless and displays & leds designs in this gallery.
From the project
A racing logger for an ND2 Mazda MX-5, integrating wide ranging functionality into one unit:
A racing logger for an ND2 Mazda MX-5, integrating wide ranging functionality into one unit:
- Reading analog sensors (oil pressure and temperature, rotor temperature) - Reading CANBUS data (coolant and intake temperature, RPM, etc.) - Displaying data in a clear and aesthetically pleasing way - Making data available via Bluetooth as RaceChrono DIY BLE device
The system has two main components, the display unit and the sensor unit. The communication between the two is executed through I2C protocol (1.2m cable is pushing it though. With careful cable prep I still get ~0.5% error rate on…
Main components on the KnurDash
KnurDash bill of materials (BOM)
23 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LONGAN_I2C_CAN | Longan_I2C_CAN | U1 |
| 1 | LM2903 | DIP-8_W7.62mm | U2 |
| 1 | 2N7000 | TO-92_Inline_Wide | Q1 |
| 1 | BC547 | TO-92_Inline_Wide | Q2 |
| 1 | BS250 | TO-92_Inline_Wide | Q3 |
| 1 | Conn_01x07 | SolderWire-1x07-d1.5 | J1 |
| 1 | Conn_01x05 | PinHeader_1x05_P2.54mm_Vertical | J2 |
| 1 | COMUS_3572.1220.X4 | Relay_COMUS_DIP | K1 |
| 1 | 4.3V | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 2 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D2, D3 |
| 1 | 100n | C_Disc_D3.8mm_W2.6mm_P2.50mm | C1 |
| 2 | 1uF | CP_Radial_D5.0mm_P2.50mm | C2, C3 |
| 7 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R5, R6, R7, R8 |
| 1 | 68k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 120 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
KnurDash design files
The KiCad project lives in the chrumck/KnurDash repository on GitHub; these links point at the commit this page was built from.
KnurDash: common questions
How big is the KnurDash PCB?
The KnurDash measures 55 × 34 mm, has 2 copper layers and is 1.69 mm thick.
How many components are on the KnurDash?
23 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the KnurDash design files?
From the chrumck/KnurDash repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the KnurDash design in my own project?
Yes, under the terms of its MIT license, which chrumck chose for the repository.
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