Torn left
About the Torn left PCB
Torn left is an open source AVR/Arduino PCB design by rtitmuss, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 140.8 × 115.7 mm, with 68 components from 21 distinct parts.
Its main chip is the ATMEGA328-PU, from the AVR/Arduino family. By type, the board carries 24 diodes, 22 switches, 8 resistors, 5 capacitors, 1 IC and 1 crystal.
It belongs with the keyboards designs in this gallery.
From the project
Torn keyboard
The split keyboard kit made with through hole components. The design has been inspired by the Corne, Plaid and Discipline keyboards.
Torn uses an Atmega328P cpu, running QMK with VUSB: - QMK firmware. - Bootloader. - Compatible with VIA
Later this year you will be able to buy a Torn keyboard kit from splitkb.com. Alternatively you can also buy all the parts needed youself.
Main components on the Torn left
Torn left bill of materials (BOM)
68 components, 21 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATMEGA328-PU | DIP-28_W7.62mm_Socket | U1 |
| 1 | 16MHz | Crystal_HC49-4H_Vertical | Y1 |
| 1 | SJ-43514 | CUI_SJ-43514 | J1 |
| 1 | 100mA | polyfuse_5.1mm | F1 |
| 1 | AVR_ISP_6 | AVR_ICSP_3x2 | ISP1 |
| 1 | RESET | SW_PUSH_6mm | PB1 |
| 1 | BOOT | SW_PUSH_6mm | PB2 |
| 1 | SYM_Arrow45_Small | Tenting_Puck | PUCK1 |
| 19 | SW_Push | Kailh_socket_MX_PG1350_optional | SW1, SW2, SW3, SW4, SW5, SW7, SW8, SW9 +11 |
| 3 | Rotary_Encoder_Switch | Kailh_socket_MX_PG1350_EC11_optional | SW6, SW19, SW22 |
| 1 | USB_C_GCT_USB4085-Type-C | USB_C_GCT_USB4085 | USB1 |
| 22 | 1N4148 | D_DO-35_SOD27_P5.08mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8 +14 |
| 2 | 3.6V | D_DO-35_SOD27_P5.08mm_Horizontal | D50, D51 |
| 2 | 22p | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2 |
| 1 | 4.7u | CP_Radial_D4.0mm_P1.50mm | C3 |
| 2 | 100n | C_Disc_D4.3mm_W1.9mm_P5.00mm | C4, C5 |
| 1 | 1.5k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 2 | 75R | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2, R3 |
| 2 | 5.1k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R4, R5 |
| 1 | 10k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R6 |
Show 1 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 2.2k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R7, R8 |
Torn left design files
The KiCad project lives in the rtitmuss/torn repository on GitHub; these links point at the commit this page was built from.
Torn left: common questions
What microcontroller does the Torn left use?
The Torn left is built around the ATMEGA328-PU, from the AVR/Arduino family.
How big is the Torn left PCB?
The Torn left measures 140.8 × 115.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Torn left?
68 components, from 21 distinct parts. The full bill of materials is listed on this page.
Where can I download the Torn left design files?
From the rtitmuss/torn repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Torn left design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
Can I test firmware for the Torn left without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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