Stm32G474RETx template
Stm32G474RETx template is an open source STM32 PCB design by modern-hobbyist: a 2-layer, 134.5 × 76 mm board with 46 components (20 distinct parts). It is built around the PRTR5V0U2X, XC6206PxxxMR-Regulator_Linear, CR2013-MI2120, STM32G474RETx. Filed under keyboards and displays & leds.
Collection of KiCad PCB designs for custom keyboards, including full-sized and split ergonomic layouts with STM32F072CBT6 microcontrollers.
Hermod Mk. II is a redesign of my original Hermod split keyboard, which in turn was my second keyboard design ever! Some issues that were resolved in this version include: - Better Pin choices for PWM Channels, Mk. I had some issues with timers overlapping - Added a handedness pin - Allows me to avoid using flash to store handedness - Switched to Full Duplex split comms - Mk.I was missing a 5.1kΩ resistor on the split serial line and this switched fixes that. - Switched to STM32G474CETx from the STM32F072CBT6 - More Ram, more flash, more fun. Didn't have enough ram for fun graphics on the LCD…
Built around
Parts list
46 components, 20 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PRTR5V0U2X | SOT-143 | U2 |
| 1 | XC6206PxxxMR-Regulator_Linear | SOT-23 | U3 |
| 1 | CR2013-MI2120 | CR2013-MI2120 | U4 |
| 1 | STM32G474RETx | LQFP-64_10x10mm_P0.5mm | U5 |
| 1 | MMUN2133LT1G | SOT-23-3 | Q3 |
| 1 | USB_C_Receptacle_USB2.0 | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | Conn_01x05 | PinHeader_1x05_P2.54mm_Vertical | J2 |
| 4 | KS33_SW_HS | KS-33_MX-Hotswap-1U | CH1, CH2, CH15, CH16 |
| 1 | 500mA | Fuse_1206_3216Metric | F1 |
| 1 | DFU | SW_SPST_TL3342 | RESET1 |
| 4 | choc_SK6812MINI-E | LED_choc_6028R | LED1, LED2, LED13, LED14 |
| 4 | D | D_SOD-123 | D1, D2, D15, D16 |
| 2 | 1N4148 | D_SOD-123 | D40, D41 |
| 4 | 0.1uF | C_0402_1005Metric | C1, C2, C13, C14 |
| 8 | 100nF | C_0402_1005Metric | C104, C105, C106, C107, C108, C109, C110, C129 |
| 3 | 100n | C_0805_2012Metric | C120, C121, C130 |
| 2 | 1uF | C_0402_1005Metric | C127, C128 |
| 3 | 5.1k | R_0402_1005Metric | R1, R2, R5 |
| 1 | 120 | R_0805_2012Metric | R7 |
| 2 | 68k | R_0805_2012Metric | R8, R9 |
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