2 layers71.8 × 26 mm
Dac attack
saybur/dac-attack
S/PDIF to line-level audio board for use with retro computer device emulators, such as ZuluSCSI and friends.
69 parts5CERN-OHL-S-2.0
4 layers90 × 70 mm
InclinationMeter
soldernerd/InclinationMeterA battery-powered, Bluetooth-enabled precision electronic level instrument for machine tool geometry inspection and granite surface plate qualification.
- Size
- 90 × 70 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 118
- Nets
- 130
- Pads
- 463
- Tracks, vias
- 1,098, 329
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 23 Apr 2026
- Updated
- 12 Jun 2026
Overview
InclinationMeter is an open-source printed circuit board by soldernerd, from the soldernerd/InclinationMeter repository on GitHub. It is a 4-layer board of 90 × 70 mm with 118 parts on 130 nets, routed with 1,098 tracks and 329 vias.
It is built around the STM32G0B1RET6, RN4871-I/RM128 and BME280, with the SD6210A, LP5907MFX-3.3/NOPB(MS) and 24LC256-I/ST among its other parts. Its parts include 43 capacitors, 37 resistors, 12 ICs, 7 connectors and 5 transistors. It belongs with the STM32 boards of this library.
Main components
12
STM32G0B1RET6
LQFP-64(10x10)-40℃~+85℃ 1.7V~3.6V 144KB 32 Bit 512KB 60 64MHz ARM Cortex-M0+ Built-in+External FLASH LQFP-64(10x10) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
RN4871-I/RM128
SMD,11.5x9mm0dBm OTA (Over-The-Air) upgrade、Encryption function SPI、UART、I2C SMD,11.5x9mm Bluetooth Modules ROHSMicrochip TechnologyRF Transceiver ICs
BME280
LGA-8(2.5x2.5)-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 1.8uA 16bit I2C、SPI ±0.5℃ ±3%RH LGA-8(2.5x2.5) Temperature and Humidity Sensor ROHSBoschTemperature And Humidity Sensor
SD6210A
SOT-23-60℃~+70℃ 1.2MHz 2.8V~5V 250mA 4.8V~5.2V 83% boost converter SOT-23-6 Charge Pumps ROHSSHOUDINGCharge Pumps
LP5907MFX-3.3/NOPB(MS)
SOT-23-5-40℃~+125℃@(Tj) 1 180mV@(300mA) 2uA 3.3V 300mA 5.5V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
24LC256-I/ST
TSSOP-8-40℃~+85℃ 1,000,000 cycles 2.5V~5.5V 200 Years 256Kbit 400kHz 5ms Hardware write protection function、Noise suppression function I2C TSSOP-8 EEPROM ROHSMicrochip TechnologyEEPROMDW01A
SOT-23-6L-40℃~+85℃ 1 2.5V 300mV~10V 3uA 4.3V Protection IC Support SOT-23-6L Battery Management ROHSPUOLOPBattery Management
LM35
TO-92UncategorisedSilicore
SN74HC14PWR-TP
TSSOP-14-40℃~+125℃ 1.5V、1.9V、2.2V、2.4V、3.8V 100mV、300mV、400mV、450mV、550mV、550mV 10uA 2V~6V 3.5ns@5V,15pF 6 74HC Schmitt trigger TSSOP-14 Inverters ROHSTECH PUBLICInverters
TP4056
ESOP-8-40℃~+85℃ 1 1A 35uA 4.2V 4V~6.5V Charging IC Lithium Battery Support Support 恒流充电、恒压充电、涓流充电、自动再充电、充电终止、可编程充电电流、软启动、欠压锁定 ESOP-8 Battery Management ROHSUMWBattery Management
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
CC1206KKX7R8BB106
120610uF 25V X7R ±10% 1206 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdInclination Meter
A battery-powered, Bluetooth-enabled precision electronic level instrument for machine tool geometry inspection and granite surface plate qualification.
Overview
The instrument combines a MEMS 3-axis inclinometer (Murata SCL3300) with a high-resolution pendulum-based capacitive sensor (Sciosense PCAP04), a 2.7" Sharp Memory LCD display, and a Bluetooth Low Energy interface to a companion Windows application. All precision sensing is mechanically coupled directly to a cast iron reference base, isolated from the plastic enclosure.
Hardware
| Parameter | Value |
|---|---|
| MCU | STM32G0B1RET6 (Cortex-M0+, 64 MHz, 512 KB flash) |
| Display | Sharp LS027B7DH01, 2.7", 400x240 monochrome |
| Connectivity | Bluetooth LE 5.0 (Microchip RN4871) |
| USB | USB-C Full Speed - charging + HID + DFU bootloader |
| Battery | 1S LiPo 1000 mAh, ~20 h runtime |
| Supply | 3.3 V main rail, 5 V display rail |
| MEMS range | +/-90 deg |
| Pendulum range | +/-1 mm/m |
| Pendulum resolution | ~0.001 um/m |
Physical Architecture
Three PCBs:
- Main board - MCU, power management, display, BLE, user interface
- SCL3300 daughter board - 3-axis MEMS inclinometer, mounted to cast iron base
- PCAP04 daughter boards x2 - capacitive pendulum readout, one per axis
Repository Structure
KiCad/ KiCad 10 schematic and PCB files
docs/ KiCad file format and schematic reference notes
spec.md Full hardware design specification
Netlist.md Schematic netlist / connection listKiCad Library
All symbols and footprints use sldrnrd_kicad_lib. Clone it as a sibling of this repository:
EmbeddedSystems/
├── InclinationMeter/ ← this repo
└── sldrnrd_kicad_lib/ ← library repoFirmware
Developed with STM32CubeIDE. Firmware update via USB DFU bootloader (no external programmer required after initial flash).
Status
Hardware design in progress - schematic phase.
Parts
118| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | 100n | sldrnrd:C_0603 | C2, C3, C11, C12, C13, C17, C18, C23, C26, C27, C28, C30, C32, C34, C35, C36 +8 |
| 15 | 33k | sldrnrd:R_0603 | R5, R9, R12, R13, R14, R15, R16, R17, R20, R21, R22, R23, R24, R25, R34 |
| 8 | 5k1 | sldrnrd:R_0603 | R18, R19, R27, R29, R32, R33, R35, R36 |
| 6 | 10u | sldrnrd:C_1206 | C4, C5, C7, C9, C10, C14 |
| 5 | 1k | sldrnrd:R_0603 | R3, R6, R7, R10, R11 |
| 4 | 100k | sldrnrd:R_0603 | R1, R8, R28, R31 |
| 4 | 10n | sldrnrd:C_0603 | C24, C25, C31, C33 |
| 4 | 2k | sldrnrd:R_0603 | R2, R4, R26, R37 |
| 4 | MountingHole_Pad | sldrnrd:MountingHole_3.2mm | H1, H2, H3, H4 |
| 3 | 1u | sldrnrd:C_0805 | C1, C6, C16 |
| 2 | 15p | sldrnrd:C_0603 | C19, C20 |
| 2 | 2u2 | sldrnrd:C_0805 | C15, C29 |
| 2 | 33p | sldrnrd:C_0603 | C21, C22 |
| 2 | AO3400A | sldrnrd:SOT-23-3 | Q4, Q5 |
| 2 | DMG2305UX-13 | sldrnrd:SOT-23-3 | Q1, Q3 |
| 2 | Header_FFC_1.0mm_10 | sldrnrd:Header_FFC_1.0mm_10 | J5, J6 |
| 2 | LED_Green_0603 | sldrnrd:LED_0603 | D2, D3 |
| 2 | LP5907MFX-3.3/NOPB | sldrnrd:SOT-23-5 | U2, U4 |
| 2 | PEC11R-4215F-S0024 | sldrnrd:RotaryEncoder_PEC11R | SW1, SW2 |
| 1 | 24LC256-I/ST | sldrnrd:TSSOP-8 | U9 |
| 1 | 68k | sldrnrd:R_0603 | R30 |
| 1 | BME280 | sldrnrd:LGA-8_2.5x2.5mm_P0.65mm | U10 |
| 1 | CPT-9019A-SMT-TR | sldrnrd:CPT-9019A | BZ1 |
| 1 | DW01A | sldrnrd:SOT-23-6 | U1 |
| 1 | FS8205A | sldrnrd:TSSOP-8 | Q2 |
| 1 | Header_50mil_2x07 | sldrnrd:Header_50mil_2x07 | J4 |
| 1 | Header_FFC_1.0mm_06 | sldrnrd:Header_FFC_1.0mm_06 | J3 |
| 1 | JST_PH_2.0mm_1x02 | sldrnrd:JST_PH_2.0mm_1x02 | J1 |
| 1 | JST_PH_2.0mm_1x03 | sldrnrd:JST_PH_2.0mm_1x03 | J7 |
| 1 | LED_Red_0603 | sldrnrd:LED_0603 | D1 |
| 1 | LED_Yellow_0603 | sldrnrd:LED_0603 | D4 |
| 1 | LM35 | sldrnrd:SOT-23-3 | U12 |
| 1 | LS027B7DH01 | sldrnrd:Display_LS027B7DH01 | DS1 |
| 1 | Q13FC1350000400 | sldrnrd:CRYSTAL-3215 | Y1 |
| 1 | RN4871-I/RM128 | sldrnrd:RN4871 | U7 |
| 1 | SD6210A | sldrnrd:SOT-23-6 | U5 |
| 1 | SN74AHCT244DBR | sldrnrd:SSOP-20 | U8 |
| 1 | SN74HC14PWR | sldrnrd:TSSOP-14 | U11 |
| 1 | STM32G0B1RET6 | sldrnrd:LQFP-64 | U6 |
| 1 | TP4056 | sldrnrd:ESOP-8 | U3 |
| 1 | USB_C | sldrnrd:USB_C | J2 |
| 1 | X50328MSB2GI | sldrnrd:CRYSTAL-3225 | Y2 |
Questions
How big is the InclinationMeter PCB?
It measures 90 × 70 mm and has 4 copper layers, 1.6 mm thick.
What parts does the InclinationMeter use?
118 parts, built around the STM32G0B1RET6, RN4871-I/RM128, BME280 and SD6210A. 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.
Where can I download the InclinationMeter KiCad files?
From the soldernerd/InclinationMeter repository on GitHub, at the commit this page was made from: the board is KiCad/InclinationMeter.kicad_pcb and its schematic KiCad/InclinationMeter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the InclinationMeter design in my own project?
Its repository states no licence, so its author keeps all rights: ask soldernerd before reusing the design.
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