2 layers25.4 × 17.8 mm
Adafruit LSM303AGR
Granterson/PCB---Digital-Compass
The planning, design, and manufacture process of my digital compass project
25 parts
4 layers30.5 × 31.3 mm
Compass Design
Granterson/PCB---Digital-CompassThe planning, design, and manufacture process of my digital compass project
- Size
- 30.5 × 31.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 68
- Pads
- 154
- Tracks, vias
- 263, 70
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 Apr 2026
- Updated
- 16 Apr 2026
Overview
Compass Design is an open-source printed circuit board by Granterson, from the Granterson/PCB---Digital-Compass repository on GitHub. It is a 4-layer board of 30.5 × 31.3 mm with 48 parts on 68 nets, routed with 263 tracks and 70 vias.
It is built around the MMBT3904. Its parts include 17 resistors, 9 diodes, 8 transistors, 6 capacitors and 2 ICs. It belongs with the STM32 boards of this library.
Main components
1README
README.mdPCB---Digital-Compass
The planning, design, and manufacture process of my digital compass project
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 330 | Resistor_SMD:R_0805_2012Metric | R2, R4, R6, R8, R10, R12, R14, R16, R19 |
| 8 | 4.7k | Resistor_SMD:R_0805_2012Metric | R1, R3, R5, R7, R9, R11, R13, R15 |
| 8 | LED | LED_SMD:LED_1206_3216Metric | D1, D2, D3, D4, D5, D6, D7, D8 |
| 8 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 |
| 2 | 12.5pF | Capacitor_SMD:C_0805_2012Metric | C4, C5 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C11 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | AZ1117CH2-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | BatteryConnector | TerminalBlock:CONN_OSTTC022162_OST | J1 |
| 1 | Conn_ST_STDC14 | Connector_PinHeader_1.27mm:PinHeader_2x07_P1.27mm_Vertical_SMD | J4 |
| 1 | Crystal | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | GREEN LED | LED_SMD:LED_1206_3216Metric | D9 |
| 1 | LOGO | LOGO | G*** |
| 1 | LSM303Pinout | my-footprints:PinSocket_Combo_1x06_1x04_P2.54mm | adafruit1 |
| 1 | STM32G031K8Tx | Package_QFP:LQFP-32_7x7mm_P0.8mm | U3 |
| 1 | SW_SPST | Button_Switch_THT:SW_DIP_SPSTx01_Slide_6.7x4.1mm_W7.62mm_P2.54mm_LowProfile | SW1 |
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Questions
How big is the Compass Design PCB?
It measures 30.5 × 31.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Compass Design use?
48 parts, built around the MMBT3904. 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 Compass Design KiCad files?
From the Granterson/PCB---Digital-Compass repository on GitHub, at the commit this page was made from: the board is pcb/Compass_Design/Compass_Design.kicad_pcb and its schematic _research/AdafruitKiCad Scheme/Adafruit_LSM303AGR.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Compass Design design in my own project?
Its repository states no licence, so its author keeps all rights: ask Granterson before reusing the design.