Gravi dot
About the Gravi dot PCB
Gravi dot is an open source ESP32 PCB design by jayis1, published on GitHub. It is a board, with 24 components from 24 distinct parts.
Its main chip is the ESP32-C3-MINI-1, from the ESP32 family. Other key parts include the STM32G474RET6, AD8331ARZ, LMG1210RVRT, LM5022MM and MD0100. By type, the board carries 11 ICs, 3 switches, 3 LEDs, 2 crystals, 2 connectors and 1 module.
From the project
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KiCad 7+ project files for the Gravi Dot portable relative gravimeter.
- 4-layer PCB: signal / GND / 3V3 / signal - 50×50 mm board size - Minimum trace: 0.15 mm (6 mil) - Minimum via: 0.4 mm diameter, 0.2 mm drill - ENIG finish for fine-pitch components (LCC-14 ADXL355)
1. ADXL355 on daughterboard — the gravity sensor is on a separate 15×15 mm PCB inside a copper thermal mass, connected via FFC. This isolates it from main-board thermal gradients and vibration. 2. SPI1 bus sharing — ADXL355 and SCL3300 share SPI1 with separate CS lines. The ADXL355 has priority (higher sample rate). The…
Main components on the Gravi dot
Gravi dot bill of materials (BOM)
24 components, 24 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32G474RET6 STMicroelectronics | LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | ESP32-C3-MINI-1 Espressif | ESP32-C3-MINI-1 | U2 |
| 1 | AD8331ARZ ADXL355BCCZ Analog Devices | LCC-14 | U3 |
| 1 | LMG1210RVRT SCL3300-D01 Texas Instruments | U4 | |
| 1 | LM5022MM MS5837-02BA Texas Instruments | U5 | |
| 1 | MD0100 NEO-M9N Microchip | U6 | |
| 1 | MAX17048G+T10 SH1106 1.3in Maxim/Analog | U7 | |
| 1 | TP4056 MCP73831T-2ACI NanJing Top Power | U8 | |
| 1 | TPS63020DSJR Texas Instruments | U9 | |
| 1 | SSD1306-128X64-SPI TPS63031DSKR Solomon SSD1306 | U10 | |
| 1 | DRV8833PWP | U11 | |
| 1 | TEC1-03004 | M1 | |
| 1 | SCT2H12NZ DS18B20 GaN Systems | Q1 | |
| 1 | ABM8-8.000MHZ 8MHz Abracon | Y1 | |
| 1 | ABS07-32.768KHZ 32.768kHz Abracon | Y2 | |
| 1 | USB-C LEMO | J1 | |
| 1 | 12401548E4022 microSD Amphenol | J2 | |
| 1 | PEC11R-4220F-S0024 EC11 Bourns | ENC1 | |
| 1 | SKQGAFE010 STATION ALPS | SW1 | |
| 1 | SKQGAFE010 BASE ALPS | SW2 |
Show 4 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SKQGAFE010 MENU ALPS | SW3 | |
| 1 | APT2012SRCPRV GREEN Kingbright | LED1 | |
| 1 | APT2012SRCPRV RED Kingbright | LED2 | |
| 1 | APT2012SRCPRV BLUE Kingbright | LED3 |
Gravi dot design files
The KiCad project lives in the jayis1/SoC-Device-Inventions repository on GitHub; these links point at the commit this page was built from.
Gravi dot: common questions
What microcontroller does the Gravi dot use?
The Gravi dot is built around the ESP32-C3-MINI-1, from the ESP32 family.
How many components are on the Gravi dot?
24 components, from 24 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Gravi dot design files?
From the jayis1/SoC-Device-Inventions repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Gravi dot design in my own project?
The repository has no license, so all rights stay with jayis1. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Gravi dot without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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