# BigTreeTech ADXL345 V2.0 Accelerometer Board

> RP2040-based ADXL345 accelerometer board for Klipper input shaping and resonance compensation on 3D printers. Connects via USB Type-C with ESD protection. Board size: 33.25 × 15.5mm.

## Quick Facts

- **Brand:** BigTreeTech
- **Board Type:** sensor-module
- **Price:** ~$9.99
- **Product Readiness:** consumer
- **CPU:** RP2040
- **CPU Architecture:** ARM Cortex-M0,dual-core 32-bit
- **CPU Cores:** 2
- **RAM:** 264KB
- **Flash:** 2MB
- **USB:** USB Type-C 2.0
- **Power:** 5V via USB Type-C
- **Operating Voltage:** 3.3V
- **Dimensions:** 33.25 × 15.5mm
- **SD Card:** No

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Compatible Firmware

Klipper

## Use Cases

- 3d-printer
- input-shaping
- resonance-testing
- klipper

## Components

- **ADXL345** (sensor): 3-axis digital accelerometer with up to ±16g range and 4-wire SPI interface, used for resonance measurement — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.analog.com%2Fmedia%2Fen%2Ftechnical-documentation%2Fdata-sheets%2FADXL345.pdf&ref=openhardware.directory&product=bigtreetech-adxl345-v2-0-accelerometer-board&source=md-export)

## Protocols

- **SPI**
- **USB 2.0**

## Description

The BigTreeTech ADXL345 V2.0 is a compact accelerometer module designed specifically for Klipper's input shaping (resonance compensation) feature. Mounting it on a printer's toolhead or bed allows Klipper to measure resonance frequencies and automatically calculate optimal input shaping parameters to reduce ringing artifacts in prints.

At its core is a Raspberry Pi RP2040 dual-core microcontroller running at 133MHz, which handles USB communication and interfaces with the ADXL345 accelerometer over 4-wire SPI. The board connects to the host computer or SBC via USB Type-C, with an ESD protection chip on the USB port to prevent damage from static discharge.

The tiny 33.25 × 15.5mm form factor makes it easy to attach to almost any 3D printer toolhead or bed carriage. The board includes a reserved BOOT button for firmware updates and customizable solder points for flexible wiring. It is compatible with BTT Pi V1.2, Manta M8P, and standard Raspberry Pi boards running Klipper.

## Where to Buy

- [BIQU Equipment](https://openhardware.directory/r?to=https%3A%2F%2Fbiqu.equipment%2Fproducts%2Fadxl-345-accelerometer-board-for-36-stepper-motors&ref=openhardware.directory&product=bigtreetech-adxl345-v2-0-accelerometer-board&source=md-export) — $9.99

## Resources

- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fbigtreetech%2FADXL345&ref=openhardware.directory&product=bigtreetech-adxl345-v2-0-accelerometer-board&source=md-export)
- [product](https://openhardware.directory/r?to=https%3A%2F%2Fbiqu.equipment%2Fproducts%2Fadxl-345-accelerometer-board-for-36-stepper-motors&ref=openhardware.directory&product=bigtreetech-adxl345-v2-0-accelerometer-board&source=md-export)

## Tags

`adxl345`, `accelerometer`, `klipper`, `input-shaping`, `rp2040`, `3d-printer`, `bigtreetech`, `open-source`, `resonance-compensation`

## Images

![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/5f5579f11093.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/a5fbd82a4927.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/d93d67c1437d.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/cdb276956fcc.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/bdcb62dfedfb.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/bf214daaf990.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/2ddccf12ff15.jpg)
![BigTreeTech ADXL345 V2.0 Accelerometer Board](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-adxl345-v2-0-accelerometer-board/92798824cd45.jpg)

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