adxl345-probe

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# ADXL345 Probe
[![](https://dcbadge.vercel.app/api/server/APw7rgPGPf)](https://delta2.eu/discord)
[![CC BY-NC-SA 4.0][cc-by-nc-sa-shield]][cc-by-nc-sa]

**!!! This project is in a BETA state, use at your own risk !!!**

The ADXL345 has an interesting feature called tap detection. With the appropriate tuning, this can be used to implement a nozzle probe on 3D printers.
This project aims to support nozzle probing through tap detection for printers using Klipper.

You can watch this thing in action here:
[https://www.youtube.com/shorts/_qd0kMkrVZw](https://www.youtube.com/shorts/_qd0kMkrVZw)

Results you can expect for a properly tuned system (This was on a Voron Trident):

```
probe accuracy results: maximum 0.007500, minimum 0.000937, range 0.006563, average 0.004031, median 0.004219, standard deviation 0.001841
```

I also measured the force on the bed using a standard kitchen scale, this was approximately 200g. A CAN bus board was used, so a direct connection might result in a quicker stop (See Multi MCU homing in the Klipper docs for more information on this).

## Installation

```bash
cd $HOME
git clone https://github.com/jniebuhr/adxl345-probe
cd adxl345-probe
./scripts/install.sh
```

## Physical setup

This code requires the ADXL int1 or int2 pins to be wired to one of your boards (preferrably the one that controls Z motion).
For a ADXL345 breakout board, simply run a wire. If you're using a CAN toolboard, the following boards are supported as they have wired the pins:

## Supported Boards

| Board  | Supported | int_pin | probe_pin | Link |
| ------ | :-------: | ------- | --------- | ---- |
| Mellow Fly SB2040 (v1/v2) | ✓ | int1 | gpio21 | https://aliexpress.com/item/1005004675264551.html |
| Mellow Fly SHT36 v2 | ✓ | int1 | PA10 | https://aliexpress.com/item/1005004675264551.html |
| Huvud | ✓ | ? | ? | |
| NiteHawk | ✓ | int1 | gpio21 |
| EBB36 | with soldering | int1/int2 | choose | |

## Configuration

This configuration must be **below** your adxl345 section.

```
[adxl345_probe]
probe_pin: <pin for either int1 or int2>
int_pin: int1 # select either int1 or int2, depending on your choice of wiring
tap_thresh: 12000 # this needs to be tuned
tap_dur: 0.01 # this needs to be tuned
speed: 20 # this needs to be tuned
z_offset: 0
# Adjust this to your liking
samples: 3
sample_retract_dist: 3.0
samples_result: median
samples_tolerance: 0.01
samples_tolerance_retries: 20
```

If you want to use the probe as Z endstop as well:

```
[stepper_z]
... your remaining config ...
endstop_pin: probe:z_virtual_endstop
```

Make sure to remove `position_endstop` in this case.

## Tuning guide

In progress...

## License

This work is licensed under a
[Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].

[![CC BY-NC-SA 4.0][cc-by-nc-sa-image]][cc-by-nc-sa]

[cc-by-nc-sa]: http://creativecommons.org/licenses/by-nc-sa/4.0/
[cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png
[cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg?style=for-the-badge

adxl345-probe

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