ADXL345 Support

[Dalarialus]

Is there anything that would prevent this hat being used in conjunction with a ADXL345 accelerometer? From what I can see, it doesn't look like there are any obvious pin conflicts with the documentation on klipper, but I'm still painfully new at this!

[rclsilver]

Hello.

If the needed pin are free (cf the readme) then it is OK.

We can create some pads on the board to make easier to connect your component. AFAIK the ADXL345 needs an i2c channel to work?

[Dalarialus]

As far as I can tell, the ADXL345s can use an SPI channel - If I wanted to use a pair of them (one for the hotend, one for the bed), I think I should be able to connect them both to SPI5?

Signal	Hotend Sensor	Bed Sensor
SCLK	GPIO 18 (Pin 12)	GPIO 18 (Pin 12)
MOSI	GPIO 19 (Pin 35)	GPIO 19 (Pin 35)
MISO	GPIO 20 (Pin 38)	GPIO 20 (Pin 38)
CE	GPIO 21 (SPI5.0 - Pin 40)	GPIO 17 (SPI5.1 - Pin 11)
VCC	3v3 (Pin 1 or 17)	3v3 (Pin 1 or 17)
GND	Ground (Any Suitable Pin)	Ground (Any Suitable Pin)

And then use dtoverlay=spi5-2cs in /boot/config.txt.

I don't think that conflicts with any of the pins your hat is already using, and Klipper should be able to address both sensors as long as they have their own CE pins.

Assuming that I haven't gotten this completely wrong, it should be possible to break those pins out to a couple of headers on the hat, right?

[rclsilver]

Yes, we could add two headers for this usage but IMO, you should check that everything is OK with Klipper, I never used it