Prusa Connect with Raspberry Pi and Bluetooth LE trigger for timelapse  

RE:

Please tell us more how you connected the Rpi Zero W to the printer.

I have few ideas, in general you can use just rpi to listen to gpio pin trigger (and a script to send command via BLE to the cam).
You can also add Feather to the mix if needed to listen to gpio pin trigger.

And you can power both devices from the printer.

RE: Prusa Connect with Raspberry Pi and Bluetooth LE trigger for timelapse

Hey, 

I have that pi connected currently in the pi slot on the back of the Einsy board as per the setup instructions for running prusa link 

RE: Prusa Connect with Raspberry Pi and Bluetooth LE trigger for timelapse

hm, looking at https://blog.prusa3d.com/how-to-make-3d-print-time-lapses-with-your-smartphone-camera_29790/ , especially
and https://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744 especially
and comparing it to https://pinout.xyz/ ...

It looks like the trigger pin from einsy is exacklty in the place where ground pin is on Rapsberry Pi - not great, because you would have to rewire it to other pin (if you like soldering) or somehow do a reroute with some pogo pins not to touch ground on rpi.
So it would be better to choose different pin, if einsy allows it and has spare pin that could be useable and not colliding with gpio pins on rpi. So this needs further search which pins are availabe to use.

Next - triggering would be better done not to generate 5V level (M42 S255 P73 where S255 is max value) but maybe something lower (so probably S168 but would need to check with the multimeter if it actually generates that voltage).

Additionally not sure what's going on on the prusalink rpi image, but double check it has bluetooth enabled (if not then notice that enabling ti may break all the thigns https://github.com/raspberrypi/documentation/blob/develop/documentation/asciidoc/computers/configuration/uart.adoc#uarts-and-device-tree )

So in best scenario you should be able to use rpi with triggering via gcode specific einsy pin, which would be detecded by code on rpi, which would then execute command to send message via bluetooth.

In worst scenario attach Feather to power pins on rpi gpio and re-route default pin from einsy to Feather and use Feather for detection of the gpio pin change and sending message via bluetooth. This leaves rpi intact - and doing what it woudl be doing - running PrusaLink.

RE: Prusa Connect with Raspberry Pi and Bluetooth LE trigger for timelapse

Thanks for your thorough reply.