Power Pi4B via Einsy? - Improvements (Archive)

RE: Power Pi4B via Einsy?

karl-herbert — Sat, 18 Jul 2020 16:43:18 +0000

@protoncek

That's right. To flash the FW you need to reset.
My printer is fixed in an enclosure and the USB port is placed outside the enclosure. There I have connected my Linux laptop, with which I do all the work on the printer (fw compiling, flashing...) and Raspi. GPIO connection speed with Octoprint is 250k baud and stable.

RE: Power Pi4B via Einsy?

cwbullet — Sat, 18 Jul 2020 15:29:55 +0000

The reason I use the cable is I can turn it on and off with one switch.

RE: Power Pi4B via Einsy?

Protoncek — Sat, 18 Jul 2020 14:54:18 +0000

I did have connected with such cable but went back to USB. Reason? I update printer's FW via Octoprint plugin FW updater and this plugin can't reset einsy via this cable, thus FW update is not possible. USB connection does that.

In any case i don't see much difference in connection - at the end same two RX an TX pins are used on MEGS2560...

RE: Power Pi4B via Einsy?

cwbullet — Sat, 18 Jul 2020 14:00:26 +0000

@karl-herbert

True. It is not worth my time and that cable is very professionally done with a great protective sleeve.

RE: Power Pi4B via Einsy?

karl-herbert — Sat, 18 Jul 2020 13:40:41 +0000

@charles-h13

Of course you can also buy this finished product, but you can also easily build it yourself. In the beginning I used a self assembled ribbon cable as an alternative.

something like this one: https://www.amazon.de/14-polig-2-54mm-Steigung-Buchse-Flachband/dp/B012SPRYMG

what I would not recommend due to lack of stability are these jumper wires: https://www.amazon.de/Aukru-20cm-female-female-Steckbr%C3%BCcken-Drahtbr%C3%BCcken/dp/B00OL6JZ3C

I only use them on the plug-in board for experimental purposes.

RE: Power Pi4B via Einsy?

cwbullet — Sat, 18 Jul 2020 12:34:51 +0000

These cables make it easy!

RE: Power Pi4B via Einsy?

karl-herbert — Tue, 16 Jun 2020 19:32:29 +0000

I have attached a electrical distribution panel to the enclosure, from which I take the voltage for the printer, the raspberry, lights, ventilation and others from. The distribution panel and the individual components are specially secured with different fuses = only one 230V power cable to the printer(enclosure).

RE: Power Pi4B via Einsy?

karl-herbert — Tue, 16 Jun 2020 19:15:23 +0000

@nikolai-r

i agree 1000% 👍

RE: Power Pi4B via Einsy?

Nikolai — Mon, 15 Jun 2020 19:37:54 +0000

Posted by: @livinlarge0786
Before anyone asks, the reason I'm pursuing this is that the idea of 2 separate power cables to 1 device (the printer, overall) is fundamentally wrong/unrefined in my mind.

For me the printer and RPI are two different and separate devices. The one is always on (to get the updates and control the printer) and the other one is executing the tasks/prints.

Your setup is pushing the hardware out of specs. The einsy voltage regulator (LM25011MY) data sheet is saying:

Current - Output	2A

This is for everything connected to 5V. Means your setup might work under certain conditions but you shorten the live span of the components and risk instability/hardware failure. I wouldn't recommend it.

RE: Power Pi4B via Einsy?

Protoncek — Mon, 15 Jun 2020 09:57:43 +0000

Sorry, i messed up two commands.. correct is this:

power of button:

dtoverlay=gpio-shutdown,gpio_pin=7
This will cause GPIO7 (pin 26) going LOW to do a shutdown;

relay pin:

dtoverlay=gpio-poweroff,gpiopin=27,active_low=1
GPIO27 (pin13) will indicate the pi is running when: HIGH if active_low=1; LOW if active_low=0