#Octopus 1.1 power jumper

19 messages · Page 1 of 1 (latest)

cosmic veldt
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I'm probably being very paranoid here, but I'm building the LDO 2.4r2 Rev C kit (comes with an Octopus 1.1 mainboard) and while following their guide they show a jumper for 5V coming from USB-C (https://raw.githubusercontent.com/MotorDynamicsLab/LDOVoron2/main/Images/WiringGuide/RevC/Octopus_Jumpers.jpg) and this jumper is also shown as set in the final image for checking your work. I'm confused by this. My understanding is that by setting this jumper, powering the MCU is done from USB-C's 5v bus instead of power_in. However, the RPi is powered via a 5V board using the Octopus's 5v output. What has me confused is, is the 5v out from the octo populated by the 24v power_in?

hollow slate
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youd only need it to power it via usb, for say, flashing initially. compare it to the voron initial startup guide for installing software on the octopus

cosmic veldt
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Right, but my point goes to the part where the RPi is getting it's power from the Octopus...so how is it powering the power source

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or is the 5v out on the octo just a regulated out from the power_in

hollow slate
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probably a buck converter from 24v to the adapter LDO uses to then connect to the pi. its been a while but thats what i recall. the thing in the upper right of your photo

frosty oriole
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if your 24V power is active for the entire process, then you shouldn't ever need that jumper.

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that jumper is only needed if you're powering the pi from some other source, and in turn using the pi to boot the octopus enough to flash

hollow slate
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its primarily for flashing via usb which it would need pwer for, dfu mode, etc

frosty oriole
hollow slate
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you are lime. ill let you choose

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probably with the mic.

cosmic veldt
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OK, so if my plan is that I will hook up to mains, and boot and not separately power the pi to compile and DFU then I'm good to remove the jumper

frosty oriole
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yep, I'd say so

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in which case, I would also say take note of the various warnings about disconnecting the heaters, just in case

cosmic veldt
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as in, disconnect the heaters until the firmware is loaded

hollow slate
frosty oriole
hollow slate
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i have ldo 2.4 kit as well, lots of stuff in that repo