7C80

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02 Feb 2019 01:32 - 02 Feb 2019 02:52 #125514 by blazini36
7C80 was created by blazini36
No idea when this thing came into existence but i need a couple of these guys. I don't even care if they're prototypes.



Any info? PCW?
Last edit: 02 Feb 2019 02:52 by blazini36.

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02 Feb 2019 14:38 #125539 by pl7i92
Replied by pl7i92 on topic 7C80
You may ask him Direct Live on the IRC chatroom
USE hexchat
connect to freenode
and /join #linuxcnc

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11 Feb 2020 22:42 #157105 by alkabal
Replied by alkabal on topic 7C80
Hi

I'm thinking about ordering RPI4 + Mesa 7c80 for retrofit a mini mill

Did you know if this is possible to output PWM for control spindle with DAC using regular output or step output ?

i know this board include a digital dedicated circuit but i like to know if i can use other output.

Br

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11 Feb 2020 23:13 #157108 by PCW
Replied by PCW on topic 7C80
The 7C80 has a built-in isolated analog spindle control circuit
so no external interface hardware is needed, but if you require
a PWM output, a step/dir output or expansion connector
output could be used with the right firmware. In addition
if you dont need very fast response, you can use one of
the isolated outputs as a slow PWM source
(PWM limited to servo thread update rate )

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12 Feb 2020 02:55 #157110 by alkabal
Replied by alkabal on topic 7C80
For right firmware, i need to customize myself ? (source code available ?)

I ask this because i have also a mini lathe with machinekit and for this one i haven't enough free wire for dedicated spindle circuit like this board (really something like impossible to add new wire in a cleaner way for this lathe spindle)

But this is really a great include !!! i plan to use this built-in control for mini mill

The question is mostly because i think about sharing control panel for both machine (hobby use)

Thanks a lot for reply

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12 Feb 2020 16:46 - 12 Feb 2020 16:47 #157192 by PCW
Replied by PCW on topic 7C80
For a spindle its usually better to use an isolated interface circuit and they tend to generat a lot of EMI. As I mentioned, you can use one of the 7C80s isolated outputs and a RC filter
to generate and variable analog voltage

I also will be adding some 7C80 firmware options to support common parallel port BOBs
(like the ubiquitous "5 AXIS MACH" BOB) The "5 AXIS MACH" BOB has a analog spindle output
Last edit: 12 Feb 2020 16:47 by PCW.

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12 Feb 2020 19:46 #157210 by alkabal
Replied by alkabal on topic 7C80
Yes you are right i have a fully isolated DAC circuit in the spindle enclosure.

I only need a "good" PWM output so if i understand : the best is use step or dir output for unisolated spindle PWM.

Thanks, BR

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15 Feb 2020 01:16 - 15 Feb 2020 01:17 #157394 by PCW
Replied by PCW on topic 7C80
I have added a support zip file for the 7C80 with 4 new bitfiles

7c80_5abobd.bit 7C80 + Ebay special "5 Axis BOB"

7c801p_5abobd.bit + Ebay special "5 Axis BOB" Stepgen 5 on 7C80 step pin replaced with PWM

7c80_7i85d.bit 7C80 + 7I85

7c80_7i89d.bit 7C80 + 7I89
Last edit: 15 Feb 2020 01:17 by PCW.

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15 Feb 2020 21:11 #157488 by alkabal
Replied by alkabal on topic 7C80
Hi

I'm sorry but i'm new with mesa board so i need confirmation.

7c801p_5abobd.bit this one allow to use the onboard step/dir output 5 for allow to use PWM out from this pin.
This firmware is compatible with 5 axis mach bob but as an option and can be used without this bob if the additional pin is not used by config ?

Thanks for your work :

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15 Feb 2020 21:24 #157489 by PCW
Replied by PCW on topic 7C80
Yes, 7c801p_5abobd.bit replaces STEP5 with PWM1 (DIR5 is just GPIO)
The BOB is not required.

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