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Hardware & Machines
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Driver Boards
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Low Cost Raspberry Pi Contoller Board
Low Cost Raspberry Pi Contoller Board
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Posts: 19188
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Thank you received: 6433
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09 Apr 2024 11:01 #297850
by tommylight
Did anyone notice the RPI4/8gb is more expensive than RPI5/8gb ?
Still, at 90E it is to much.
BTW, sometimes, i get nice deals on that website, being a good customer n stuff, they are the only ones that actually work here, they deliver to my door and they never failed to deliver whatever i ordered there, even when the price listed was wrong , example got 2 of Creality CR-5 PRO for 656 Euro total when the price was $1300 in china, for one!
So i can justify a bit higher prices for sure, but not for RPI.
End rant.
So what are the prices for ethernet variants?
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09 Apr 2024 11:46 #297859
by cornholio
Yeah I did and put forward a reason why. The 5 kinda broke a bit the RPi ecosystem for using the gpios, a lot of mature code won’t work on the 5.
Computation wise it is a beast for a SBC.
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09 Apr 2024 20:18 #297871
by meister
How Many Axis do you need
little fun-project, almost without soldering, but works and is inexpensive
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10 Apr 2024 00:20 #297880
by Project_Hopeless
How Many Axis do you need
little fun-project, almost without soldering, but works and is inexpensive
For this project 5 step/dir channels and some way to control a 3-wire RC servo motor. I'd go with a 6 channel Mesa card if it wasn't a little pricey and out of stock.
I've seen that setup you mention, or something similar in the LinuxCNC compatible board list. Soldering doesn't scare me, code does, I'm a novice/intermediate coder. What I liked about the Mesa board I have on my router, it was virtually plug and play.
If I can save a few dollars and learn something along the way, maybe I'll give this route a go. I'll have to check into it.
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10 Apr 2024 01:12 #297883
by PCW
A 7I92TH/TF and a couple Mach 5 Axis BOBs could do this
(or even without the BOBs if you are careful...)
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10 Apr 2024 23:12 #297971
by Project_Hopeless
A 7I92TH/TF and a couple Mach 5 Axis BOBs could do this
(or even without the BOBs if you are careful...)
Crazy idea, what is the frequency of the spindle PWM signal on a 7i96 card? Can I co-op that to drive a RC servo. Or use a spare output and pulse at 50 Hz? Can the I/O handle that kind of duty cycle toggling?
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Thank you received: 4739
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10 Apr 2024 23:43 #297974
by PCW
Mesa firmware includes a specific PWMgen for RC servos: RCPWMGen.
This can be added to any Mesa FPGA card. Standard PWMgens tend
to have low resolution when used for RC servos as the full scale
duty cycle of RC servos is quite low ( a few %)
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11 Apr 2024 00:50 #297975
by Project_Hopeless
Mesa firmware includes a specific PWMgen for RC servos: RCPWMGen.
This can be added to any Mesa FPGA card. Standard PWMgens tend
to have low resolution when used for RC servos as the full scale
duty cycle of RC servos is quite low ( a few %)
In my case even low res motion is better than stop to stop action. Out of curiosity what physical pins on a 7i96 would drive the RC servo.
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11 Apr 2024 01:01 #297976
by PCW
7I96S firmware with P1 pinout for the common "Mach 5 Axis BOB"
2 additional step/dir channels (7 total) and 4 RCPWMgens on the BOB
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12 Apr 2024 00:25 #298037
by Project_Hopeless
7I96S firmware with P1 pinout for the common "Mach 5 Axis BOB"
2 additional step/dir channels (7 total) and 4 RCPWMgens on the BOB
Would any inexpensive aka chinese "BOB" work?
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Hardware & Machines
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Driver Boards
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Low Cost Raspberry Pi Contoller Board
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