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Post by wannabeaflyer on Sept 14, 2017 19:59:43 GMT
Hi Guys I have a6DOF motion simulator using my DIY linear actuators , was reading through some updates on the Motionsimblogspot website and came across this
" The linear servomotors on the photo below come with a 12-bit DAC that captures the encoder pulses and converts them to analog 0-5v output to easy interface them on the AMC1280USB as you would do to a potentiometer solution sensor. It involves a little automation for the encoders calibration, with a contactless limit switch for home position during power up, but after that its completely relying on the internal encoders for the position control."
I would really like to replace my Multi turn wire wound pots with 600PP/R optical encoders and saw the mention of a 12 Bit DAC 0-5V output mentioned in the same section ..
is there any info as to the make of the DAC ( looks like Arduino Nano in the picture) shown . are there any examples of this being used for servo motors (mine is ballscrew assembly driven by DC Motor with currently Multiturn Pot for position feedbac..
this works great with my AMC with the Pot signal going to the AMC Digital Expansion Card . but not sure how I would change these for optical encoders and DAC which would feed into the same digital Card .. or how I would go about initialising the homing process ..
any help or pointing me in the right direction with a link would be great . thanks Guys
1.bp.blogspot.com/-X6YWaSfW4LM/WTcCzCB7GQI/AAAAAAAAnjU/NpxPK1MJ8ckwZzRGSsClcfJiAE4x2ig1QCK4B/s400/AMC1280USB%2BServomotor%2Blayout.png
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Post by tronicgr on Sept 16, 2017 12:26:00 GMT
The system uses 32bit STM32 microcontroller clocked to 72Mhz to be able to capture the pulses.
I'm implementing a similar solution these days that can also connect digitally on the AMC1280USB via the new SSI inputs connectors.
This will make easier the interfacing to actual encoders that servomotors already have mounted on them. I'll be making announcement about it soon.
Thanks Thanos
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Post by wannabeaflyer on Sept 16, 2017 14:57:36 GMT
Hi Thanos this would be a great upgrade and allow even more interfacing possibilities . will be watching this like a hawk because thanks to your great controller and my DIY linear actuator there is interest in doing this by the common DIY wannabees out there ..
Im currently re-assembling my 6DOF motion platform and this would be the icing on the cake ..I will have both options one controller using the BFF software and and One with the new Kickstarter Basic card for Simtools Maybe..
I was/Am very happy with my current AMC128USB setup running with BFF but the 10Turn 10k Pots seem to ne the weak link and would love to use optical encoders even if I have to use a homing routine 1st before running any simulation ( I did that with my dimension engineering Kangaroo setup and it was not an issue ..
would the homing function be built into the AMC firmware?
Just wanted to say thanks for getting back to me with this great news , I know your very busy with the kick starter project so will wait my turn LOL :-) YOUR A STAR SIR
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