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Unread 12-03-2017, 09:16 PM
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vanjan14 vanjan14 is offline
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Does anyone recognize this hardware?

In our clean out of some old hardware we found two of these boards in a drawer full of IFI control system components. The only marking on the board is "JEM" on the bottom. There as a PWM cable soldered to the board.
Does anyone recognize them and can tell use what they are for? We have tried searching but have come up with nothing.

https://imgur.com/a/SU9wc

Thanks!
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Unread 12-03-2017, 09:26 PM
sanddrag sanddrag is offline
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Re: Does anyone recognize this hardware?

In my 17 years in FIRST Robotics I can say I've never come across that particular board. Perhaps something another student or mentor brought in to your team during a prior year.
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Unread 12-03-2017, 09:38 PM
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Re: Does anyone recognize this hardware?

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Originally Posted by sanddrag View Post
In my 17 years in FIRST Robotics I can say I've never come across that particular board. Perhaps something another student or mentor brought in to your team during a prior year.
Agreed. This wasn't something in the kit or widely seen as a COTS item.
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Unread 12-03-2017, 09:41 PM
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Re: Does anyone recognize this hardware?

I didn't see anything here that looked like that board: http://www.team358.org/files/programming/ (which was a fun read).
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Unread 12-04-2017, 12:41 AM
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Re: Does anyone recognize this hardware?

A lesson to future board designers... etch or print a part number and the company name onto the board. It costs you nothing, but might save someone a bit of hassle a decade down the road.

Jason
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Unread 12-04-2017, 01:11 AM
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Re: Does anyone recognize this hardware?

you noticed the date code on the processor is over 20 years old, didn't you?
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Unread 12-04-2017, 08:57 AM
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Re: Does anyone recognize this hardware?

If you look at this link it will tell you what the micro-controller does. I looked up the part number and found this:

http://pdf1.alldatasheet.com/datashe...HC705C8FN.html
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Unread 12-04-2017, 08:59 AM
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Re: Does anyone recognize this hardware?

What you've got there is a controller board for a Rockwell Automation Retro Encabulator.

Here a good technical overview: https://youtu.be/RXJKdh1KZ0w
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Unread 12-04-2017, 09:58 AM
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Re: Does anyone recognize this hardware?

The geek version of being "Rick Rolled"?
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Unread 12-04-2017, 10:37 AM
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Re: Does anyone recognize this hardware?

Quote:
Originally Posted by Kevin Thorp View Post
What you've got there is a controller board for a Rockwell Automation Retro Encabulator.

Here a good technical overview: https://youtu.be/RXJKdh1KZ0w
Gotta be careful of that Dingle Arm tho.
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Unread 12-04-2017, 12:39 PM
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Re: Does anyone recognize this hardware?

After looking at the picture(s) for awhile I'm going to hazard that it's a driver board for stepper motors.

It looks like there are 6 sets of driver circuits (gate drivers) feeding into 12 power transistors, creating H-Bridges. The power and ground feed from each end of the terminal strip row.

The switches across the top are controlling if the bridges are to do a momentary pulse (so the stator can attract the rotor poles) or if it should toggle between N/S to pull/push the rotor.

The 6805 CPU in the center has enough grunt to manage the timings.

Dig in you teams past history and see if one of the designs had a stepper motor as part of it, you might find more hints there.

Variable reluctance stepping motors have three to five pairs of windings, creating several phases on the stator. It allows the motor to turn, but also have full torque in a stopped position. So this is some spiffy hardware. (If I'm right)
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Unread 12-04-2017, 01:33 PM
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Re: Does anyone recognize this hardware?

Quote:
Originally Posted by Foster View Post
Dig in you teams past history and see if one of the designs had a stepper motor as part of it, you might find more hints there.
Were steppers ever legal in FRC? I don't doubt that this is a stepper board, but I think it may more likely be from an old CNC machine or similar device.
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