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The Art of Test, Part 1: Boards, Subassemblies, & Products

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antedeluvian
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Re: No MCU needed
antedeluvian   2/5/2014 9:14:54 AM
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Martin

Great video. I must admit it is the first time I have seen video comment. I normally struggle to insert even a jpg file.

MeasurementBlues
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Re: No MCU needed
MeasurementBlues   2/4/2014 10:50:41 PM
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antedeluvian, here's the video I promised below.

 

 


MeasurementBlues
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Re: No MCU needed
MeasurementBlues   2/4/2014 7:59:57 PM
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antedeluvian, Yes it was a simple stat machine, a 4-bit counter driving a ROM. I think it maybe 5-6 counts after eacy cycle, a sensor wouldclear the counter and the repeasted. Simple but effective. The mechanica techs in the lab though it was cool waht we electrical guys did.

I have a story about the tech, but it needs a video. Maybe in the next few days. Tomorrow I'll be shoveling snow in between comments.

antedeluvian
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Re: No MCU needed
antedeluvian   2/4/2014 6:29:53 PM
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Martin

I also designed some fixtures that used a simple ROM. We had the mechancial arm that ran on a motor, back and forth. The arm would reach then end and a sensor would detect it and clock a counter that would send the ROM to the next step, reversing the motor. At the other end the same thing occurred and the arm just went back and forth. The ROM would power up into a state that sent the motor to a known positon and the counter would wait for a pulse from the position sensor.


This sounda like it would have been an ideal application for Mororola's MC14500 single bit (4 bit instructiion set) micro. It also needed external counters and an EPROM. But it could have done your decision making.

Your arrangement sounds rather like a state manchine implemented with a ROM intead of the PLD. At one point the generic development tools like CUPL actually supported PLDS implemented with (E)(P)ROMs. I know I designed one product like that.

MeasurementBlues
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No MCU needed
MeasurementBlues   2/4/2014 6:03:25 PM
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I also designed some fixtures that used a simple ROM. We had the mechancial arm that ran on a motor, back and forth. The arm would reach then end and a sensor would detect it and clock a counter that would send the ROM to the next step, reversing the motor. At the other end the same thing occurred and the arm just went back and forth. The ROM would power up into a state that sent the motor to a known positon and the counter would wait for a pulse from the position sensor.

MeasurementBlues
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Test fixtures
MeasurementBlues   2/4/2014 5:59:41 PM
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The closest I came to designing uC based fixtures was with an 8085. We used it to exercise stepper motors. The program would rampt the motor up and down in speed to emulate how the motor would be used in real life.

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