REGISTER | LOGIN
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 2 / 2
antedeluvian
User Rank
Author
Re: No MCU needed
antedeluvian   2/5/2014 9:14:54 AM
NO RATINGS
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
User Rank
Author
Re: No MCU needed
MeasurementBlues   2/4/2014 10:50:41 PM
NO RATINGS
antedeluvian, here's the video I promised below.

 

 


MeasurementBlues
User Rank
Author
Re: No MCU needed
MeasurementBlues   2/4/2014 7:59:57 PM
NO RATINGS
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
User Rank
Author
Re: No MCU needed
antedeluvian   2/4/2014 6:29:53 PM
NO RATINGS
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
User Rank
Author
No MCU needed
MeasurementBlues   2/4/2014 6:03:25 PM
NO RATINGS
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
User Rank
Author
Test fixtures
MeasurementBlues   2/4/2014 5:59:41 PM
NO RATINGS
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.

<<   <   Page 2 / 2


Most Recent Comments
Tim R Johnson
 
ewertz
 
antedeluvian
 
ewertz
 
perl_geek
 
R_Colin_Johnson
 
perl_geek
 
R_Colin_Johnson
 
dt_hayden
Like Us on Facebook
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Martin Rowe

Test Tool Finds Ethernet Wiring Errors
Martin Rowe
Post a comment
When my house was renovated several years ago, I had the electrician install network outlets in numerous places, then run the LAN cables to a wiring closet. But he didn't document the ends ...

Martin Rowe

Local Electronics Store Supplies Engineers and Hobbyists
Martin Rowe
5 comments
Rochester, N.Y. — Tucked away in this western New York city known for its optics is Goldcrest Electronics, a local store that's supplied businesses and individuals with electronic ...

Martin Rowe

How to Transform a Technology University (Book Review)
Martin Rowe
1 Comment
The Presiding Genius of the Place by Alison Chisolm. WPI, Worcester, Mass., 234 pp., 2016. Engineers love to discuss, and often criticize, engineering education. They often claim ...

Max Maxfield

Aloha from EEWeb
Max Maxfield
Post a comment
Just a few minutes ago as I pen these words, I posted this blog about this month's Cartoon Punchline Competition over on EEWeb.com.