My homing routine was still full of bugs. I tried to write a method that would count the number of encoder segments in a complete revolution, but I kept getting two wildly different numbers. There shouldn’t have been any trouble sensing the magnet on the pillar’s base.
I knew there should be roughly 100 segments, but the numbers 17 and 81 kept coming up, one after the other. When I watched the pillar spin, it seemed like the homing routine was acknowledging the point where the magnet first came into sensor range AND when it left sensor range. It should only have been recognizing one or the other.
The problem was not that my magnet was weak, the problem was that the strong magnet was producing a field that triggered the reed switch twice. I swapped out the beefy magnets for a stack of them which were smaller in diameter. The resulting field was more contained, but I had to trim the foam brushes, or they would sweep away the puny magnets.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
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2019-09-16
Large, easy-to-attach magnet
I knew there should be roughly 100 segments, but the numbers 17 and 81 kept coming up, one after the other. When I watched the pillar spin, it seemed like the homing routine was acknowledging the point where the magnet first came into sensor range AND when it left sensor range. It should only have been recognizing one or the other.
Screenshot of problematic homing routine
The problem was not that my magnet was weak, the problem was that the strong magnet was producing a field that triggered the reed switch twice. I swapped out the beefy magnets for a stack of them which were smaller in diameter. The resulting field was more contained, but I had to trim the foam brushes, or they would sweep away the puny magnets.
Small, precise magnets and trimmed foam brushes
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information in this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2019-09-16
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