Now that MIDI could be reliably received by connecting directly to the receiving pin, it was necessary to replace the optocoupler board. This was installed with screw terminals which was good news for a couple of reasons. It would be easy to take out, a replacement could be built while the old one was in place, and the defunct board could be upgraded with better optocouplers and swapped back.
The new boards had all the old connections for two MIDI inputs, Vcc, 0V, and output. Not all the pins were necessary, but it wouldn't hurt to connect them. The incoming signal was wired directly to the outgoing terminals, and a pull-up resistor was added for good measure.
Swapping the board took a couple of minutes. This time, a layer of electrical tape was added to the bottom of the board to prevent electrical shorts. For some reason, I missed this on the last board.
After reassembly, everything was tested, and the data looked correct and reliable. All eight notes on the drum machine were tested, and each time, they came through on channel 10 with a different note designation. The last column was velocity, but the notes were playing live, so they were not consistent.
The rest of the posts for this project have been arranged by date.
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.
2019-04-27
Top view
The new boards had all the old connections for two MIDI inputs, Vcc, 0V, and output. Not all the pins were necessary, but it wouldn't hurt to connect them. The incoming signal was wired directly to the outgoing terminals, and a pull-up resistor was added for good measure.
Bottom view
Swapping the board took a couple of minutes. This time, a layer of electrical tape was added to the bottom of the board to prevent electrical shorts. For some reason, I missed this on the last board.
New MIDI IN module
After reassembly, everything was tested, and the data looked correct and reliable. All eight notes on the drum machine were tested, and each time, they came through on channel 10 with a different note designation. The last column was velocity, but the notes were playing live, so they were not consistent.
Receiving reliable data
The rest of the posts for this project have been arranged by date.
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.
2019-04-27
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