Nearly every time I played a note, the unit would reset. In my Arduino code, I had a serial message that would transmit upon startup, and it appeared during these lulls, so I was sure it was resetting, not just hanging in code. I could feel a surge from the power supply when an electromagnet energized, but that power was not directly interfacing with the control power. I thought it could still be generating unwanted interference, and I wanted to protect the power supply, so I added flyback diodes (Wikipedia link) to each solenoid. These were diodes I happened to have in stock.
The diodes prevented the nuisance resetting, but I still need to modify the code so I can play notes simultaneously. Button presses introduced a delay each time, and that prevented a second press from registering.
The hot glue holding the picture hangers to the plastic keys was coming loose. I remelted the glue on one key, and it stuck, but another came loose, so this is not a long-term solution. Screws or bolts will likely swap out the cement, which may require counter-weights inside the keys.
Flyback diodes across solenoids
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 email@example.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.