NE555 eight-note electronic keyboard_V1.0

1. Description of the work

• An eight-tone electronic keyboard ruler designed based on NE555, open source protocol CC-BY-NC-SA 3.0. For secondary development, please sign the original author, point to the link to this project, and indicate whether to modify it, and open source it under the same license. Commercial use is prohibited.
• When not welding, it is a ruler, which can roughly measure the length within 9cm.
• After welding, it is an eight-note electronic keyboard, which can produce eight tones through the buttons, but the intonation is not very accurate.
• The power supply interface can be welded with microUSB socket, P2.54 pin header, P2.54 female header, P2.54 plug terminal, etc., and uses 5V DC power supply.
• The output interface can be welded with P2.54 pin headers, P2.54 plug terminals, etc., and external speakers can be connected.
• Regardless of whether it is welded or not, it can be used as a small gift for others. Everyone is welcome to like and comment.

2. Actual pictures of the works

From top to bottom are the PCB front, PCB back and welding finished product pictures (don’t ask me why I welded tantalum capacitors, do you believe me when I say the electrolytic capacitors are just used up)

3. Other documents

By the way, it comes with some commonly used 8-tone song scores. Friends who are interested can make them for themselves (although it feels a bit silly, but happiness is so simple)

4. Demonstration video