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Hello people,
So I’ve been thinking about this project for quit some time and consulted some friends, but there’s still a lot of question that remain.
I will list them down here, and if you can help with any of these please answer. You should know that I’m new to electronics (tried some Arduino at school, but this is my first actual project)
Well the idea is to make an electronic music box that reads mp3 files of an sd card and with that a turning figurine (like in those old mechanical music boxes with ballerinas).
The questions that remain:
1) Is it possible to use a stepper motor (I think that would be most convenient to use) without a microcontroller? It just has to turn in one
way at the same speed all the time.
2) I found a project (you can google “simple SD audio player” it’s the first link to elm-chan .com
3) Where can I find a chargable battery that will support the need of the system?
4) More on the battery: how do I make it possible to be charged through a mini sd input (Like one of those simple SD card mp3 players)
5) Where do I find an on/off switch (like on a mp3 player) and how do I impliment this in my schematic
6) Could I make this one a double sided PCB (one side mp3 and one side stepper motor) and still make it run with one battery?
I though about buying one of those mp3 player. But since I really want to include a turning figurine and 2 PCB seems incovenient, I want to do it on my own.
The first one I will be making, will be for a friend who loves pokémon (may seem childish, but that is not the point). So it has to fit into the lower half of a pokéball with a size of 2.5″ (6,35 cm) (I will have to 3D print my own so a bit bigger is not a problem, but most mass produced once are 2.5″)
I would really appreciate all help and sorry if my English is bad/incorrect at times
Hi Stefan,
1) Is it possible to use a stepper motor (I think that would be most convenient to use) without a microcontroller? It just has to turn in one
way at the same speed all the time.
If you dont want to control the motor using microcontroller, the DC motor is the best option. Easy to connect, more torque and cheap.
2) I found a project (you can google “simple SD audio player” it’s the first link to elm-chan .com
This project can play only .wav files and not mp3. mp3 requires a decoding algorithm whereas the .wav is the raw form of musical data which can be played directly.
3) Where can I find a chargable battery that will support the need of the system?
There is a mouser catalog button at the upper right hand corner of this page, you can find it from there.
4) More on the battery: how do I make it possible to be charged through a mini sd input (Like one of those simple SD card mp3 players)
Find out the SUPPLYVOLTAGE and SUPPLYVOLTAGE_GROUND pins and connect the battery charging circuit there.
5) Where do I find an on/off switch (like on a mp3 player) and how do I impliment this in my schematic
There is a mouser catalog button at the upper right hand corner of this page, you can find it from there.
6) Could I make this one a double sided PCB (one side mp3 and one side stepper motor) and still make it run with one battery?
Yes, If you are using a 9V battery.
Thank you very much Ajish Alfred!
I also looked into DC motors but a friend of mine said it would get to hot if it were to spin at such a slow speed, is he wrong in saying that?
A 9v battery seems kind of big, would a one sided PCB still need that amount and are there rechargable 9V batteries? (never heard of any)
In case someone reads this.
I just learned about gear motors. they are basically DC motors with gears build in to produce more torque thus being able to spin at a lower RPM.
I have seen them go as low as 2 RPM.
Hi Stefan,
Sorry for the delayed reply.
Yes there are 9V rechargable batteries available like this one
and I’m using them for a long time, no issues.
Your friend could probably be wrong, I would suggest to ask him the reason for that also.
Gear motors would be perfect, low speed and high torque
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