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I am interested in the sound of train motors. (in Japan, people like me are known as “OTOTETSU”) So I decided to create a device which be able to enjoy the sound of motors everywhere.
Based on actual recordings of train sounds, it generates sounds corresponding to the speed of the vehicle. For example, you can use it while driving a car to enjoy the sensation of driving a train.
I made it portable by M5Stack which using the built-in accelerometer to get the speed. And it can be connected to earphone, so it can be used while traveling in various vehicle.
By connecting a smart pocket watch made with M5Dial via Bluetooth, you can check the speed while enjoying the motor sound.
In this video, you can enjoy two types of train motor sounds. I plan to add more sound sources in the future.
System Overview1. Prototyping by M5Core2
- Calculate speed from the built-in accelerometer.
- Include a motor sound source data.
- Generate sound waves corresponding to the speed.
2. Expanding functionality using custom PCB
- Output audio data as analog with a DA converter
- Connect to an external speaker or earphones.
- Support speed acquisition via pulse input.
3. Designing user interfaces with M5Dial
- Display speed on the meter via Bluetooth connection with M5Core2.
- Include a pocket watch function.
- Allow time adjustment using a rotary encoder.
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