![](https://private-user-images.githubusercontent.com/24471913/269327253-6cacd215-8c39-4da9-98cf-ded7e3839234.jpg?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.QUuHkQ0sQ7VqS-6FZ9_xzEhYpqn_i-DRQ8t7vgEb1l4)
Making a bus stop bell using Arduino
- Playing WAV bell sounds from SD card with real button
- Select various sounds with button switch and OLED screen
- Use independently with Lithum battery pack / charging module, no power cable needed
- Bus stop bell button
- Arduino Nano or compartible board (as small as possible / better to avoid ESP8266 because of TMRpcm library compartibility issue)
- SD card module
- SD card
- Speaker and amp module (over 0.5W 8ohm. Piezo or small buzzer may not work)
- OLED screen (SSD1306 or whatever I2C you want)
- Lithum battery pack and charging module (each of two needed for over 5V power)
- Push tact button (for sound select)
- Slide switch (for power on/off)
- Perfboard (proper size for your case)
- Plastic case shell
![](https://private-user-images.githubusercontent.com/24471913/269325766-dea7fe14-2ac2-40fa-a665-5ae81d1f3949.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.n03ojjDwGbhpnNOJp5QlNvlyR_MdKAQP2KC0Z98NBeo)