Sound Effects/Audio Machine for Podcasts

thingiverse

This is a two-bank, 25-button sound effects/audio machine that triggers one sound effect (or any audio file) per button. The sound effects are read from an SD card that you populate. Switching banks from A to B gives you access to a whole new set of audio files. This device is perfect for podcasters. This design has been updated with a stop button and a bank button, allowing for double the amount of audio tracks and greater control over playback. Check the zip file for updated schematics and code. The printable Main_Case.STL does not include holes for the stop button, bank switch, or bank B LED, but you can easily drill them according to your choice of buttons/switches. Overly simple instructions: 1. Load up to 50 sound effects onto the SD card and insert it into the machine's card slot. 2. Power on the device. 3. With Bank Switch in A, press and hold one button to ready your sound effect. 4. Release the button to trigger audio from tracks 1-25. 5. With Bank Switch in B, press and hold one button to ready your sound effect. 6. Release the button to trigger audio from tracks 26-50. 7. If needed, press the Stop Button to stop what's playing. Schematics, diagrams, illustrations, and code are included in the zip file. Resistor values for the key matrix can be modified to suit your needs. Upload 'Get_Keyboard_Matrix_Values.ino' to an Arduino Uno and press each button a few times to see the values displayed in the serial monitor. Choose the highest value for each key and then add 1. For example, if repeatedly pressing button 08 gives you a highest value of 768, use 769 as the variable in the main code's 'decode' function. If there are button values close to each other, such as button 08 being 769 and button 04 being 772, you can add resistance directly to one of the button legs to increase its value. It's recommended to have at least a 10-value difference between any given buttons. If you have questions or need help, email me at bob@schoolofawareness.com. Materials needed: * 2-bank, 25-button sound effects/audio machine * SD card * Switching banks from A to B gives access to a whole new set of audio files * Stop button * Bank button * Resistors * Prototype perfboard board * Wire * Shrink tube * Screws * Adhesive rubber feet bumper pads * Glue gun and glue Note: The original prototype boards used in this project are no longer available online. You will need to cut two 2" x 5.6" (51.5 x 142mm) pieces and one 1.1" x 5.6" (27.5 x 142mm) piece from the linked prototype perfboard board. The holes on the boards are 2.54mm apart center to center, but the gap between boards needs to be 3.42mm. Green 5mm LED (1 box) wire (1 Kit) Shrink Tube Screws Adhesive Rubber Feet Bumper Pads Glue Gun and Glue