What is an MP3 Trigger and what does it do?
An MP3 Trigger is an electronic device that uses a CPU to process information from an Arduino, or similar microcontroller. This device uses a Micro SD card loaded with sound files (.mp3) and plays sounds randomly, and when cued from the microcontroller. You can use a 3.5 Audio jack as an output to powered speakers or use it to go to an amplifier for non-powered speakers.
Why do we use/need it?
We use this MP3 trigger to play all of R2's sounds. It communicates with one of two slave Arduino Unos via I2C communication. When a button is pressed on the xBox 360 remote, it sends the signal to the reciever plugged into the Arduino Mega. The Mega then processes the information and sends the code over to the Arduino Uno via I2C communication. The Uno then processes the information it has received, ane sends a ground to the trigger pins located on the trigger. The trigger's ICs processes it and plays the sound requested. All of this happens in less than a second, as the baud rate is 9,600.
Last edited on: 2/27/17