Desk Phone Mic & Sampler - Custom 1 ECE342-W22

Analog
Arduino
PCB
Junior Design

The Desk Phone Microphone & Sampler is a USB-compatible device meant for public address and live performance. While connected to a USB device (likely a computer) and while in either of the two keyboard modes, pressing buttons on the dialpad will send specific character signals: Mode 1 signals are [1 2 3 4 5 6 7 8 9 0] and Mode 2 signals are [z x c v b n m ,] These keypresses work with a DJ software, Serato DJ Pro, to jump to a specific time point in a song (Mode 1), and play sound samples (Mode 2). A red LED at the bottom-right corner of the desk phone indicates the mode. Slow blinking indicates Mode 1, while fast blinking indicates Mode 2. Mode 3 is indicated by a continuously lit LED. Pressing 6 on the dialpad will put the device in Mode 1, pressing # on the dialpad will put the device in Mode 2, and pressing FLASH will put the device in Mode 3. The corded phone serves as a PA microphone. Picking it up off the dock unmutes it. Sliding a switch on the side turns on a voice modulator that creates a strobe effect, accomplished with a 555-MOSFET. While in Mode 3, pressing buttons starts recording from the microphone, stops recording, overwrites, and plays the recording back through the final output. The final output signal is delivered through a mono audio connection, with a 1/4" TS male jack. This signal has a voltage less than 100mV peak-to-peak with negligible DC offset. Future Improvement Ideas: --Reduce signal noise in Mode 3 --Increase I/O of Arduino using shift register, scanning array PCB, and code --Additional choices for voice modulation --LCD to indicate mode and current action --Multiple RGB LEDs

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Artifacts

Name Description
Operational Video Designer using the device with DJ software.   Link
Executive Project Summary Project summary, approach, timeline, and lessons   Link
Executive Project Summary Project summary, approach, timeline, and lessons (Downloadable File)   Download