Turn an old phone into a Guestbook that people can leave personalized messages. Great for weddings, birthdays, product launches and other special events!
Kit includes:
- Teensy 4.0
- Teensy 4.x Audio Shield
- 3.5mm TRRS Breakout Board
- A Micro SD card
- Pin headers, both pin and socket
You will need:
- A landline-style phone
- Soldering iron and solder for the pin headers
- Electrical tape, or terminal block for wire connections
- Wire cutters and strippers
Software:
Original design by Playful Technology on Youtube. You can follow his build guide, with timestamped chapters, here:
Make your own wedding audio guestbook - a step-by-step guide!
**If you have technical issues, check this forum post from the official Teensy forums to davice.