The DURR is a bracelet that alerts you by vibrating every 5 minutes (see video for how this might be useful). It came out half a year or so ago very exclusively for $120. It sounded like a simple introductory electronics project so since then, I've been meaning to create my own.
The Durr has given quite a bit of transparency in terms of what hardware they used so I just purchased what they used:
~ Murr ~
- Coin vibration motor
- ATtiny85 (the brain)
- CR2032 battery
The total cost was ~$12 and months of waiting for components to arrive.
I used the Arduino to program the ATtiny: instructions
I'm super happy with the result. ^w^ My photography doesn't do it justice, particularly that 70's brown veroboard.