AVR Watch

Following the trend of doing things just-for-fun, this is a wrist watch using an AVR microcontroller and 7-segment display!

Features:

• Open firmware and hardware design files
• AVR and V-USB based
• Uses SMD 7-segment display – retro look!
• Integrated USB Maxim battery charger
• Shows how to scan-drive 7-segment displays without external components

Drawbacks:

• Short battery life (less than one week with a 100mAh LiPo battery)
• Tricky to hand solder (if you don’t have an hot air station)
• Makes people thinks you are crazy (I should put this one on “features”…)
• Looks like a small time-bomb, I would not wear it while in an airport

As most of my design, I made this one because I had some 7-segment display laying around and I wanted to build something with those (that’s also why I don’t have a project BOM). Also, I like the idea of having a DIY watch which looks like a lab power supply (it also displays battery level in Volts).

Read more of this post