Hi
First things first the LED decade is a nice idea and a practical one (i really liked my LED wrist watch
), still regarding the USB supply i have a hint about a
possible option and i hope it will make a difference for David ... but the are 2 uneasy details.
1. It is a 1bit B/W graph LCD 96x64, with LED backlight (extremely popular NOKIA LCD spare)
2. It is available at a good price on Alibaba (China).
the good aspects about this solution are
1. the fact that it's cheap 0.70$US /100 (one hundred pcs), above 1k i saw that is possible to shave off about 9-11 cents
2. has SW support (i used it with cortex M0/M3 but HAL drivers for atmega can be made)
3. needs only 4 wires for data SDA/SCL/RST/CE
4. there 2 display options one with solderable flex PCB type connector, another with hirose DS-10 connector both share the same physical layout and dimensions
5. the DS-10 connector version has a very neat 4k color upgrade option (another LCD from nokia)
6. IMHO this LCD will be around at least for the next 5 years.
If this can be usable i would be more than happy to provide the details
Best regards
Ovidiu