I'd go with a Pi 3, 7 inch touchscreen, and 3 - 10 18650 lithium cells.
You can get little switch mode voltage regulators on Aliexpress or eBay for
a couple bucks. When you're not using it as a portable you've got 4 USB
jacks, WiFi, Bluetooth, CAT5 ethernet., HDMI. Not sure about Debian
drivers for the display, they come with Raspbian (almost the same).
On May 3, 2020 12:59 PM, "Richard Owlett" <[email protected]> wrote:
> I've been thinking about what a handheld computer COULD be.
> My image is heavily influenced by my recollection of Palm Pilot.
>
> My project goals are two-fold
> 1. create a personal data logger reminiscent of a Palm Pilot
> 2. become familiar with Raspberry Pi while using Debian as the OS
>
> My needs include:
> >2 hours battery life
> 4" by 7" nominal form factor
> touch screen input using a stylus
> display will be entirely character mode (40 chars/line would be OK)
> OS GUI not required except to say where stylus is
> OS shall be Debian {possibly with non-free drivers}
>
> I've not found found user friendly selection guides.
> A typical problem was not being able to know if a selection of components
> had mutually compatible I/O (electrical and physical).
>
> Suggestions for suitable selection guides?
> TIA
>
>
>
>
