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Re: Selecting compatible Raspberry Pi components



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" <rowlett@cloud85.net> 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




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