-testing 4" tft with touch:
while testing the input i saw drawing only pixel is not enough. the esp32 is fast doing this, but now i draw vectors from point to point on the tft. To draw a line while the touch pen only touches the tft(sensor-field) the contact has to be registered to.
-testing LoRa with duplex communication:
it seems with the spreading factor i can send 150 bytes max. ..its something for the start. I would love to send 1 or 2 k bytes to send a complex drawn picture. I'll have to look into the LoRa settings, if that possible and what consequences it has on the distance.
-getting 4" touch input (x/y coordinates) to 2d array and prepare so send via Lora package(s):
I might fill a large 2d-array of coordinates and send it in smaller packages.
-building 2 devices with 4" touch-screen, battery, LoRa-Module may also with an extra Bluetooth (pre-paired HC-04 module). I printed out a nice case already. Now its time to stuff it all in there. Also i have to find out if the Lora module and the TFT likes each other or not - i might change a few pin assignments of one of those modules. Having seen quite small bandwidth of the LoRa test (and i was not surprised) i was thinking about a real-time" Bluetooth communication. With that a picture could be send instantly while drawing. .. would be cool, but the devices would need a menu to change in that mode. I would use HC-04 modules on serial 2, which would get paired on another set-up.