Hello, I have read similar posts, and want to take a final decision about this.
My project is up and running at real work in my farm.
Is a controller that send signals for a solar cattle feeder.
It runs on small a Kicad PCB, and has no instability issues.
Reads initial work parameters from a CellPhone connected with HC05.
The questions are:
A. we have 9 not connected pins: 4, 13, 14, 15, 18, 23, 24, 25 and 26.
In PCB they are not wired, in soft they are not programmed.
Any recommendation ?
B. reset pin has a 10k pull up resistor, but not the protecting diode that Arduino R3 has in parallel with the resistor. We use the reset line only when uploading code to the micro, when in service it is not used. Need I ti include the diode anyway ? Any special diode ?
I attach the circuit
Thanks very much,