How's it going? I am ordering a couple custom circuit cards that will be able to fit on to an Arduino Mega 2560.
I have 2 LM35s going to A2 and A3 analog input pins on Arduino.
I have an encoder going to input A15.
I have an LCD going to pin 14 (TX3).
Here's the first question:
In order to get the best readings out the LM35s, should I pull low all other analog pins to prevent random noise?
And the second:
When testing a demo board, I destroyed pin A15 and (consequently) the whole bus. To counter a scenario like that happening again, I decided to put 2 separate solderable jumper pads going to distinct digital and analog pins in the event one pin breaks.
So, my trace for the LCD has the original input to 14, plus a jumper to 16 and 18. If 14 fails, solder the jumper to 16 and use that instead.
Is that a good counter to the problem of destroying pins?
Thanks,
Anthony