I'm having trouble to read the voltage value of the potenciometer's wiper "leg".
I connected it to the 5V-GND of the Arduino, and connect the wiper into A0 analog pin. At 100ohms, I should have read 2.5V, but instead, I got 0,49V! I'm using Matlab instead of IDE.
I set the A0 pin in two different ways to see if it was a syntax error :
pinMode(A0,'input') and pinMode(14, 'input');
but none worked as supposed.Therefore, I connected the Arduino's 5V to A0 to see if I would get 5V, no problem. But with the potentiometer it's inconsistent.
Do I really have to set A0 as input(I believe I dont) in order to "tell" Arduino to increase its impedance?
Do I need to use any special potenciometer functions to read the values?(I believe I dont either)
This is the script I have been trying to run:
a.pinMode(12,'output'); %DIR A
a.pinMode(13,'output'); %DIR B
a.pinMode(9,'output'); %BRAKE A
a.pinMode(8,'output'); %BRAKE B
a.pinMode(3,'output'); %PWM A
a.pinMode(11,'output'); %PWM B
a.pinMode(14,'input'); % ??
But the values returned by a.analogRead(0) don't correspond to the ones read by the multimeter