25-01-2015, 19:42
That's right! After calcs, I keep R3 as a variable resistor just to allow some further small gain adjustment.
The software changes the Arduino ADC Vref to 1.1V, before making the readings, this way we get a better resolution and accuracy than let ADC Vref at 5V, and just raise the OP gain to reach 5V.
The software changes the Arduino ADC Vref to 1.1V, before making the readings, this way we get a better resolution and accuracy than let ADC Vref at 5V, and just raise the OP gain to reach 5V.