Hi,
I am working on INA128 instrumental amplifiers for taking the signal from forearm muscle. I am operating on 5v single power supply to power up the INA128. I am dividing these 5v into two voltages with respect to 2.5 reference voltage(5v to 2.5v and 2.5v to 0v). The maximum rail is 5v and minimum rail is 0v. The output signal is swing with respect to reference voltage that is 2.5v. I am reading the signal from Arduino serial monitor. But, I am facing the problem reference voltage not stable. it is changing by the change of gain resistor. it should be on 2.5v if the reference is 2.5v. I have three electrodes 2 for inputs signal and 3rd one is reference electrode that is 2.5v. The integer values reading from 0 to 1024. The signal should swing on 512 integer if Vref is 2.5v. Please help me in this problem.
Thank You
Hamas Ahmad
I am working on INA128 instrumental amplifiers for taking the signal from forearm muscle. I am operating on 5v single power supply to power up the INA128. I am dividing these 5v into two voltages with respect to 2.5 reference voltage(5v to 2.5v and 2.5v to 0v). The maximum rail is 5v and minimum rail is 0v. The output signal is swing with respect to reference voltage that is 2.5v. I am reading the signal from Arduino serial monitor. But, I am facing the problem reference voltage not stable. it is changing by the change of gain resistor. it should be on 2.5v if the reference is 2.5v. I have three electrodes 2 for inputs signal and 3rd one is reference electrode that is 2.5v. The integer values reading from 0 to 1024. The signal should swing on 512 integer if Vref is 2.5v. Please help me in this problem.
Thank You
Hamas Ahmad
Attachments
-
14.4 KB Views: 10