You can use a 10uf capacitor with output. I wish, your problem will be solved.

Physically you can use a differential amplifier or analog filter (probably you need a low-pass filter). However, an easier method would be taking averages for the data in time intervals.

1. Make sure you are using a differential amplifier for your IA with differential inputs and outputs.

2. Have the inputs filtered to match your desired signal bandwidth.

3. The the bandwidth of your differential IA to fit your requirements.

4. If your IA has differential outputs, set the differential and common mode filter cutoffs to match your ADC sampling rate requirements.

5. In software, use software averaging to further improve your SNR. Remember that if you average N-time, you improve the SNR by SQRT(N) times.

Dear Student Mehta Ds ,

Some types of sensor always need filters. Amplified electrical signals, as you may know, there are several harmonics that make up the signal, and some may have greater intensity which make it difficult to read the signal of interest.

A good amplifier must have a signal filter capable of attenuating certain frequencies that are interpreted as noise.

If not, I think you should use some applications of digital filters or even with traditional electronic components.

Here are some tips:

https://www.youtube.com/watch?v=KzdsOhwVtms

https://www.youtube.com/watch?v=DmGbMletks0

https://www.youtube.com/watch?v=CPpOJsHuMsM

and

https://playground.arduino.cc/Code/Filters/

https://www.megunolink.com/articles/coding/3-methods-filter-noisy-arduino-measurements/

https://github.com/jeroendoggen/Arduino-signal-filtering-library

Good luck and I hope it helps you.

Regards,

Prof. Wiltgen

normally a capacitor solve the issue,

Use multiple RC filters. Or Use Wein bridge to find the difference in the signals and give a feedback to the instrumentation amplifier with a op-amp amplifier and a comparator.

The noise due to power line frequency (at 50 Hz or other values) can be reduced by using notch filter at 50 Hz.

Arduinos are notoriously noisy. Arduino power supplies are not well filtered, so you get a lot of noise that way. If you run through the USB port, you get any noise that might be coming from the computer. Have you ever used a pair of USB powered speakers? Same problem. Make sure you are using a linear regulated power supply, not a switching supply (unless it is very high quality). The other option is to go with batteries. If you run the Arduino through the DC jack, make sure to use at least 7V (lithium 2S if using batteries) to get the full 5V out of the on-board regulator. If your VCC is low, your analog readings will seem too high because the internal AREF is derived from that and assumed to be 5V. Best of luck!

There are several ways to help eliminate noise in sensor wires.

1. Use twisted pair wire

2. Use shielded wire, grounded at one end at the system voltage reference point.

3. Both 1 and 2 (which is the most common)

4. Separation between the source of the noise and the victim of the noise.

5. Metal ferrite barrier between the source of the noise and the victim

5. Filter out the noise - ferrite beads, common mode choke, electronic filter, etc.

If the noise is generated by the sensor power source, you must add a filter to that.

It helps to know what is the source of the noise, what type of noise (Normal mode, Common Mode), frequency of the noise.

If you want to discuss this more, you can contact me at [email protected].

High sensor voltage and low gain of the instrumentation amplifier gives rise to lower noise.

Agree with above options -

Power supply decoupling capacitor (10uF),

using Differential amp - greatly reduces common mode noise, etc..

Also try to match the input impedance of the amp and the output impedance of the pressure sensor - usually a terminating resistor will be enough.

Make sure your operating /Measuring range is within the linear portion of the sensor's load curve..

Good luck.

Shiva.