When you notice a noisy signal in the Composer livestream, here are some actions that might help you improve the quality:
- Move the Sensor Dot around in the patch or take it out and put it back in. It could be that the contact was not sufficient to provide a high quality signal.
- It might also be that the electrodes that you used to attach the wired ECG/RES patch dried out. It’s best to try new ones or to open a new bag.
- In case of PPG, you can manually set the LED intensity and gain via the light bulb icon. An increase in intensity or gain might amplify the amplitude of the PPG signal. However, be careful since it might also saturate your signal. The default values should be sufficient to provide an acceptable PPG signal for a wide range of people (e.g. skin colors, subcutaneous fat). If they don’t work for you, just play around with the settings until you find the one thats suits you best.
- A change in body location might also work to increase the PPG signal quality. High quality signals can be obtained on the forehead, upper arm and chest (sternum). The wrist also works, but is more challenging due to the higher changes of movement artefacts.
If you want to know more on how to obtain high quality signals for your prototype, feel free to submit a support ticket.