SEN0240 emg sensor reading problem

I recently got SEN0240 emg sensor and run the sample code from dfrobot wiki, but I found that there's no obvious difference between making a fist or relaxing.
I'm using bluno nano and Arduino 1.8.12 IDE.
Can anyone help?
Thanks!
I'm using bluno nano and Arduino 1.8.12 IDE.
Can anyone help?
Thanks!
2020-12-07 10:39:10 Regarding this type of sensor, you need to know how to use it, that is, to put them close to the skin, not simply pressing, but tied to the arm with a rope
347945801
