Resolution of Grove EMG detector very low because of low range

Products & Technology Grove
#1

Hi all,

I have tried the grove EMG detector with a Sparkfun RedBoard Qwiic. It works well and shows me changes in muscle activity. The issue is that the minimum value is somewhere around 290 and the maximum value somewhere around 360. This is a very small range, so the resolution is not very high. I attached a screenshot of the graph.

Screen Shot 2020-06-20 at 2.02.02 PM
Screen Shot 2020-06-20 at 2.02.02 PM2348×1462 321 KB

Is there a possibility for me to change this? I tried it with 3.3 and 5V as input.

Thanks,
Patrick

#2

This can be solved theoretically by adjusting the resistance of the operational amplifier on the schematic diagram. You can actually damage the sensor, which I don’t recommend.