Gravity Analog EMG Sensor - signal Sampling with Oscilloscope (is 50 Hz sine expected?)
Marko.Aksentijević 2025-09-11 04:17:30 95 Views2 Replies Hello,
I just received the Gravity Analog EMG Sensor and, before trying Arduino sampling, I wanted to observe the output directly on an oscilloscope. I connected the sensor according to the instructions on the wiki page.
Here is a screenshot from the oscilloscope: the waveform looks like a sine wave with a 50 Hz period.
Is this behavior expected? I am not sure whether this is normal for the sensor when idle, or if it indicates an issue with my setup. Could you please clarify?
Thank you.
Put the sensor’s input electrodes shorted together (or touch both active electrodes together). If the 50 Hz disappears or falls dramatically, the amplifier is fine and the interference is coming from the electrode leads picking up the field.
ahsrab.rifat Dear Ahsrab,
First of all, thank you for your answer.
I tried with electrodes shorted together - 50 Hz doesn't disappear, it only became more sharper. Here are the photos:
..and then I just followed the tutorial from here: https://wiki.dfrobot.com/Analog_EMG_Sensor_by_OYMotion_SKU_SEN0240
And when I connected Arduino accordingly and flashed and started the program, I see very strange output:
so right now I am a little but confused and unsure about how to proceed further… If you have any advice, it will be very valuable.
Best regards,
Marko
