I have been trying to do EMG sensor acquisition with the STM32F4 kit. I've tested the ADC functionality of my code using a potentiometer and it does work well. However, when I am connecting the sensors analog output to the GPIO pin of the STM kit, I just see the random ADC values.
I've used the REF voltage as VCC/2 through the PWR block. I've placed the electrodes (3-lead) as suggested in http://bitalino.com/datasheets/EMG_Sensor_Datasheet.pdf
Please find the schema below that I've used. (VCC = 3.3V)https://www.dropbox.com/s/a2egp9lhx1wvp ... a.PNG?dl=0
Any help or suggestion is greatly appreciated. Thanks.
p.s. I am using the BITalino Freestyle BT Kit.