I want to acquire an EMG signal through an InAmp INA333. Since ECG and EMG are of similar nature, I am using the same circuit as in the link below:
http://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/14/8154.rld.jpg
Now, the output of INA333 is bipolar. I want to feed this to an Arduino. But it only accepts 0-5V. How do I convert the output of INA333 so that I can feed it to the Arduino, suitably? Please let me know. Thanks.
It is sufficient you connect the REF input of the INA333 to a mid-range voltage V_REF (2.5V could be a convenient value in your case) to get an output Vout+V_REF (this can be easily shown by direct analysis of the negative feedback opamp circuit driving the output of the INA333) that is within the 0-5V input range of your Arduino board.
Hello Bhaskar,
You can also think of a single-opamp differential amplifier with unity gain or even higher. Feed the differential output from your INA to this DIFF-AMP and then get the single ended output without compromising your signal swings and supply voltages.
Hope this works exactly as what you want to do!
Best Luck!
Bhaskar,
It seems that your signal is analog. You want to input it to Aruino. Well, is that input analog or digital? What is the range of the input voltage. More data is required to give more precise answer to your question. I can answer you question in one sentence you can use clamping circuits to change any DC levels of any waveform .
Thank you Paolo and Prasanna, for your suggestions.
Abdelhalim, yes my input to Arduino is analog. The range is 0-5V. I looked up clamping circuits and have implemented the circuit. I have to perform simulations to ensure the correct functionality.
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