I've been assigned in a project where I have to communicate mpr121 capacitive touch sensing keyboard with a microcotroller, aside the touch detection one of the requests for the project was capacitance measurement from touch pins and displaying it's change with graphs. I know that I can get the capacity of the electrode from 2-nd filtered data registers that contains 10 bits of data, 2 msb and 8 lsb, my question is do all these 10 bits represent the capacity or are they used for some other info rather then only capacity? Thank you.
This 10 bit data from mpr121 will tell you about the intensity of touch. If you touch is pressed hard the value will be higher and if its a slight touch then value will be low.
What about the capacity itself? How can I get its value?
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I've read the datasheet more than enough, here is some part of it "The 2nd level filter result is 10bit and stored in the output data registers 0x04~0x1D as the immediate capacitance of each sensing input", you talk about the internet as if what we're doing here is not a part of it