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A question regarding emotiv_values and emotiv_data values. #286

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AkumaShogun opened this issue Nov 23, 2018 · 0 comments
Open

A question regarding emotiv_values and emotiv_data values. #286

AkumaShogun opened this issue Nov 23, 2018 · 0 comments

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@AkumaShogun
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I want to use the data from the emotiv but I need its values in Voltage.

I've read the documentation thoroughly and I've found myself with a question. What's the difference between the data written by having write_decrypted and write_values set as True?

If write_values is set as true it writes the sensor and quality values and saves them to a 'emotiv_values_*.csv' file, of which I've obtained the following data:

Timestamp F3 Value F3 Quality FC5 Value FC5 Quality F7 Value F7 Quality T7 Value T7 Quality P7 Value P7 Quality O1 Value O1 Quality O2 Value O2 Quality P8 Value P8 Quality T8 Value T8 Quality F8 Value F8 Quality AF4 Value AF4 Quality FC6 Value FC6 Quality F4 Value F4 Quality AF3 Value AF3 Quality X Value Y Value Z Value
2018-11-23 13:10:55.985753 4305.12121169 0 4179.42424201 0 4308.21212078 0 4221.15151473 0 4452.96969652 0 4369.51515108 0 4277.81818139 0 4496.24242379 0 3766.78787841 0 4423.60606016 0 4214.45454503 0 4289.15151472 0 4155.2121208 0 4124.81818141 0 42 42 ?
2018-11-23 13:10:55.987023 4305.12121169 0 4179.42424201 0 4308.21212078 0 4221.15151473 0 4452.96969652 0 4369.51515108 0 4277.81818139 0 4496.24242379 0 3766.78787841 0 4423.60606016 0 4214.45454503 0 4289.15151472 0 4155.2121208 0 4124.81818141 0 42 42 ?
2018-11-23 13:10:55.988165 4305.12121169 0 4179.42424201 0 4308.21212078 0 4221.15151473 0 4452.96969652 0 4369.51515108 0 4277.81818139 0 4496.24242379 0 3766.78787841 0 4423.60606016 0 4214.45454503 0 4289.15151472 0 4155.2121208 0 4124.81818141 0 42 42 ?
2018-11-23 13:10:55.989936 4350.96969653 0 4149.03030262 0 4322.6363632 0 4197.45454503 0 4443.69696925 0 4361.78787835 0 4310.27272684 0 4507.57575713 0 3777.60606023 0 4426.18181774 0 4202.60606019 0 4304.09090866 0 4174.78787837 0 4068.15151474 0 42 42 ?
2018-11-23 13:10:55.993383 4322.12121169 0 4122.24242383 0 4735.78787831 0 4171.18181776 0 4449.36363592 0 4337.06060563 0 4337.57575714 0 4466.87878743 0 3779.66666629 0 4398.36363592 0 4102.15151474 0 4292.75757533 0 4170.15151473 0 4033.12121172 0 42 42 ?
2018-11-23 13:10:55.994890 4322.12121169 0 4122.24242383 0 4735.78787831 0 4171.18181776 0 4449.36363592 0 4337.06060563 0 4337.57575714 0 4466.87878743 0 3779.66666629 0 4398.36363592 0 4102.15151474 0 4292.75757533 0 4170.15151473 0 4033.12121172 0 42 42 ?
2018-11-23 13:10:55.997045 4280.39393897 0 4213.93939352 0 4349.9393935 0 4215.99999958 0 4475.12121167 0 4350.45454502 0 4318.51515108 0 4482.33333289 0 3769.8787875 0 4396.30302986 0 4299.45454502 0 4282.45454503 0 4180.45454504 0 4141.30302989 0 42 42 ?
2018-11-23 13:10:55.998922 4270.09090866 0 4194.87878746 0 4382.39393896 0 4172.72727231 0 4520.96969652 0 4347.87878744 0 4297.90909048 0 4492.12121167 0 3748.75757538 0 4409.69696926 0 4351.99999956 0 4270.60606018 0 4146.45454504 0 4210.33333291 0 42 42 ?
2018-11-23 13:10:56.000971 4270.09090866 0 4194.87878746 0 4382.39393896 0 4080.51515111 0 4520.96969652 0 4330.87878745 0 4297.90909048 0 4492.12121167 0 3748.75757538 0 4409.69696926 0 4351.99999956 0 4270.60606018 0 4146.45454504 0 4210.33333291 0 42 42 ?
2018-11-23 13:10:56.004599 4238.66666624 0 4187.66666625 0 4459.66666622 0 4134.60606019 0 4518.39393894 0 4345.30302987 0 4291.7272723 0 4482.33333289 0 3745.15151478 0 4410.72727229 0 4362.30302987 0 4255.15151473 0 4120.69696928 0 4230.424242 0 42 42 ?
2018-11-23 13:10:56.006204 4258.24242382 0 4171.18181776 0 4500.87878743 0 4234.54545412 0 4530.7575753 0 4374.66666623 0 4315.42424199 0 4496.75757531 0 3737.42424205 0 4407.6363632 0 4178.90909049 0 4262.36363594 0 4129.45454504 0 4186.63636322 0 42 42 ?
2018-11-23 13:10:56.012223 4278.84848442 0 4206.21212079 4.1212121208 4586.90909045 0 4262.87878745 0 4498.81818137 0 4377.2424238 0 4365.90909047 0 4501.90909046 0 3749.78787841 0 4375.18181774 0 4063.51515111 0 4272.66666624 0 4145.93939352 0 4146.45454504 0 42 42 ?
2018-11-23 13:10:56.014117 4278.84848442 0 4206.21212079 4.1212121208 4586.90909045 0 4262.87878745 0 4498.81818137 0 4377.2424238 0 4365.90909047 0 4501.90909046 0 3749.78787841 0 4375.18181774 0 4063.51515111 0 4272.66666624 0 4145.93939352 0 4146.45454504 0 42 42 ?
2018-11-23 13:10:56.023237 4278.84848442 0 4206.21212079 4.1212121208 4586.90909045 0 4262.87878745 0 4498.81818137 0 4377.2424238 0 4365.90909047 0 4501.90909046 0 3749.78787841 0 4375.18181774 0 4063.51515111 0 4272.66666624 0 4145.93939352 0 4146.45454504 0 42 42 ?
2018-11-23 13:10:56.030015 4260.81818139 0 4240.21212079 4.1212121208 4501.90909046 0 4271.12121169 0 4512.21212076 0 4384.45454502 0 4425.66666622 0 4502.93939349 0 3761.12121175 0 4342.72727229 0 4047.03030263 0 4288.12121169 0 4170.66666625 0 4141.8181814 12.3636363624 42 42 ?

However, if write_decrypted is set as True, it says that it writes the data received after decrypting it. And then saves this data to a 'emokit_data_*.csv' file.
How is this decrypted data different from the sensor values and quality values? Given that I obtain something similar to this when write_decrypted is enabled:

2018-11-22 15:34:03.093292 89 129 38 0 247 228 161 111 129 2 37 8 79 0 0 0 2 9 24 131 220 106 134 98 2 232 16 223 83 107 104 187
2018-11-22 15:34:03.093769 109 129 26 0 151 228 33 111 128 242 35 136 72 192 0 0 2 9 40 130 220 103 134 78 1 200 19 95 73 109 104 191
2018-11-22 15:34:03.094144 110 129 18 0 135 228 161 111 128 250 35 152 72 192 0 0 2 8 120 130 220 99 134 46 1 168 19 31 58 109 105 183
2018-11-22 15:34:03.096510 111 129 18 0 183 230 97 102 129 6 35 72 72 128 0 0 2 8 184 128 156 102 134 58 1 184 19 31 55 109 106 179
2018-11-22 15:34:03.098126 112 128 250 0 167 231 33 103 129 2 35 88 72 64 0 0 2 9 136 129 156 105 134 86 2 8 19 159 70 109 106 251

So, to recap, I'd like to know the difference between these two options.

As of now, I've assumed that the 'emotiv_values_*.csv' file was the correct one since I can somewhat make sense of it if I substract 4096 from it and multiply it by 0.51 according to the resolution and LSB value of the emotiv. Am I correct in this assumption?

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