I measure the current consumption of some node to identify the actions performed by this node. As the start point I use the measurements for this node without any actions and try to find the distance between the idle state and states with some actions. The data set I have so far:
| ?Time (s) | Voltage_nV | distance |
| 2017-06-12T10:30:27.769 | 214685,93 | 25746,106 |
| 2017-06-12T10:30:30.701 | 5609723,62 | 5420783,796 |
| 2017-06-12T10:30:30.710 | 1325231,79 | 1136291,966 |
| 2017-06-12T10:30:30.721 | 518620,671 | 329680,847 |
| 2017-06-12T10:30:30.731 | 274424,737 | 85484,913 |
| 2017-06-12T10:30:30.741 | 265276,375 | 76336,551 |
| 2017-06-12T10:30:30.751 | 215287,108 | 26347,284 |
| 2017-06-12T10:30:30.762 | 228865,892 | 39926,068 |
| 2017-06-12T10:30:30.771 | 212372,701 | 23432,877 |
| 2017-06-12T10:30:30.802 | 201107,146 | 12167,322 |
| 2017-06-12T10:30:40.700 | 6843576,34 | 6654636,516 |
| 2017-06-12T10:30:40.710 | 1292846,59 | 1103906,766 |
| 2017-06-12T10:30:40.720 | 511380,396 | 322440,572 |
| 2017-06-12T10:30:40.730 | 344932,474 | 155992,65 |
| 2017-06-12T10:30:40.740 | 247776,864 | 58837,04 |
| 2017-06-12T10:30:40.753 | 256324,049 | 67384,225 |
| 2017-06-12T10:30:40.763 | 247071,134 | 58131,31 |
| 2017-06-12T10:30:40.774 | 219312,388 | 30372,564 |
| 2017-06-12T10:30:40.784 | 191854,231 | 2914,407 |
| 2017-06-12T10:30:40.804 | 208046,833 | 19107,009 |
As one can see some rows have very close timestamps . How can I group rows which are closer then 1 sec together? I will calculate the mean value of each group for classification and further processing.