Data logging device
System and methods for data logging are disclosed. The method comprising performing an initialization process, performing a data collection process in which data from a plurality of sensors is collected and time stamped, performing a time correction on the time-stamp data based on patterns of time and occupancy, performing an estimation of a light state based on the corrected time stamped data and determining an energy saving using an automatic light operation based on determined light state estimation.
1. A portable system for logging sensor data and creating energy consumption patterns in an area comprising:
a low-power and/or low accuracy clock; and
a processor in communication with a memory, the processor;
receiving data items from each of a plurality of sensors;
associating a time stamp generated by the low-power and/or low accuracy clock with each data item received from each of the plurality of sensors;
storing the received data items for a predetermined period of time; and
processing the stored data items to determine a high accuracy clock time stamp for each of the stored data items, wherein determining said high accuracy clock time stamp comprises:
determining a time usage pattern of the area during a period of receiving the data items;
approximating a correction of the time-stamp associated with the low-power and/or low accuracy clock based on the time usage pattern;
determining an occupancy pattern during a period of receiving the data items;
refining the correction based on the occupancy pattern associated with a second known time usage pattern; and
applying the correction to the time-stamp associated with the low-power and/or low accuracy of the stored data.
2. The portable system of claim 1 , further comprising:
a high-power and/or high accuracy clock.
3. The portable system of claim 2 , wherein the processor further:
obtaining at least one time sample from the high-power and/or high accuracy clock during the predetermined period of time; and
storing the at least one time sample from the high-power and/or high accuracy clock.
4. The portable system of claim 3 , wherein the at least one time sample from the high power and/or high accuracy clock is obtained on a periodic basis.
5. The portable system of claim 1 , wherein the step of processing the stored data further comprises:
transmitting the stored data items to a remote site.
6. The portable system of claim 1 , wherein the step of processing the stored data items is performed after the predetermined period of time expires.
7. The portable system of claim 1 , the step of processing the stored data items is performed during the predetermined period of time.
8. The portable system of claim 1 , further comprising:
a display displaying the stored data items.
9. The portable system of claim 1 , further comprising:
at least one of the plurality of the sensors.
10. The portable system of claim 1 , further comprising:
a communication port for receiving the data items from at least one of the plurality of sensors.
11. The portable system of claim 1 , wherein the processing further comprising:
determining at least one period of time in which a light is at least one of a state of: on and off;
determining at least one period of time in which the area is in a state of at least one of: occupied and unoccupied;
determining an average value for each of at least one period of time in which a light is in the state of on and at least one period of time in which the area is in the state of unoccupied;
determining an energy savings using an automatic light operation based on the average values; and
storing the determined values.
12. The portable system of claim 11 , wherein the processing further comprising:
determining an average energy savings using a closed-loop dimming system during the at least one period of occupancy of the area; and
determining a percentage energy savings using the closed-loop dimming system; and
storing the determined values.
13. A portable data logging device comprising:
means for receiving inputs from at least one of a plurality of devices:
a low-power and/or low accuracy clock;
a processor in communication with a memory, the processor:
receiving at least one input from the at least one of a plurality of devices;
associating a time-stamp from the low-power and/or low accuracy clock with each of the at least one input from the at least one of a plurality of devices;
storing the at least one input and associated time-stamp for a predetermined time;
generating a correction value of each of the low-power and/or low accuracy clock time-stamp after the predetermined time has expired;
applying the correction value to each of the low-power and/or low accuracy clock time-stamp, the correction being based on predetermined time and occupancy patterns,
processing the time-stamp corrected stored inputs to determine energy patterns within the stored at least one input;
determining at least one period of time in which a light is at least one of: on and off;
determining at least one period of time in which the area is in a state of at least one of: occupied and unoccupied;
determining an average value for each of at least one period of time in which a light on and at least on period of time in which the area is unoccupied;
determining an energy savings using an automatic light operation from the average values; and
storing the determined values.
14. The portable device of claim 13 , further comprising:
determining an energy savings using a closed loop dimming system.
15. The portable device of claim 14 , further comprising:
a display displaying the stored data.
16. The portable device of claim 14 , further comprising:
at least one of the plurality of devices.
17. The portable device of claim 14 , further comprising:
means for transmitting the at least one of the stored at least one input and the determined values.
18. A portable system for logging sensor data and creating energy consumption patterns in an area comprising:
a data collection device comprising:
a low-power and/or low accuracy clock; and
a processor in communication with a memory, the processor;
receiving data items from each of a plurality of sensors;
associating a time stamp generated by the low-power and/or low accuracy clock with each data item received from each of the plurality of sensors;
storing the received data items for a predetermined period of time; and
a transmitter for transmitting said stored received data items; and
a remote site:
receiving the stored data items;
processing the stored data items to determine a high power and/or high accuracy clock for each of the stored data items, wherein determining said high power and/or high accuracy clock comprises:
approximating a correction of the time-stamp associated with the low-power and/or low accuracy clock based on a known time usage pattern;
refining the correction based on a known occupancy pattern associated with a second known time usage pattern; and
applying the correction to the time-stamp associated with the low-power and/or low accuracy of the stored data.