Zuidhorn - Node 1



Details on the piezoelectric sensors


Details on the control box


Meaning of each column in the raw data

Example Meaning
583143230.821 Timestamp in UNIX epoch
64,1,95,1, 4 channels, standard deviation of the last 2 seconds in the piezoelectric voltage. This is used as a 'trigger' to decide when to send data out and flash light. As of March 2020, there are only two active channels.
418.013,2.0,216.007,108.003, 4 channels, raw data of the voltmeters connected to the piezos in mV. As of March 2020, there are only two active channels.
81.7, Averaged current flow, in mA, used in running the control box.
678, This field increments +1 each time someone steps in one piezo. Note that this resets each time the data collection program is updated/restarted.
13.55,208.8, Voltage (V) and current flow (mA) in the main battery. The current measurement is limited to 1.25 A.
13.56,83.2, Voltage (V) and current flow (mA) drained by the data logging system.
13.58,2.0, Voltage (V) and current flow (mA) drained by the future expansion branches (more sensors, etc.).
7.3,-128,98.4,-128, Climatic parameters (Temperature (C), free-slot, relative humidity (%), free-slot.
0.0, Rate of 'errors or timeouts' in reading the sensors in the box.
208.3,13.52, Redundant measurement of the current (mA) and voltage (V) of the main battery. The current measurement is limited to 3.2 A.
-1,-1,-1,-1, Free columns for future data logging.
144, Duration of one measurement recording cycle (ms). This is the ultimate limit of the measurement frequency.
0.21, Usage (out of 1) of the CPU in the control box.
21, Usage (%) of the storage in the control box.
326136,442820, RAM memory free and RAM memory total in bytes in the control box.
0.0, Free storage (%) in the RAM. This type of storage is used for intermediate results in some scripts running in the control box.
14243811,26268176 Total bytes received and transmitted in the current session. This number resets each time the control box is restarted.