Acquire data from temperature/RH probe and thermocouples using a Campbell Scientific CR1000 and send serial data messages to DAQFactory.
The CR1000 is powered from a 12V power adapter. Be sure to turn the logger off before adding or removing sensors. Its program will run automatically whenever power is applied.
Four Type K thermocouples are connected to differential inputs 1-4:
Note standard thermocouple wiring convention is red = negative.
| Description | Color | CR1000 |
|---|---|---|
| Thermocouple #1 signal (+) | yellow | DF 1 H (SE1) |
| Thermocouple #1 ground (-) | red | DF 1 L (SE2) |
| Thermocouple #2 signal (+) | yellow | DF 2 H (SE3) |
| Thermocouple #2 ground (-) | red | DF 2 L (SE4) |
| Thermocouple #3 signal (+) | yellow | DF 3 H (SE5) |
| Thermocouple #3 ground (-) | red | DF 3 L (SE6) |
| Thermocouple #4 signal (+) | yellow | DF 4 H (SE7) |
| Thermocouple #4 ground (-) | red | DF 4 L (SE8) |
The temperature/relative humidity probe (CS215; Campbell Scientific) is connected to port C1 and data is
| Description | Color | CR1000 |
|---|---|---|
| Power input | red | 12V |
| Power ground | black | G |
| Power ground | white | G |
| SDI-12 data | green | C1 |
| shield | clear | G |
These sensors were removed
Six soil moisture & temperature probes
(5TM; Decagon Devices)
are connected to the first SDI-12 port using three sets of screw terminals.
The SDI-12 addresses of the sensors are 7, 8, 9, A, B, C. The
address is used in variable names and serial data messages to uniquely identify
the sensor.
Note legacy color scheme for 5TM sensors is white = power. Connecting the red wire to a power source will destroy these sensors.
Use a serial cable and usb serial adapter, if needed, to connect the DAQFactory
computer to the RS-232 port of the CR1000. The serial port configuration is:
- Baud rate:
115200 - Data bits:
8 - Parity:
none - Stop bits:
1
Copy the custom protocol file CR1000.ddp into the DAQFactory installation folder
and restart DAQFactory. Then create a new serial device using the above settings
and specify the custom protocol "CR1000" for that device.
One serial data record is sent by the datalogger after each scan.
- Each record:
- is prefixed with
TC - and is delimited with a carriage return and line feed (
\r\n) - contains thermocouple (TC) data for differential input channels 1, 2, 3, and 4, respectively
- is prefixed with
- However:
- the DAQFactory protocol file skips over thermocouple #3 (not connected)
The logger queries sensors for new values and records data every 5 seconds. The record is stored to internal memory in a ring-fill mode (e.g. newest overwrites oldest when full).
- Base name:
compost_soil - Record interval: 5 seconds
- Timestamp anchor: prior interval, e.g. 00:02:00 = avg(00:01:00-00:01:59)
Soil probe temperature is obtained from a thermistor in the overmold.
Volumetric water content is calculated from the measured apparent
dielectric permittivity value using the Topp equation[ref],
though users may wish to explore using a different media-specific calibration
curve.
| Field name | Units | Description |
|---|---|---|
| TC1_tmpr_Avg | degC | temperature from DF1 thermocouple |
| TC2_tmpr_Avg | degC | temperature from DF2 thermocouple |
| TC3_tmpr_Avg | degC | temperature from DF3 thermocouple |
| TC4_tmpr_Avg | degC | temperature from DF4 thermocouple |
| CS215_T_Avg | degC | temperature from CS215 probe |
| CS215_RH_Avg | percent | relative humidity from CS215 probe |
- Original software contributions are licensed under the MIT License
- Screenshots and documentation are licensed under CC-BY-SA-4.0 (Creative Commons Attribution-ShareAlike 4.0 International)
-
Campbell Scientific. CR1000 Datalogger Operator's Manual. Retrieved 2019-10-24. Online: https://s.campbellsci.com/documents/us/manuals/cr1000.pdf
-
Campbell Scientific. CS215 Temperature and Relative Humidity Probe Instruction Manual. Online: https://s.campbellsci.com/documents/us/manuals/cs215.pdf
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Decagon Devices. 5TM Water Content and Temperature Sensors Operator's Manual. Version July 10, 2017. Online: http://library.metergroup.com/Retired%20and%20Discontinued/Manuals/13441_5TM_Web.pdf