This Datalogger and simple to use but with great performance. The base, concise and intuitive, has been studied by Marco Russiani. Then we supplemented with calculations to measure resistances and temperatures, with the PT100, Pt500 and PT1000 three or four wires.
The temperature calculation from the resistance of Platinum resistors (PTxxx) is done by means of a polynomial formula, with an average absolute error of 0.015% throughout the temperature range, from -200° to +850° C.
Are also implemented the calculations for probes:
- Lm35 – From 0° C to 150° C with an accuracy of +/-0.5° C)
- TSIC501 – From -10° C to 60° C with an accuracy of +/-0.2° C
- UVM-30A – UV index from 0 to 11
- ML8511 – UV from 0 to 15 MW
For probes LM35, TSIC501, UVM-30A and ML8511 might be enough a Theremino Master. But for high precision measurements and especially for RTD (PT100 and 1000) It is good Add a Theremino Adc24.
Learn more about sensors in These paginand and in Adc24 documentation.
📷A Datalogger controllable via radioWith the Theremino Logger on a Tablet TCU you get a system similar to these without spending thousands of dollars. The result is a complete datalogger controllable via radio, You can store data for years, consuming only 2 Watts (less than 500 but to 5 Volts). The complete system can be enclosed in a watertight container, without ever needing to open it. The radio is controlled via TeamViewer and your data is accessible on your local network, through Windows folders.
Mini Instructions
- The Log file is written next to the executable and can be viewed with KST (as explained in the previous “Theremino Simple Logger”). Currently the only one who knows well enough KST is Marco Russiani, If you have trouble configuring it let him know.
- The sampling interval can be very frequent (currently the maximum is 60 samples per second) but under the second you do not have a great precision and get tired enough the CPU. To reduce the work to the CPU is good to keep the application minimized.
- Each line of LOG (also presented in the second row of the application), consists of the date, followed by the Julian date (in days and fractions) and followed by the values of the sensors are enabled. The field separator is a semicolon.
- The line “Value” view individual sensor readings. See them in real time is useful in trials.
- In row “Slot” you set the slots for individual sensors. These numbers must correspond to the numbers of slots that you set in the HAL.
- In row “Type” you set the sensor type.
- In row “Multiply” you set the multiplication factor, for fine adjustment of the gain (the slope of the calibration curve). Normally this value is “1”. See the schematic Adc24 documentation.
- In row “Trim value” you set the factor of addition, for fine adjustment of final value (you move the calibration curve up or down).
- The new buttons “Zero set” We are from version 3.3 onwards to the “Tara” easily. Mostly it is used for linear transducers and load cells. Using them is easy, moves the sensor in the zero position and the button is pressed.
Special notes for channels with the types “RES-3” or “Res-4” or “PTxxx”
- With these types using two Slots.
- The first Slot is written in the line box “Slot” (for example, 10).
- The second Slot is the Slot following (for example, 11).
- The first slot is the voltage value measured.
- The second Slot is the value of the measured current divided by the current measuring resistor (normally 10 k).
- In row “Multiply” do not set “1”, as with other sensors, but you set the value of the current measurement resistor (usually 10000).
Display data with KST
📷 📷
KST is a great OpenSource Viewer for LOG files. View log files in real time, While they are written, as shown in This video.
KST also supports huge files and displays them and filters in every possible way. It is also very easy zoom and browse the files in the past. The perfect solution for all needs scientific logging. With patience, enquiring on the Web and possibly asking for help in Marco Russiani, You can make all kinds of visualization KST. Probably you can also use it to send files MySql on WEB. Use KST is not easy at all, is a great software and the great results you must pay with patience.
Download documentation on KST prepared by Marco RussianiKST2_Help_for_Theremino_Logger_ENG.pdf
Theremino Logger downloads – Version 3.4Theremino_Logger_V3.4.zip
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