Various Temperature Waveform Generator for Climate Chambers
Project description
ATWG
Arbitrary Temperature Waveform Generator
A various waveform shapes creating python script to control a climate chamber via PC.
Releases
Version | Date | Source | Change log |
---|---|---|---|
latest | latest.zip | ||
v0.1.1 | 2021-02-01 | v0.1.1.zip | pypi.org published |
v0.1.0 | 2020-03-09 | v0.1.0.zip | initial draft |
Supported climate chambers
- Espec Corp SH-641
- RS232 communication interface
- Espec S-2 controller
Command line interface
Options
Option | Description | Args |
---|---|---|
--sine | select sine as used waveform | |
--trapezoid | select trapezoid as used waveform | |
--minTemp=myVal | sets minimal temperature value | |
--maxTemp=myVal | sets maximal temperature value | |
[--invert] | start with lower part of wave | |
[--period=1h] | period of waveform | d:hh:mm:ss, h, m, s |
[--startTemp=25] | waves start temperature | start temperature of wave |
[--riseTime=0] | positive slew rate, used by '--trapezoid' | degree/time, T(min->max); 5C/h, 120min |
[--fallTime=0] | negative slew rate, used by '--trapezoid' | degree/time, T(max->min); 5C/h, 120min |
[--chamber=SIM] | used chamber | SIM, ESPEC_SH641 |
[--itfCfgFile=] | chambers interface configuration | default |
Example
This example starts the waveform generator in the simulation mode. The sine wave has a minimal value of 10°C, a maximum of 60°C and s start value of 30°C. A full period needs one hour.
run ./ATWG/ATWG.py --sine --chamber=SIM --minTemp=10 --maxTemp=60 --startTemp=30 --period=1h
Output
Following output is written to the command line interface while the script is active:
Arbitrary Temperature Waveform Generator
Chamber
State : Run /
Type : SIM
Tmeas : +30.02 °C
Tset : +30.06 °C
Waveform
Shape : sine
Tmin : +10.00 °C
Tmax : +60.00 °C
Period : 1h
Gradient : +2.57 °C/m
Press 'CTRL + C' for exit
Chamber driver only
Espec SH641
sh_641_drv.py realizes the interface to the climate chamber. Following instruction listing controls the chamber:
import ATWG.driver.espec.sh_641_drv as sh_641_drv # import driver
myChamber = especShSu() # call class constructor
myChamber.open() # open with interface defaults
print(myChamber.get_clima()) # get current clima
myChamber.start() # start chamber
myChamber.set_clima(clima={'temperature': 25}) # set temperature value
myChamber.stop() # stop chamber
myChamber.close() # close handle
The open procedure accepts as argument a .yml file with the chamber (RS232) configuration. In case of no argument defaults are used.
Project details
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