Spectrometer reading plugin
Records spectrometer readings from the Adafruit AS7341 spectrometer sensor attached to your Pioreactor.
Available wavelengths:
415nm445nm480nm515nm555nm590nm630nm680nm
This plugin also installs a SQL table, as7341_spectrum_readings, that will store the readings.
Charts
After installation, you can add specific bands as charts. Add spec_415=1, or whatever band(s) you want, to the [ui.overview.charts] section, ex:
Hardware installation
See notes here.
How it works
- In between optical density recordings, the white-light LED on the AS7341 board turns on, and all other LEDs from the Pioreactor's LED channels turn off.
- The light is reflected back towards the board, with some wavelengths being absorbed by the culture.
- All sensors for each wavelength are recorded to MQTT and the SQLite3 database (see below)
- The onboard LED is turned off.
If od_reading is not running, this job samples continuously at the same rate as [od_reading.config].samples_per_second. When od_reading starts, the job switches to dodging mode automatically.
Each wavelength is sent to MQTT under the topics:
pioreactor/<unit>/<experiment>/spectrometer_reading/band_<xxx>
And it is also placed in the SQL table as7341_spectrum_readings.
Using a different LED
You can provide a 5mm LED instead of using the onboard one. We suggest using the following config to accomplish this:
led_current_mA=0
turn_off_leds_during_reading=0
Hardware requirements
- Requires the Adafruit board AS7341 and a StemmaQT 4pin cable.
Vendored dependency
This plugin vendors Adafruit's adafruit_as7341.py module in spectrometer_reading_plugin/_vendor/.
License and provenance are included in:
spectrometer_reading_plugin/_vendor/LICENSE_adafruit_as7341.txtspectrometer_reading_plugin/_vendor/NOTICE_adafruit_as7341.txt
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