Accessing OD voltage readings

Software API & Data Access
1

Hi everyone,

Is it possible to access the unprocessed voltage readings from the OD sensors directly? I’d like to log or analyze the raw ADC values before any processing/calibration. Would this require a custom script, or is there already a way to do it within the Pioreactor software?

Thanks in advance!

2

Hi @davidhcsic,

There are two solutions:

  1. To get the most raw data, try DEBUG=1 pio run od_reading from the command line. This logs the raw data from the ADC, even before converting it to a voltage. You’ll notice that we sample ~30 times per snapshot.

  2. Under the config.ini section [od_config.photodiode_channel], set both values to 90. This tells both PDs that they are looking at the culture (even if not true), and you’ll see two lines in the chart. These values are voltages, albeit they are smoothed and processed from the raw ~30 points above.