PWM intensity - stirring and air_bubbler

Hi @Eleni_M,

Generally it’s not possible to change the PWM intensity, at least not from the default UI. How are you trying to change the intensity?


You can enable changing the stirring intensity / duty-cycle from the UI with the following change:

Another name for PWM intensity is “duty-cycle”, which we use internally.

  1. SSH into your leader Pioreactor
  2. nano /var/www/pioreactorui/contrib/jobs/00_stirring.yaml
  3. Add the following the bottom of the file:
  - key: duty_cycle
    unit: "%"
    label: Stirring DC
    description: Duty cycle for stirring
    type: numeric
    default: null
    display: true
  1. Refresh the Pioreactors page:


For the bubbler, the only way currently is by changing the config.ini duty_cycle under [air_bubbler] and restarting the job. However, we can make this editable, like stirring’s above. Would you like that?