Temperature Module Fan Speed Control

[rkahnamouei]

Overview

I would like to request a control parameter for the fan speed on the temperature module, as the main concern is the noise level.

In other temperature modules, such as the one from Qinstruments, the fan speed automatically reduces to a quieter state after reaching the set temperature. This makes sense because, once the set point is achieved, the Peltier element no longer requires a high airflow, and the temperature can be maintained with reduced airflow.

In the Opentrons Temperature Module, this automatic fan speed reduction only occurs for temperatures above 30°C. For example, if I lower the temperature from 60°C to 40°C, the fan initially accelerates to its maximum speed. Once the target of 40°C is reached, the fan speed decreases. However, for temperatures below 30°C, the fan continues to run at its maximum speed, creating a high level of noise. This noise is not only bothersome but also increases the risk of airborne contamination due to the high airflow.

We have both temperature modules from your company and Qinstruments. While Qinstruments' module reduces fan speed more effectively, its end-to-end airflow path causes some issues for our usage. In contrast, we prefer the design of the Opentrons module, where the air inlet and outlet are on the same side.

However, we would greatly appreciate the ability to control or automatically reduce the fan speed at lower temperatures to address the noise and contamination concerns.

Implementation details

No response

Design

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Acceptance criteria

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