I created a mould abatement system for a tiny space

The wall behind my bedside table is exterior-facing, and attracts black mould, particularly in an English winter. Due to the narrow space, typical condenser and chemical dehumidifiers do not fit. I attached computer cooling fans and a heating element to the grille of the air brick, connected this to a networked microcontroller and temperature/humidity sensor, programmed it to check the indoor and outdoor conditions hourly, log all the data, and adjust the fans and heater accordingly.

Given the complex thermodynamic environment, once I have gathered enough data, I may run linear regression or inference on the historical results to optimise the decisions the system makes about actuating the heater and fans based on the sensor data. For now, it is preventing mould in a more convenient and power-efficient manner than adjusting the fans and heater manually.