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As part of an exterior refurbishing of the exterior of our home, we replaced a louvered ventilation area with an exhaust fan because we have a powerful air conditioner heating up the garage.
It has a switch below it, but this project makes it easier to use. In the AUTO position of this 3-way switch the fan voltage is controlled by a power relay, which is controlled by the control board of this project, which is a thermostat. A limit switch is fastened to the segmented front door as an interlock because an opening is needed to allow fresh air to enter during fan operation. |
| Here are photographs |
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Here are the circuit diagrams |
| Here is the code |