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bgant committed Feb 29, 2024
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## Project Goal
Due to heavy smoke from wildfires in 2023, I wanted a way to automatically turn off the ERV (to avoid pulling smoke into the house) if the [EPA Air Quality Index](https://www.airnow.gov/national-maps/) [API](https://docs.airnowapi.org/webservices) value was too high. I contacted the ERV vendor and they recommended sending a 12V DC (high) signal to the OVR wire on the ERV. This would "override" the wall control and run the ERV at Maximum speed to clear the smoke out of the house...?!? :thinking:

I realized this would be a fun project to learn how to view unknown digital signals. Even if I didn't know what the wall control was saying to the ERV, I should be able to isolate which bytes correspond with which button presses, and try sending those same bytes using Python. My end goal is a [MicroPython](https://micropython.org/) device that automatically shuts off the ERV when the outside air is not optimal.
I realized this would be a fun project to learn how to view unknown digital signals. Even if I didn't know what the wall control was saying to the ERV, I should be able to isolate which bytes correspond with which button presses, and try sending those same bytes using Python. My end goal is a [MicroPython](https://micropython.org/) device that automatically shuts off the ERV when the outside air is not optimal. The [micropython](micropython) folder in this repository contains my work for that project.

## Hardware
I installed a [B180E75RT](https://www.sylvane.com/broan-b180e75rt-ai-series-180-cfm-energy-recovery-ventilator.html) ERV with a [VTTOUCHW](https://www.sylvane.com/broan-vautow-automatic-wall-control-ai-series.html) Touchscreen Wall Control. I then purchased a [VAUTOW](https://www.sylvane.com/broan-vautow-automatic-wall-control-ai-series.html) Automatic Wall Control to compare wall control signals.
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