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• Moved flow check to GPIO-3 (RX). 
• Installed board in original Watkins Case
• Revised Firmware

Problems

• Having the flow check on GPIO-0 can cause reboot failures if the flow is stuck closed.Moving flow check to RX. Revised in 2020.

2023:

• Went to add the pump button and discovered a design error. The pump ADC input is floating and should have a pull-down to ground. The 3V shouldn't have the 10K resistor either.

New Control Panel

Image Added

Since I have a custom controller, I decided to add a control panel to the hot tub. The plate was 3D printed with light grey PLA filament. It was then sanded smooth. The center switch controls the lights and the small switch to the left controls the pump. All other controls are set using HomeKit.

Software

Arduino Web User Interface

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