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Not much to see here right now. The above is the state of the hardware as of the initial commit. Lower left is an NCD.io single relay board with a Particle Photon on it. That board isn't needed but is simply a development shield. There's a separate two relay board connected but likely to be removed as it's not needed. There's an SHT31 board also from NCD.io and connected via the I2C bus. On the end of the bus is the 4x20 LCD, which is also I2C. That's a "sundowner" from Amazon or eBay. Pretty generic device.

Two of the four buttons (yellow and blue) are connected with pullup resistors to input pins on the Photon (the shield uses a more complicated IO extender that I don't need, so it's connected to header holes beside the photon and not the shield. The two wires connected to the top screw terminals on the shield aren't used.

The PWM pin of the fan is connected to an input directly on the Photon as well. The power for the fan comes from the power supply in the upper right. It's a +5 and +24V power supply because my fans are 24V PWM controlled Delta fans. 12V fans are hard to find right now, especially that move a lot of CFM. These are 1.05A fans at 24V and I'll ultimately use two in my project.

I do not use the RPM feedback line from the fan. Don't think it's necessary.