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There is a small error in the schematic for the project article that I wrote, Build an Arduino-Controlled AM/FM/SW Radio.
The SDIO and SCLK lines each have pull-up resistors but there should be NO connection between them. There is an erroneous small wire connection on the schematic (near R2)...
I posted this to respond to a question, but it's good, so I blogged it.
In air conditioning language:
The labels you will find inside the machines are the first letter of the alleged wire color in comm use in, "The Trade".
Green (G) is the interior fan command. If 24 VAC, then fan.
Yellow is...
