The Adaptive Commodity Channel Index V1 was created by John Ehlers (Rocket Science For Traders pgs 236-237) and this is the typical Commodity Channel formula with the introduction of adaptive lengths based on his earlier work with indicators such as the Mother of Adaptive Moving Averages. For longer term signals you would get a bullish signal when CCI is above 0 and a bearish signal when CCI falls below 0. For shorter term signals you would get a bullish signal when crosses over it's overbought level or when it crosses above it's oversold level or vice versa. I have included both signals to make it easier.
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