The Squelch Indicator was created by John Ehlers (Stocks & Commodities V. 18:9 (42-46)) and this indicator is a variation of his Market Mode Indicator and its purpose is the same as in it determines if the market is trending or in a choppy market. If this indicator is at the 1 level then this means the market is trending and if it is at 0 then the market is choppy. I would recommend to adjust the squelch variable to find a setting that works well for you. If you want to avoid more choppy markets then adjust the squelch variable to a lower amount and vice versa. I have included basic buy and sell signals so buy when the line turns green and sell when it turns red.
Let me know if there are any other indicators you would like to see me publish!