The indicator determines the trend/flat state in the market by the Bollinger bands.

Bollinger bands diverge with strong market movements and converge in a calm market. This property uses an indicator. When the market is calm and the distance between the Bollinger bands is less than a certain value, the indicator shows a flat (gray histogram by default). When the market moves and the Bollinger Bands diverge more than this value, the indicator determines the direction of movement and shows an upward trend (green histogram) or a downward trend (red histogram).

In order to make the indicator independent of the timeframe, the indicator does not use the absolute distance between the bands, but the relative parameter “Flat factor”.

You can use trend change signals in your Expert Advisors. Here is an example of calling the indicator from the Expert Advisor.

• BB Period – the period of Bollinger bands.
• BB Deviation – divergence of Bollinger bands.
• Flat factor is a parameter that determines the size of the flat. The larger the parameter, the larger the flat zone shown by the indicator.
• Allow signal on the 0th (unclosed) bar – allow signal on the current (unclosed) bar (true/false)
• Arrows of signals in main window – displaying trend change arrows in the main chart window
• Arrow size – the size of the arrows
• Color of UP-trend signal – color of up trend arrows
• Color of DOWN-trend signal – color of the down trend arrows

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Notification and Sound Settings block:

• ON/OFF – Sound when the signal – on/off the sound signal when starting to move up or down
• File name of sound (signal is already generated on a closed bar) – the name of the audio file for the signal
• ON/OFF – Alert – on/off. messages in the terminal when signals occur
• ON/OFF – Mail – enable/disable sending messages to email.
• ON/OFF – Push – enable/disable sending push messages to mobile devices.

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