Understanding the EA's Functionality
Purpose:
The EA is designed to automatically close existing trades based on Heiken Ashi signals. It scans multiple currency pairs for potential closing opportunities.

Core Logic:

Symbol Selection: The EA operates on a user-defined list of symbols (comma-separated).
Timeframe: The EA operates on a user-defined timeframe.
Scan Interval: The EA scans for open positions at a user-defined interval (in seconds).
Heiken Ashi Calculation: The EA calculates an approximation of the Heiken Ashi value using the current Open price and the previous Heiken Ashi close. This approximation is used for trade decision-making.
Trade Closure:
If a position is open on a monitored symbol, the EA checks the current Heiken Ashi signal (bullish or bearish).
If the Heiken Ashi signal indicates a potential reversal, the EA closes the position.
Limitations:

The EA uses an approximation of the Heiken Ashi value, which might lead to increased trade activity and potential false signals.
The EA does not have built-in error handling or optimization features.
Code Structure
The code includes:

Input parameters: Defines user-configurable settings for symbols, timeframe, and scan interval.
Heiken Ashi calculation functions: IsBullishHeikenAshiApprox and IsBearishHeikenAshiApprox calculate approximate Heiken Ashi values.
OnTick function: The main logic for scanning open positions, checking Heiken Ashi signals, and closing trades.
Developer Notes
The EA can be improved by implementing a more accurate Heiken Ashi calculation using historical data.
Consider adding error handling mechanisms to gracefully handle unexpected situations.
Implement a confirmation mechanism to re-evaluate the Heiken Ashi signal after the candle closes to reduce false signals.
Explore additional features like position filtering, trade management, and optimization.