An expert adviser based on MQL5

Requirements Specification 

Here is an example of Requirements Specification for the development of the MACD Sample Expert Advisor, which is available in the MetaTrader 5 standard package.

1. The idea of the trading system is as follows: market entries are performed when MACD's main and signal lines intersect in the current trend direction.

2. Trend is determined based on the Exponential Moving Average with the specified period (InpMATrendPeriod). If the current EMA value is greater than the previous one, the trend is seen as growing (ema_current > ema_previous). Alternatively, if current EMA is below the previous one, the trend is considered to be falling (ema_current< ema_previous).

3. Trading Signals:

• Buy signal: the main MACD line crosses the signal line upwards (macd_current>signal_current && macd_previous<signal_previous).
  
• Sell signal: the main MACD line crosses the signal line downwards (macd_current<signal_current && macd_previous>signal_previous). The below figure shows Buy and Sell cases.