Create MQL5 Expert Advisor Without Coding: Beginner's Complete Guide

//+------------------------------------------------------------------+
//|  NoCodeStarterEA.mq5                                             |
//|  Teaching example — generated by Pineify AI MQL5 Generator      |
//|  Demonstrates the classic Moving-Average crossover pattern that  |
//|  most visual EA builders produce under the hood.                 |
//+------------------------------------------------------------------+
#property copyright "Pineify.app"
#property link      "https://pineify.app"
#property version   "1.00"
#property strict

//--- Input parameters (the "settings" users tweak without coding)
input int    FastPeriod  = 9;         // Fast MA period
input int    SlowPeriod  = 21;        // Slow MA period
input int    MAPeriod    = 200;       // Trend filter MA period
input double LotSize     = 0.10;      // Trade volume in lots
input int    StopLossPips  = 40;      // Stop loss in pips
input int    TakeProfitPips = 80;     // Take profit in pips
input int    MagicNumber = 202600;    // Unique EA identifier
input string TradeComment = "NoCodeEA"; // Order comment

//--- Indicator handles
int handleFast;
int handleSlow;
int handleTrend;

//--- Buffers
double fastBuf[];
double slowBuf[];
double trendBuf[];

//+------------------------------------------------------------------+
//| Expert initialisation — runs once when EA is attached            |
//+------------------------------------------------------------------+
int OnInit()
  {
   //--- Create indicator handles
   handleFast  = iMA(_Symbol, PERIOD_CURRENT, FastPeriod,  0, MODE_EMA, PRICE_CLOSE);
   handleSlow  = iMA(_Symbol, PERIOD_CURRENT, SlowPeriod,  0, MODE_EMA, PRICE_CLOSE);
   handleTrend = iMA(_Symbol, PERIOD_CURRENT, MAPeriod,    0, MODE_SMA, PRICE_CLOSE);

   if(handleFast == INVALID_HANDLE || handleSlow == INVALID_HANDLE || handleTrend == INVALID_HANDLE)
     {
      Print("ERROR: Failed to create indicator handles.");
      return INIT_FAILED;
     }

   //--- Set buffer as series (newest value at index 0)
   ArraySetAsSeries(fastBuf,  true);
   ArraySetAsSeries(slowBuf,  true);
   ArraySetAsSeries(trendBuf, true);

   Print("NoCodeStarterEA initialised on ", _Symbol,
         " | Fast=", FastPeriod, " Slow=", SlowPeriod);
   return INIT_SUCCEEDED;
  }

//+------------------------------------------------------------------+
//| Expert deinitialization — runs once when EA is removed           |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   //--- Release indicator handles to free memory
   if(handleFast  != INVALID_HANDLE) IndicatorRelease(handleFast);
   if(handleSlow  != INVALID_HANDLE) IndicatorRelease(handleSlow);
   if(handleTrend != INVALID_HANDLE) IndicatorRelease(handleTrend);
   Print("NoCodeStarterEA removed. Reason code: ", reason);
  }

//+------------------------------------------------------------------+
//| Helper — count open positions for this EA on this symbol         |
//+------------------------------------------------------------------+
int CountPositions(ENUM_POSITION_TYPE posType)
  {
   int count = 0;
   for(int i = PositionsTotal() - 1; i >= 0; i--)
     {
      ulong ticket = PositionGetTicket(i);
      if(ticket == 0) continue;
      if(PositionGetString(POSITION_SYMBOL) == _Symbol &&
         PositionGetInteger(POSITION_MAGIC)  == MagicNumber &&
         PositionGetInteger(POSITION_TYPE)   == posType)
         count++;
     }
   return count;
  }

//+------------------------------------------------------------------+
//| Helper — send a market order                                     |
//+------------------------------------------------------------------+
bool SendOrder(ENUM_ORDER_TYPE orderType, double volume)
  {
   MqlTradeRequest  request = {};
   MqlTradeResult   result  = {};

   double price  = (orderType == ORDER_TYPE_BUY)
                   ? SymbolInfoDouble(_Symbol, SYMBOL_ASK)
                   : SymbolInfoDouble(_Symbol, SYMBOL_BID);
   double point  = SymbolInfoDouble(_Symbol, SYMBOL_POINT);
   int    digits = (int)SymbolInfoInteger(_Symbol, SYMBOL_DIGITS);
   double slDist = StopLossPips  * 10 * point;
   double tpDist = TakeProfitPips * 10 * point;

   request.action    = TRADE_ACTION_DEAL;
   request.symbol    = _Symbol;
   request.volume    = volume;
   request.type      = orderType;
   request.price     = NormalizeDouble(price, digits);
   request.deviation = 5;
   request.magic     = MagicNumber;
   request.comment   = TradeComment;

   if(orderType == ORDER_TYPE_BUY)
     {
      request.sl = NormalizeDouble(price - slDist, digits);
      request.tp = NormalizeDouble(price + tpDist, digits);
     }
   else
     {
      request.sl = NormalizeDouble(price + slDist, digits);
      request.tp = NormalizeDouble(price - tpDist, digits);
     }

   bool sent = OrderSend(request, result);
   if(!sent || result.retcode != TRADE_RETCODE_DONE)
      Print("OrderSend failed. Retcode=", result.retcode, " Comment=", result.comment);
   return sent;
  }

//+------------------------------------------------------------------+
//| Main tick function — EA logic runs here on every price tick      |
//+------------------------------------------------------------------+
void OnTick()
  {
   //--- Only act on a newly closed bar (once per bar logic)
   static datetime lastBarTime = 0;
   datetime currentBarTime = iTime(_Symbol, PERIOD_CURRENT, 0);
   if(currentBarTime == lastBarTime) return;
   lastBarTime = currentBarTime;

   //--- Copy latest two values from each indicator buffer
   if(CopyBuffer(handleFast,  0, 0, 3, fastBuf)  < 3) return;
   if(CopyBuffer(handleSlow,  0, 0, 3, slowBuf)  < 3) return;
   if(CopyBuffer(handleTrend, 0, 0, 3, trendBuf) < 3) return;

   //--- Current and previous bar values
   double fastNow  = fastBuf[1];
   double fastPrev = fastBuf[2];
   double slowNow  = slowBuf[1];
   double slowPrev = slowBuf[2];
   double trendNow = trendBuf[1];
   double askPrice = SymbolInfoDouble(_Symbol, SYMBOL_ASK);
   double bidPrice = SymbolInfoDouble(_Symbol, SYMBOL_BID);

   //--- Bullish crossover: fast crosses above slow while price above trend MA
   bool bullCross = (fastPrev <= slowPrev) && (fastNow > slowNow) && (askPrice > trendNow);

   //--- Bearish crossover: fast crosses below slow while price below trend MA
   bool bearCross = (fastPrev >= slowPrev) && (fastNow < slowNow) && (bidPrice < trendNow);

   //--- Enter long if no existing buy
   if(bullCross && CountPositions(POSITION_TYPE_BUY) == 0)
     {
      Print("BUY signal: Fast=", fastNow, " Slow=", slowNow, " Trend=", trendNow);
      SendOrder(ORDER_TYPE_BUY, LotSize);
     }

   //--- Enter short if no existing sell
   if(bearCross && CountPositions(POSITION_TYPE_SELL) == 0)
     {
      Print("SELL signal: Fast=", fastNow, " Slow=", slowNow, " Trend=", trendNow);
      SendOrder(ORDER_TYPE_SELL, LotSize);
     }
  }
//+------------------------------------------------------------------+