Source Code MQ4 & MQ5

//+------------------------------------------------------------------+
//|                                    TREND CROSS WITH ALERT EA.mq5 |
//|                                  Copyright 2024, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2024, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"

#include <Trade/Trade.mqh>
CTrade obj_Trade;

int handleTrendCrossInd = INVALID_HANDLE;

double arrow_up[];
double arrow_down[];

//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit(){
//---
   
   handleTrendCrossInd = iCustom(_Symbol,_Period,
                        "1. Custom INDICATORS\\Trend-Cross Alert",
                        14,2,30,2.0,PRICE_CLOSE);
   
   ChartIndicatorAdd(0,0,handleTrendCrossInd);
   
   if (handleTrendCrossInd == INVALID_HANDLE){
      Print("ERROR INITIALIZING INDICATOR. REVERTING NOW!");
      return (INIT_FAILED);
   }
   else if (handleTrendCrossInd != INVALID_HANDLE){
      Print("SUCCESS ON INDICATOR INITIALIZATION.");
   }
   
   ArraySetAsSeries(arrow_up, true);
   ArraySetAsSeries(arrow_down, true);
   
//---
   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason){
//---
   
}
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick(){
//---
   
   if (CopyBuffer(handleTrendCrossInd,4,0,3,arrow_up) < 3){
      Print("ERROR GETTING REQUESTED DATA. REVERTING NOW!");
      return;
   }
   if (CopyBuffer(handleTrendCrossInd,5,0,3,arrow_down) < 3){
      Print("ERROR GETTING REQUESTED DATA. REVERTING NOW!");
      return;
   }
   
   int currbars = iBars(_Symbol,_Period);
   static int prevbars = currbars;
   if (prevbars == currbars) return;
   prevbars = currbars;
   
   //Print(arrow_up[1]);
   //Print(EMPTY_VALUE," > ",DBL_MAX);
   
   //if (arrow_up[1] != EMPTY_VALUE){
   //   Print(arrow_up[1]);
   //}
   
   const int signalbar = 1;
   
   double Ask = NormalizeDouble(SymbolInfoDouble(_Symbol,SYMBOL_ASK),_Digits);
   double Bid = NormalizeDouble(SymbolInfoDouble(_Symbol,SYMBOL_BID),_Digits);

   if (arrow_up[signalbar] != EMPTY_VALUE){
      Print("ARROW UP = ",NormalizeDouble(arrow_up[signalbar],_Digits+1));
      if (PositionsTotal()==0){
         obj_Trade.Buy(0.01,_Symbol,Ask,Bid-400*_Point,Bid+500*_Point);
      }
   }
   else if (arrow_down[signalbar] != EMPTY_VALUE){
      Print("ARROW DOWN = ",NormalizeDouble(arrow_down[signalbar],_Digits+1));
      if (PositionsTotal()==0){
         obj_Trade.Sell(0.01,_Symbol,Bid,Ask+400*_Point,Ask-500*_Point);
      }
   }

}
//+------------------------------------------------------------------+