myfirstrobot/Myfirstrobot.mq5

//+------------------------------------------------------------------+
//| myfirstrobot.mq5 |
//| Strategy: RSI 30/70 EURUSD M15 - Fixed Lot 0.01 |
//+------------------------------------------------------------------+
#property strict

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

input int RSI_Period = 14;
input int RSI_Oversold = 30;
input int RSI_Overbought = 70;
input double LotSize = 0.01;
input int StopLossPoints = 100;
input int TakeProfitPoints = 200;
input long MagicNumber = 123456;

int rsi_handle;

//+------------------------------------------------------------------+
int OnInit()
{
   rsi_handle = iRSI(_Symbol, PERIOD_M15, RSI_Period, PRICE_CLOSE);
   if(rsi_handle==INVALID_HANDLE) return(INIT_FAILED);
   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   if(rsi_handle!=INVALID_HANDLE) IndicatorRelease(rsi_handle);
}
//+------------------------------------------------------------------+
bool HasOpenPosition()
{
   for(int i=0; i<PositionsTotal(); i++)
   {
      if(PositionGetSymbol(i)!="")
        if(PositionGetInteger(POSITION_MAGIC)==MagicNumber)
          return true;
   }
   return false;
}
//+------------------------------------------------------------------+
void OnTick()
{
   if(HasOpenPosition()) return;

   double rsi_buffer[];
   if(CopyBuffer(rsi_handle,0,0,2,rsi_buffer)<=0) return;
   double rsi_now = rsi_buffer[0];

   double price = SymbolInfoDouble(_Symbol, SYMBOL_ASK);
   double sl=0, tp=0;

   if(rsi_now < RSI_Oversold)
   {
      // BUY
      if(StopLossPoints>0) sl = price - StopLossPoints*_Point;
      if(TakeProfitPoints>0) tp = price + TakeProfitPoints*_Point;
      trade.SetExpertMagicNumber(MagicNumber);
      trade.Buy(LotSize, _Symbol, 0, sl, tp);
   }
   else if(rsi_now > RSI_Overbought)
   {
      // SELL
      price = SymbolInfoDouble(_Symbol, SYMBOL_BID);
      if(StopLossPoints>0) sl = price + StopLossPoints*_Point;
      if(TakeProfitPoints>0) tp = price - TakeProfitPoints*_Point;
      trade.SetExpertMagicNumber(MagicNumber);
      trade.Sell(LotSize, _Symbol, 0, sl, tp);
   }
}