> For the complete documentation index, see [llms.txt](https://docs.openalgo.in/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openalgo.in/trading-platform/metatrader-5/sample-expert-advisor.md).

# Sample Expert Advisor

Here is a sample EMA Crossover Based Simple Expert Advisor which places orders to OpenAlgo Connected Brokers

```cpp
//+------------------------------------------------------------------+
//|                                                      OpenAlgo.mq5|
//|                        Copyright 2024, OpenAlgo.in               |
//|                        https://www.openalgo.in                   |
//+------------------------------------------------------------------+
#property copyright "Copyright 2024, OpenAlgo.in"
#property link      "https://www.openalgo.in"
#property version   "1.00"
#property strict

#include <OpenAlgo/OpenAlgoApi.mqh>

input string ApiUrl = "http://127.0.0.1:5000";
input string ApiKey = "your_app_apikey";
input string Strategy = "Metatrader 5 Strategy";
input string Symbol = "SAIL";
input int Quantity = 1;

// Enums as input parameters
input Exchanges Exchange = NSE; // Default value set to NSE Equity
input ProductTypes Product = MIS; // Default value set to MIS for Intraday Square off
input PriceTypes PriceType = MARKET; // Default value set to Market Order

input int FastEMAPeriod = 5;
input int SlowEMAPeriod = 10;

int handleFastEMA;
int handleSlowEMA;
datetime lastOrderTime = 0; // This will store the time of the last candle for which an order was placed


int OnInit()
{
    handleFastEMA = iMA(_Symbol, _Period, FastEMAPeriod, 0, MODE_EMA, PRICE_CLOSE);
    handleSlowEMA = iMA(_Symbol, _Period, SlowEMAPeriod, 0, MODE_EMA, PRICE_CLOSE);

    if (handleFastEMA == INVALID_HANDLE || handleSlowEMA == INVALID_HANDLE)
    {
        Print("Failed to initialize EMA handles");
        return INIT_FAILED;
    }
    
    return INIT_SUCCEEDED;
}

void OnDeinit(const int reason)
{
    if(handleFastEMA != INVALID_HANDLE) IndicatorRelease(handleFastEMA);
    if(handleSlowEMA != INVALID_HANDLE) IndicatorRelease(handleSlowEMA);
}



void OnTick()
{
    // Buffer arrays to store EMA values for the last two completed candles
    double fastEMAValues[2];
    double slowEMAValues[2];
    
    // Get the opening time of the last completed candle
    datetime currentCandleTime = iTime(_Symbol, _Period, 1);

    // Copy EMA values for the last two completed candles
    if (CopyBuffer(handleFastEMA, 0, 1, 2, fastEMAValues) <= 0 ||
        CopyBuffer(handleSlowEMA, 0, 1, 2, slowEMAValues) <= 0)
        
        
    {
        Print("Error copying EMA values");
        return;
    }

    // Determine the direction of the crossover
    bool isPositiveCrossover = fastEMAValues[0] < slowEMAValues[0] && fastEMAValues[1] > slowEMAValues[1];
    bool isNegativeCrossover = fastEMAValues[0] > slowEMAValues[0] && fastEMAValues[1] < slowEMAValues[1];
    


    // Check if an order has already been placed for the current candle
    if (currentCandleTime > lastOrderTime)
    {
        if (isPositiveCrossover)
        {
            // Correct action for a positive crossover
            PlaceOrder("BUY", Quantity, ApiUrl, ApiKey, Strategy, Symbol, Exchange, Product, PriceType);
            Print("Placing BUY order on positive EMA crossover");
            lastOrderTime = currentCandleTime; // Update the last order time
        }
        else if (isNegativeCrossover)
        {
            // Correct action for a negative crossover
            PlaceOrder("SELL", Quantity, ApiUrl, ApiKey, Strategy, Symbol, Exchange, Product, PriceType);
            Print("Placing SELL order on negative EMA crossover");
            lastOrderTime = currentCandleTime; // Update the last order time
        }
    }
}



//+------------------------------------------------------------------+

```


---

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