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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 90


This is the largest free source code library for MetaTrader 5 platform programs. Here you can find ready-made Expert Advisors, technical indicators, scripts and libraries. Use the code library when learning MQL5 language and develop your own automated trading applications based on the provided codes.

You can freely download and test published codes, as well as launch them in MetaTrader 5. The library is also available directly from MetaTrader 5 platform and MetaEditor development environment.

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The Expert Advisor has been created using the MQL5 Wizard, on the basis of MACD (Moving Average Convergence/Divergence) signals and the Parabolic SAR trend indicator.

The iMAs on the current period.

Two iMA indicators with hard coded periods of 3 and 7, and on iRSI indicator with the period of 2.

The Expert Advisor makes trading decisions based on simple candlestick combinations. It is designed for use on the H4 period.

Two iMAs on the current period and one on PERIOD_D1.

Pending Buy Limit (BuyLimit) and Sell Limit (SellLimit) orders. Using OnTradeTransaction().

Analysis of bars, if they contain N consecutive bars of the same type.

Trading by Moving Average. Checking for sufficiency of funds.

RSI EA - trading based on overbought/oversold zones determined by the iRSI (Relative Strength Index, RSI) indicator.

An example for calculating the lot value with a fixed margin level. That is, if you specify 10%, a position with the margin equal to 10% of free margin will be opened.

The Expert Advisor places two pending orders at a certain time.

A tick Expert Advisor. It compares the price on the previous tick and the current price.

Comparing open prices of the zero and third bar.

Derived from the NRTR indicator, provided with a new visual display.

The EA works based on the analysis of Open, High and Low.

An example of an Expert Advisor with a Trailing Stop implementation.

An example of working with the trading history on Hedge accounts — reconstruction of positions.

The EA places pending stop orders BUY_STOP and SELL_STOP.

The Expert Advisor places two pending orders (BuyStop and SellStop) with the specified expiration.

The Expert Advisor uses the values of two iMA (Moving Average, MA) indicators.

Uses two iStochastic (Stochastic Oscillator) indicators and one iRSI (RSI, Relative Strength Index). Calculates the lot size based on the analysis of closed trades.

The Expert Advisor searches for the momentum: iClose(t2)-iClose(t1).

The Expert Advisor opens or closes positions at the intersection of lines.

The Expert Advisor uses Parabolic SAR and three EMAs (with the periods of 10, 25 and 50).

Four trading strategies in one Expert Advisor.

The Expert Advisor plays sound alerts when candlestick size exceeds a certain value.

Displays important symbol and account parameters.

An example for calculating the lot value in accordance with the risk per trade.

The Expert Advisor trades moving average breakouts. It uses the following indicators: two iMAs (Moving Average, MA), iRSI(Relative Strength Index, RSI) and two iEnvelopes (Envelopes).

Trades using indicators: iStochastic (Stochastic Oscillator) and iRSI (Relative Strength Index, RSI).

The creation of the Expert Advisor stems from the topic "Neural networks - where to start studying them".

The Expert Advisor uses the iBullsPower (Bulls Power) indicator.

Demonstration of 3D visualization.

The Fractal_WeightOscillator indicator with the timeframe selection option available in input parameters.

Aroon oscillator, next version.

DMA (general version).

Schaff trend cycle - adjustable smoothing.

Quantile bands - new version.

Double stochastic - RSI floating levels.

Dsl (discontinued signal line) - stochastic for MetaTrader 5.