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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 140

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 indicator allows defining the trend direction

The semaphore signal indicator fixing moments of breakthrough of the zero level by the iCCI technical indicator and displaying these moments by color points

The indicator displays in a separate window not only volumes, but their average value on history. The average value of volumes is used for drawing the forecast of volumes value for the current and the following days

Emulator of functions for working with objects. It gives possibility to see the objects after testing in the chart

Simple trends visualizer

Donchian channel is a technical indicator developed by Richard Davoud Donchian.

The local extremums breakthrough indicator

The QQECloud is the indicator of quantitative and qualitative evaluation based on rather complex calculations of the RSI smoothed indicators.

The Expert Advisor on the breakthrough of the range defined by the signals of the Narrowest Range Signal indicator. Handling stop orders

The Expert Advisor using the TrendContinuation trend indicator.

Smoother Relative Strength Index.

The indicator which fixes Pin Bars in the chart

Smoother Commodity Chanel Index.

The Moving Average which uses quite a simple procedure on decreasing temporal lag based on the increase of the Moving Average period.

The indicator which displays the beginning and the end of the trend

The indicator for pair trading. The simplified variant of the "ind_2_linep1.mq5" indicator

The RSI indicator drawn on the basis of the smoothed price series with the added signal line.

The Renko Line Break indicator determines itself a synthesis of renko charts and three linear breakthrough

This indicator is created to determine the trend and its direction.

The indicator of the first price change derivative or simply trend speed and sign.

The indicator to define the global trend.

These scripts are designed to sell with fixed values of Stop Loss and Take Profit in points from the current price

These scripts are designed to buy with fixed values of Stop Loss and Take Profit in points from the current price

The indicator of the minimum sum of price changes which forms signals after flat movements and before potential breakthrough in this or that side

Trade functions library designed for use in the code of scripts and Expert Advisors depending on a broker

The indicator of reversal points drawn on the week candlesticks

The trend indicator with three states.

An updated version of the CBitPic class with the ability to control drawing transparency

This indicator is calculated on the basis of currency pair volatility displaying the nearest support and resistance level depending on the trend direction.

The indicator displays the number of false breakthroughs for the specified period


The indicator that calculates the volume per second (or over period) and the corresponding Moving Average.

The narrowest range indicator defines the moments when the market is in the "compressed" state that says of the future breakthrough in this or that side

Signals of entries and exits on the system "Friday effect"

The class to play music using the MIDI device

Calculation of 32 digit string MD5-hash from transmitted byte array

The Moving Average drawn on the basis of the EMA algorithm. A linear interpolation of two different period EMA is used

An interesting trend indicator drawn on the basis of the simple Moving Average

ElliottWaveMaker 3.0 is Tool for Semi-Automatic Analysis of Elliott Waves and Andrew's Pitchforks, a logical extension of version 2.0 known as AutoElliottWaveMaker. In version 3.0 minor errors are corrected, the ability to draw Andrew's Pitchforks and a few additional functions are added.

An Expert Advisor based on the difference of two moving averages.

The fractal adaptive Moving Average by John Ehlers. Version 1.1 7/17/2006