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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 127

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.


Using Perceptron, Automatic Learning

The indicator shows the position of the current price in a channel.

The indicator plots a price channel using the Hodrick-Prescott Filter.

Smoothed Accelerator

It plots the bar-averaged price charts (median price).

The script calculates the number of lots to trade using the specified percentage of risk funds.

The Improved version of MаrtGreg Expert Advisor.

The indicator allows to perform any arithmetic action with prices of two symbols and plot result on any other chart. It allows to calculate crosses (using multiplication and division), spread (subtract) or just to plot the other symbol's data on the chart.

There is a Price Channel indicator, but I don't like it, because it fills all the space between the upper and lower boundaries. This version of Price Channel looks like in MetaTrader 4.

Moving Average indicator, can be applied to any timeframe (higher or lower than the current chart's timeframe). Includes: SMA, EMA, SMMA, LWMA, AMA, DEMA, TEMA, FRAMA, and VIDYA

Stochastic indicator, can be applied to any timeframe (higher or lower than the current chart's timeframe).

RSI indicator, can be applied to any timeframe (higher or lower than the current chart's timeframe).

All we want is to think about algorithms and methods, not about syntax and values how to place orders. Here you have simple functions to manage positions in MQL5.

MACD indicator with histogram, can be applied any timeframe (higher or lower than the current chart's timeframe).

MACD indicator with MACD line, Signal line and multi-color histogram.

The MACD oscillator with zero lag.

The MQL5 keywords and aliases for autoreplace are presented.

It's an oscillator, similar to OsMA with Variable Index Dynamic Average.

This library will allow you to tranfser realtime quotes from MetaTrader 5 to external server application.

The indicator is based on the Elder's Impluse system.

This Expert Advisor is based on Bollinger Bands. It uses trend-following strategy and Bollinger Bands indicator.

It uses martingale, the number of doublings is limited.

This is MQL5 version of DinapoliTargets indicator. The ZigZag indicator is added to the chart.

This Expert Advisor allows you to save infomation about the ticks, actual or simulated in Strategy Tester.

The Relative Strength Index, applied to standard deviation of price.

This robot uses a random number generator to simulate simply tossing a coin to decide on the direction of each trade. It provides an example of a minimal expert advisor programmed in an object-oriented style. It also provides a basis for quantifying the value added by alternative methods of entry.

One-click trading.

The Dual Trix indicator with dual magnified Values in the Chart and in the Indicator window.

The Multicurrency Expert Advisor.

An Expert Advisor, based on two MACD, it uses the martingale money management system.

Dual Trix Upgrade 1.

This indicator is based on simple MACD but allows you to choose also timeframe of indicator, different from current. You can choose current timeframe of chart (then indicator shows the same values as common MACD) or any higher timeframe.

The spread_on_chart indicator shows the current values of spread, stop and freeze levels.

The API functions to Free Fuzzy Logic Library.

This is the Heiken Ashi indicator, based on the averaged Open, High, Low and Close prices, averaged using the Adaptive Moving Average.

This Expert Advisor uses the Index Moving Average indicator.

The indicator shows the rate of change of the simple moving average.

An Expert Advisor for trading during the night.

The NRTR (Nick Rypock Trailing Reverse) indicator draws the base line (support and resistance) and a target line.

Dual Trix Indicator : 2 Moving Averages.