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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 35

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 EA trades using signals of the iMACD (Moving Average Convergence/Divergence, MACD) indicator. Lot is increased when the number of position grows (Martingale)

An Expert Advisor based on indicators "MA Cross 3MACross Alert WarnSig" (https://www.mql5.com/en/code/19519) and "Price Channel" (https://www.mql5.com/en/code/44)

Crossover of three iMAs (Moving Average, MA). Alert, sound notification and email notification of the first crossover. Arrows mark the crossover.

A trading strategy using the Martingale system.

The Expert Advisor uses signals of the iMA (Moving Average, MA) indicator with a delay from the bar opening time.

The Expert Advisor searches for N identical candlesticks in a row. It buys on bullish candlesticks and sells on bearish ones.

The Dtm indicator with the possibility to change the indicator timeframe from input parameters.

Two identical trading systems based on the crossover of the CMO indicator and the zero line, for long and short trades, which can be configured in different ways in one Expert Advisor.

A trading system based on the signals of the Daniella semaphore signal indicator.

Trading against the trend direction as of N hours ago.

The indicator implements a breakout system using the Fractal_Levels indicator channel.

A daily bar breakout strategy.

An Expert Advisor based on "KDJ Indicator"

KDJ Indicator Oscillator

The Expert Advisor trades based on iMA and iRSI signals. Values of iMA on four bars are compared. Indices of these bars can be optimized.

A trading strategy "three bars down, Stochastic up".

A trading system based on the Martingale technique.

A trading system based on the Vortex Oscillator signals.

This version of the Vortex indicator shows the difference between the VI+ and VI- lines as a histogram oscillating around the zero line.

The Expert Advisor is based on the signals of indicators iBands (Bollinger Bands, BB) and iRSI (Relative Strength Index, RSI).

Martingale and anti-martingale.

The channel is drawn based on fractals.

The indicator shows a text block with the values ​​of the user defined Stochastic Oscillator period for each timeframe.

Maximum lot calculated based on free margin.

A semaphore signal indicator using Average True Range.

The Expert Advisor is based on the signals of the Stopreversal indicator and is provided with the possibility to set a strict trading time interval.

A real-time indicator showing the lag of quotes inside the terminal.

The indicator sets indexes for candlesticks in the price movement direction.

The Expert Advisor is based on the iRSI (Relative Strength Index, RSI) indicator signals.

The Expert Advisor is based on the iOsMA (Moving Average of Oscillator, OsMA) indicator signals.

An Expert Advisor for two currency pairs

An oscillator in the DRAW_FILLING style, using digital filters.

The Expert Advisor tracks positions of all symbols with all magic numbers. If a position has been open for "Waiting for seconds" and its profit has reached "Take Profit" points, the EA closes the position. If the profit has not reached "Take Profit" points, the EA moves the take profit level.

A library for creating analog clocks using MetaTrader 4/5 graphical resources.

The Expert Advisor is based on Bill Williams' strategy.

A trend indicator, which receives trade signals from the XMACD histogram.

Closing positions: all, only profitable or only losing positions.

The XMA_Divergence indicator with the possibility to change the indicator timeframe from input parameters.

The indicator shows a text block with the values ​​of the user defined CCI oscillator period for each timeframe

A trend indicator displaying divergence areas on the price chart.

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