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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 77

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 solves the problem of position trailing along a given curve by moving its Stop Loss and Take Profit.

This is a standard StdDev indicator with an additional feature, which changes the line color depending on its values. When the value increases, the line color is painted in green; when it falls, the line becomes red; if values stay the same over several periods, the line color stays yellow.

A Keltner Channel drawn relative to the average value of the MFI oscillator as a sequence of candlesticks

The trading system is based on direction changes of the wighted oscillator WeightOscillator

An example of receiving the High and Low prices of bars over the past 24 hours.

Trading system using the IBS_RSI_CCI_v4 indicator

The library allows to automatically assign 'magic' to an Expert Advisor on any symbol and any timeframe. It allows having up to 65535 magic numbers in one Expert Advisor.

The IBS_RSI_CCI_v4 indicator with the timeframe selection option available in the input parameters

The ZigZag indicator plotted using the NRTR_extr algorithm.

The ZigZag indicator plotted using the NRTR algorithm.

The strategy uses two indicators Moving Average, MA with different periods, Commodity Channel Index, CCI and Williams’ Percent Range, %R.

The trading strategy uses two MA indicators, one ATR and one CCI.

The Ichimoku indicator with an alert.

The strategy is based on two indicators: ADX and MA, and the close of the first bar. Also, different TakeProfit, StopLoss and Trailing levels are used for Buy and Sell.

An assessment is made based on the values of five indicators (Gator, WPR, AC, DeMarker and RSI). Uses trapezoidal membership functions. Before sending a trade request, it checks if funds on the account are enough.

The indicator shows the statistical characteristics of bars: the mean value, variance, skewness and kurtosis

The Expert Advisor idea is based on the constant change of trade direction depending on the TakeProfit, StopLoss and TrailingStop levels.

The "MQL5 Wizard MA RSI" Expert Advisor has been generated using the MQL5 Wizard based on the signals of the trend MA (Moving Average) indicator and of the RSI (Relative Strength Index) oscillator.

The Expert Advisor is based on the following indicators: RSI, WPR, Stochastic, Moving Average, deMarker

The TriX indicator in a candlestick form with the Keltner channel calculated relative to TriX averaging.

Modification of StopLoss of any positions. Trailing. Trailing.

Opens a SELL position on each bar, if Close of the 1st bar > Close of the 3rd bar. Opens a BUY position on each bar, if Close of the 3rd bar > Close of the 1st bar.

10 pips per day opposite to the "yesterday's trend".

A library of averaging algorithms, the algorithms were described in details in the article "Averaging Price Series for Intermediate Calculations Without Using Additional Buffers"

A simple trend indicator of the oscillator type.

Libraries for the interaction of МТ4/5 with R

The Expert Advisor trades by two iMA (Moving Average, MA) indicators. Trailing Stop. TrailingStop

The Expert Advisor uses the following indicators: Ichimoku, MA, SAR. Optimized for currency pairs: GBPUSD and EURUSD with the M30 timeframe. The full description is available in the code.

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

The RSI indicator in a candlestick form with the Keltner channel calculated relative to RSI averaging.

The Exp_TDI-2_ReOpen trading system based on the intersection of TDI-2 indicator lines, with adding to trend-following positions.

Semaphore signal indicator based on the price action strategy looking for the strongest intraday trend, which can notify about trend change by generating an alert, sending an email or a push notification to a mobile device.

The class allows to easily determine from your MQL5 programs any changes in the Market Watch window (change of symbol sorting, adding, deleting a symbol or a set of symbols), as well as opening and closure of charts, and the availability of the one click trading option on the current chart, on which the program is running.

SilverTrend v3 - trading based on the analysis of the High, Low and Close prices of bars.

The New Martin Expert Advisor opens two opposite positions upon start. OnTradeTransaction handling. When Take Profit triggers, it opens a position (one position) in the same direction. The intersection of two MA indicators is a signal to open a position of a larger lot.

The TDI-2 indicator with the timeframe selection option available in input parameters.

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

The simplest EA based on the Fractal_WeightOscillator weighted oscillator.

The MARE5.1 Expert Advisor is very easy to use. It uses the values of two Moving Averages (SMA) at the close of 0th, 2nd and 5th bar. The EA is configured to work on the M1 timeframe.

A histogram of minimum and maximum values of the following parameters: SYMBOL_SESSION_BUY_ORDERS_VOLUME - "Total current volume of buy orders" and SYMBOL_SESSION_SELL_ORDERS_VOLUME - "Total current volume of sell orders".