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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 13

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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Keltner Channel built relative to the average value of the XRSX oscillator as a sequence of candlesticks

The Expert Advisor opens a deal in the breakout direction. Lot calculation depending on risk percent of margin.

An ExpertAdvisor based on the T3MA-ALARM indicator.

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

A simple oscillator that uses the difference between candlestick open and close prices.

Keltner Channel built relative to the average value of the OsMACandle oscillator as a sequence of candlesticks

An example of using HistorySelectByPosition (based on the HistoryDealGetTicket use example).

Support\resistance levels, trend direction — bullish\bearish.

Keltner Channel built relative to the average value of the MomentumCandle oscillator as a sequence of candlesticks

The indicator plots price channel and Fibonacci levels based on the latest NRTR_extr_ZigZag peaks

The indicator plots price channel and Fibonacci levels based on the latest NRTR_ZigZag peaks

The Expert Advisor increases the lot size after each of profitable deal, if it was preceded by losing trades. Martingale.

Short-term trends. Two iMA indicators, one iStochastic.

An implementation of Pivot Point indicator for MetaTrader 5.

Precision trend (histo).

The newest version of the Precision Trend Indicator.

Detrended Synthetic Price in oscillator form.

Detrended Synthetic Price (bars).

Detrended Synthetic Price with histogram.

How many buffers does your indicator use? What's it calculating? Is it efficient? If you want to know what's going on behind the scenes, you'll now be able to.

DSL - DMI oscillator

ADXm (vertical/horizontal filter adaptive).

Example of Buy Limit & Sell Limit pending orders with Bollinger Bands.

Converts .set files from MT5 format to MT4 format.

Vidya zone using 3 prices for calculation.

A Keltner Channel drawn relative to the average value of the Larry Williams' Percent Range oscillator as a sequence of candlesticks

The NRTR_extr_ZigZag indicator with price labels of the ZigZag peak values.

The NRTR_ZigZag indicator with price labels of the ZigZag peak values.

OnTradeTransaction

Analysis of OHLC on 0, 1, 2 and 3 bars.

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

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

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

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.

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