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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 19

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 TTM-Trend indicator with the timeframe selection option available in the input parameters.

A rounded MACD histogram presented in the price chart points.

The smoothed Commodity Channel Index oscillator with the color indication of overbought/oversold level breakouts and of the histogram direction

Smoothed Ichimoku oscillator

Crossing of the two iMAs. Lot calculation based on the risk value as a percentage of margin.

The Exp_ChandelExitSign_ReOpen trading system based on the signals of the ChandelExitSign indicator with trend following scaling.

The smoothed Money Flow Index oscillator with the color indication of overbought/oversold level breakouts and of the histogram direction.

A semaphore signal indicator. Its code does not contain averaging algorithms.

The smoothed Larry Williams' Percent Range oscillator with the color indication of overbought/oversold level breakouts and of the histogram direction.

The smoothed Relative Strength Index oscillator with the color indication of overbought/oversold level breakouts and of the histogram direction

The XССXCandleKeltner indicator with the breakout indication option

The XRSXCandleKeltner indicator with the breakout indication option

The CDir class allows getting information about files and folders outside the MQL5 sandbox similar to the MS-DOS Dir command. Call of system DLL is used, therefore you should allow their use.

Returns position profit in points based on the trading history.

An example of determining the moment when a pending order has triggered.

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

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

The price chart speed expressed in points, with the author markup of significant price change levels.

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

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

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.

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