The other type of indicator is an oscillator. Oscillators are drawn in a separate window and they oscillate between high and low price extremes. They are centered around a neutral axis (generally 0), or they are bound by an upper or lower extreme (such as 0 and 100).
Examples of oscillators include momentum, stochastics and RSI. Learn in this MQL4 Oscillator Indicator EA article how to program the Expert Advisor to trade using the most popular oscillators.
Oscillators indicate overbought and oversold levels. While they can be used as an indicator of trends, they are generally used to locate areas of pending reversal. These are used to produce counter-trend signals.
Below is a number of occillators:
| MACD(1) | |
|---|---|
| Note | //Buy: MACD rises above the signal line
//Sell: MACD falls below the signal line |
| Extern | int fastmacd=12; //Averaging period for calculation of a quick MA
extern int slowmacd=26; //Averaging period for calculation of a slow MA extern int signalmacd=9; //Averaging period for calculation of a signal line |
| Indicator Calling |
macdmaincurr=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_MAIN,0); macdmainprev=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_MAIN,1); macdsigcurr=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_SIGNAL,0); macdsigprev=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_SIGNAL,1); |
| BuyCond | if (macdmainprev < <macdsignalprevious&&macdmaincurrent>macdsignalprev && macdmaincurr >= macdsignalcurr) </macdsignalprevious&&macdmaincurrent> |
| SellCond | if (macdmainprev > macdsignalprev && macdmaincurr <=macdsignalcurr) |
| MACD(2) | |
|---|---|
| Note | //Buy: crossing 0 upwards
//Sell: crossing 0 downwards |
| Extern | int fastmacd=12; //Averaging period for calculation of a quick MA
extern int slowmacd=26; //Averaging period for calculation of a slow MA extern int signalmacd=9; //Averaging period for calculation of a signal line |
| Indicator Calling |
macdmaincurr=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_MAIN,0); macdmainprev=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_MAIN,1); macdsigcurr=iMACD(NULL,0,fastmacd,slowmacd,signalmacd,0,MODE_SIGNAL,0); macdsigprev=iMACD(NULL,0,fastmacd,slowmacd,signalmacd0,MODE_SIGNAL,1); |
| BuyCond | if (macdmainprev < 0<macdsignalprevious&&macdmaincurrent> && macdmaincurr >= 0) </macdsignalprevious&&macdmaincurrent> |
| SellCond | if (macdmainprev > 0 && macdmaincurr <= 0) |
| RSI | |
|---|---|
| Note | //Buy: crossing 30 upwards
//Sell: crossing 70 downwards |
| Extern | rsiu = 14; // averaging period lowerband = 30; upperband = 70; |
| Indicator Calling |
rsicurrent=iRSI(NULL,0,rsiu,PRICE_CLOSE,0); rsiprevious=iRSI(NULL,0,rsiu,PRICE_CLOSE,1); |
| BuyCond | if (rsiprevious<lowerband&&rsicurrent>=lowerband) |
| SellCond | if (rsiprevious>upperband&&rsicurrent<=upperband) |
| Stochastics Occilator(1) | |
|---|---|
| Note | //Buy: main line rises above 20 after it fell below this point
//Sell: main line falls lower than 80 after it rose above this point |
| Extern | stok = 5; // Period(amount of bars) for the calculation of %K line stod = 3; //Averaging period for the calculation of %D line stslow =3; // Value of slowdown mamode = 1; lowerband = 20; upperband = 80; |
| Indicator Calling |
stocurrent=iStochastic(NULL,0,stok,stod,stslow,mamode,0,MODE_MAIN,0); stoprevious=iStochastic(NULL,0,stok,stod,stslow,mamode,0,MODE_MAIN,1); |
| BuyCond | if (stoprevious<lowerband&&stocurrent>=lowerband) |
| SellCond | if (stoprevious>upperband&&stocurrent<=upperband) |
| Stochastics Occilator(2) | |
|---|---|
| Note | //Buy: main line goes above the signal line //Sell: signal line goes above the main line |
| Extern | stok = 5; // Period(amount of bars) for the calculation of %K line stod = 3; //Averaging period for the calculation of %D line stslow =3; // Value of slowdown mamode = 1; lowerband = 20; upperband = 80; |
| Indicator Calling |
stomaincurr=iStochastic(NULL,0,stok,stod,stslow,mamode,0,MODE_MAIN,0); stomainprev=iStochastic(NULL,0,stok,stod,stslow,mamode,0,MODE_MAIN,1); stosignalcurr=iStochastic(NULL,0,stok,stod,stslow,mamode,0,MODE_SIGNAL,0); stosignalprev=iStochastic(NULL,0,stok,stod,stslow,mamode,0,MODE_SIGNAL,1); |
| BuyCond | if (stomainprev<stosignalprev&&stomaincurr>=stosignalcurr) |
| SellCond | if (stomainprev>stosignalprev&&stomaincurr<=stosignalcurr) |
| Williams % Range | |
|---|---|
| Note | //Buy: crossing -80 upwards
//Sell: crossing -20 downwards |
| Extern | willperiod = 14; // averaging period lowerband = -20; upperband = -80; |
| Indicator Calling |
willcurrent=iWPR(NULL,0,willperiod,0); willprevious=iWPR(NULL,0,willperiod,1); |
| BuyCond | if (willprevious<upperband>willcurrent>= upperband) |
| SellCond | if (willprevious>lowerband&&willcurrent<=lowerband) |
| Force Index | |
|---|---|
| Note | /Flag 14 is 1, when FI recommends to buy (i.e. FI<0)
//Flag 14 is -1, when FI recommends to sell (i.e. FI>0) |
| Extern | forceu = 2; // averaging period |
| Indicator Calling |
forcecurrent=iForce(NULL,0,forceu,MODE_SMA,PRICE_CLOSE,0); |
| BuyCond | if (forcecurrent<0) |
| SellCond | if (forcecurrent>0) |
