Trading robot in MQL4 based on Open & Close and some other pretty basic factors.

1) Idea

Based on all of the most recent x (e.g. 30) number of bars, (x = input variable)

Calculate at start of each bar:

 MaxOpenClose = the maximum of ( maximum of Open, maximum of Close) of all of most recent x bars 

 MinOpenClose =  the minimum of ( minimum of Open, minimum of Close)  of all of most recent x bars

 Level_1 = ( MaxOpenClose - MinOpenClose ) *  Ratio_1            

 Level_2 =   ( MaxOpenClose - MinOpenClose ) *  Ratio_2           

LevelCounter_1 = Number of times, in the most recent x number of bars, the High was >= Level_1 

LevelCounter_2 = Number of times, in the most recent x number of bars, the Low was <= Level_2

Trading is done based on the ratio of  LevelCounter_1 and  LevelCounter_2

LevelCounter_1  and LevelCounter_2 will always be >=  0 and <= x 

Output all these values to the journal window with each bar.

"most recent" excludes the current "in progress" bar

2) Trading signals:

if   LevelCounter_1 >  LevelCounter_2 ; buy signal

if   LevelCounter_1  <=  LevelCounter_2 ; sell signal

3) Positions are opened at the market price; subject to that there are no more open positions as specified by the   MaxOpenBuyOrders  input parameter for Buys 

and  MaxOpenSellOrders  for sell orders.

A buy position is opened if   LevelCounter_1 >  LevelCounter_2 for lot size =   LotSize (  LotSize = input parameter)

A sell position is opened if   LevelCounter_1  <  LevelCounter_2  for lot size =   LotSize (  LotSize = input parameter)

If the order cannot be executed successfully for whatever reason, try again in each tick, for the next 10 ticks, to do again.

4) Additional filter for position opened

Minimum average volume of last x number of bars >= MinAvgVolumeToOpen  (input parameter)

5) Positions are closed when

a)  StopLoss (input parameter) is reached.

or b) ProfitTarget (input parameter) is reached.

6) Position management

TrailingStop is used; while the price move in the profit direction, the stop loss should trail at the StopLoss (input parameter) value.

The Stop Loss is never moved towards the loss direction. 

The robot should work on any forex pair, any time frame.

Inputs:

 x                      // Number of most recent bars to take into consideration,e.g. 10

Ratio_1            // Used in calculation

Ratio_2           // Used in calculation 

MaxOpenBuyOrders  // e.g.  5

MaxOpenSellOrders  // e.g.  5

LotSize    //  e.g.  0.01

StopLoss // e.g.  30 

ProfitTarget // e.g.  100

MinAvgVolumeToOpen // e.g.  40