A simple TEMA cross over and under signal - Trading Robot

The idea of the trading system is as follows: Using the Triple Exponential Moving averages as a an indicator to get in and out of a trade. Using the TEMA 55, TEMA 21 indicators, when one line crosses over the other it will trigger a buy or close event.

FOREX BASED EXPERT ONLY.

Trading Signals: - When the TEMA 55 crosses over the TEMA 21 a buy instruction must take place.

                         - When the TEMA 55 crosses under the TEMA 21 the buy instruction must be closed.

-This must repeat for every crossover and under event-

NB*: There must be an input parameter for lot size as the leverage will be 100:1. My account will be small so I will need that functionality. 

No stop-loss needed as the opposite signal will close out the position.

I don't know if this is relevant but this program needs to only run on the 5 MINUTE chart. This is important as the strat is only profitable on this timeframe.

Additional info:

Pine editor script used on Trading View: 

//@version=4

strategy("Triple EMA 55 vs Triple EMA 21", overlay=true)

// Define Triple EMA indicators

tema55 = ema(close, 55)

tema21 = ema(close, 21)

// Define buy and sell conditions

buy = crossover(tema55, tema21)

sell = crossunder(tema55, tema21)

// Buy

if (buy)

    strategy.entry("Buy", strategy.long)

// Close Buy

if (sell)

    strategy.close("Buy")

SEE ATTACHED SCREEN SHOT OF TRADINGVIEW.