request for small indicator development

I'm looking for a simple indicator which can calculate difference of high and low of any TWO EMAS FOR EACH CANDLE . And if difference is some number like 5 or some other number (may be customizable) then I want to place a signal any arrow up or down or may be audio signal or email etc.

If possible please develop and help me out.

thanks in advance

Why reinvent the wheel.
You can use a MACD which is the difference between 2 emas, and place 2 levels on it like for EURUSD 0.0005 and -0.0005, for USDJPY 0.05 and -0.05.

Thank you very much for your reply.
Can you give me little more idea please.