# Thread: Bollinger Band with SAR EA

1. ## Bollinger Band with SAR EA

Hello all,

I have an idea for an EA, but I'm not sure if it already exists. If it does, please send me the post. Otherwise this is my idea.

a. If the bollinger bands for current period widens by a large amount from the previous period (in other words the distance from top bollinger band and lower bollinger bands increase significantly)
b. If DMI+ > than DMI-, but the difference between the two has to be greater than 15
c. ADX current period is greater than ADX prior period AND ADX current period has to be greater than 10

2. Sell if:
a. If the bollinger bands for current period widens by a large amount from the previous period (in other words the distance from top bollinger band and lower bollinger bands increase significantly)
b. If DMI- > than DMI+, but the difference between the two has to be greater than 15
c. ADX current period is greater than ADX prior period AND ADX current period has to be greater than 10

2. very interesting... i'll try it.

as long as you've used it, how the accuracy of this system?

3. Tripl 7 -
I've looked at historical data for both long and short time frames and noticed that when these conditions are met, there's a high probability of making money. When these conditions are met, I've noticed the following:
1. Short time frames such as 5 min yields 25 pips or less
2. Long time frame such as 1h yields a bigger reward such as 75+ pips.
3. When the ADX is in consolidating phase (value is less than 15 for long periods of time) and starts to increase to 20+ over the next few time frames and bollinger bands widen, you'll get the highest probability of success. When ADX starts to decrease at every time frame for the last 3 time frames, the trend is weaking and the position should be closed.

I've found one EA that uses the DMI+ and DMI- crosses, but does not use the bollinger bands or adx strength. It's called the SAR ADX Expert Advisor in the Top Free EA section. Maybe it can be tweaked.