[BlowFish]

My personal favourites are

Using the bars themsleves - simply using higher highs and higher lows. Breaking previous swing high swing lows to signal a reverse or continuation of trend. Instantaneous no need for indicators once you look at enough charts you can see shifts in momentum and other nuances.

Basic trend lines - a break signifies a change in trend (might only be to sideways). I know a couple of scalpers that use nothing more than trend lines on constant tick charts. If you want to be adventurous draw a parallel to give you targets.

Floor Pivots - above the PP trend is up below down. For your time frame try using the previous hours or 30 minutes (H+L+C)/3 rather than the daily. Dosent come easier than that and is often spookily accurate in how price 'obeys' them. If price is 'too far' from the line trade the journey back to it.

Or you could use a 3rd order polynomial oscillator crossing 1.5 standard deviations from its apex. :-)

Cheers.