Originally Markos Katsanos' indicator that LazyBear made popular here on TW. Now updated to Pine Script version 5, which makes multi-timeframe charting easier.
The initial Katsanos' idea for the indicator is the following:
"The VFI is based on the popular On Balance Volume (OBV) but with three very important modifications:
Unlike the OBV, indicator values are no longer meaningless. Positive readings are bullish and negative bearish. The calculation is based on the day’s median instead of the closing price. A volatility threshold takes into account minimal price changes and another threshold eliminates excessive volume. ... A simplified interpretation of the VFI is that values above zero indicate a bullish state and the crossing of the zero line is the trigger or buy signal. The strongest signal with all money flow indicators is of course divergence.
The classic form of divergence is when the indicator refuses to follow the price action and makes lower highs while price makes higher highs (negative divergence). If price reaches a new low but the indicator fails to do so, then price probably traveled lower than it should have. In this instance, you have positive divergence."
I set up default settings for intraday trading I personally have found the most useful. And what I have found useful is how and which volume flows in and out on 1 min chart. For 1 min volume flow I find it convenient to have specific EMAs as guidance: 360, 720, 1440, 2160, 2880, 3600, 4320 -- the logic is derived from how many minutes there are per specific hours and days. Since short term trends typically last for three days, 1440 and 4320 EMAs are the ones I myself concentrate the most. That is to say, quite often 1min volume flow pivots around 1440 and 4320 EMAs.
If you want to see 1 min volume flow on some other timeframe than 1 min, change the timeframe in the settings.
Notice that the volume flow length is set up for 'daily' 1 min chart as well, thus the default length is 1440. When this volume flow (length of 1440 on 1 min chart) is both above the zero line and 1440 exponential moving average, I consider that the current intraday trend is bullish; and vice versa, when the volume flow is both below the zero line and 1440 exponential moving average, the current intraday trend is bearish. Moreover, longer term trend changes require the volume flow crossing the 1440 ema, and the 1440 ema crossing the zero line. That is, in line with Katsanos' original idea both the zero line and 1440 ema work as specific pivot areas for the 1 min volume flow.