Simple visualisation of Average True Range in Pinescript V4.
The script has two modes: Running and Trailing.
In Running mode, it continuously displays the ATR above and below the price. Specifically, it displays the High and Low price plus and minus the ATR times a user-supplied multiplier. This can be helpful for visualising volatility.
In Trailing mode, it displays the same ATR line, except the line trails until price crosses it. When price crosses it, it flips from long to short or vice-versa.
You could use trailing ATR as a stop loss. Adjust the multiplier and lookback period for your asset and preference.