I’m working on a Pine Script indicator in TradingView that needs to trigger alerts based on the close of 15-minute bars, even though my chart is set to a 30-minute timeframe. I’m encountering issues with the alert configuration. i set an alert for once-per-bar but it triggers as soon as i create the alert. Here is the relevant part of my Pine Script code:

// Define the timeframe to monitor (15-minute in this case)
timeframe_to_check = "15"

// Get the close price from the 15-minute timeframe
close_15m = request.security(syminfo.tickerid, timeframe_to_check, close)

// Reset stop_triggered at the start of a new 15-minute bar
var bool stop_triggered = false

if (close_15m < sl_price) and open_position
    stop_triggered := true
else
    stop_triggered := false

// Alert condition for stop-loss hit
alert_if_price_hit_stop = stop_triggered and open_position

alertcondition(alert_if_price_hit_stop, title="Stop Loss Hit", message="The stop loss level has been hit in {{ticker}}")

I tried setting up the alert in TradingView with the “Once per bar close” option, but it triggers based on the 30-minute bar close, not the 15-minute bar close as intended. I also considered using “Once per minute,” but I’m not sure if this is the correct approach to ensure accurate 15-minute bar close detection while avoiding unnecessary alerts.

I expected the alert to trigger based on the close of the 15-minute bars, even though my chart is set to a 30-minute timeframe. The goal is to accurately detect and respond to the 15-minute bar closes within the higher timeframe chart.