google app script RSI email alert

rsiscript.js

function checkRSIAndAlert() {
  const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Sheet1");  // Change to your sheet name
  
  // RSI cell - e.g., if your RSI is in J25 (adjust!)
  const rsiCell = sheet.getRange("J25");  
  const currentRSI = rsiCell.getValue();
  
  // Your thresholds
  const overbought = 70;
  const oversold   = 30;
  
  // Track previous RSI value (stored in a hidden cell or PropertiesService)
  const properties = PropertiesService.getScriptProperties();
  const prevRSIKey = "previousRSI";
  let previousRSI = parseFloat(properties.getProperty(prevRSIKey)) || null;
  
  // Only alert on a CROSS (not just if it's already there)
  let message = "";
  
  if (previousRSI !== null) {
    if (currentRSI > overbought && previousRSI <= overbought) {
      message = `RSI crossed OVERBOUGHT: ${currentRSI.toFixed(2)} (was ${previousRSI.toFixed(2)}) for ${sheet.getRange("A1").getValue() || "your ticker"}`;
    } else if (currentRSI < oversold && previousRSI >= oversold) {
      message = `RSI crossed OVERSOLD: ${currentRSI.toFixed(2)} (was ${previousRSI.toFixed(2)}) for ${sheet.getRange("A1").getValue() || "your ticker"}`;
    }
  }
  
  // Update stored previous value
  properties.setProperty(prevRSIKey, currentRSI.toString());
  
  // Send email if crossed
  if (message) {
    const email = "your.email@example.com";  // Change this!
    const subject = "RSI Alert: " + message;
    MailApp.sendEmail(email, subject, message + "\n\nCheck sheet: " + SpreadsheetApp.getActiveSpreadsheet().getUrl());
  }
}