Sounds like a solid idea. I’ve built a few projects like that before – usually a cheap MCU like an ESP32, a DS18B20 or LM35 for temperature, and then a small server that listens for a webhook. You can push the data over MQTT or even HTTP POST to a Python listener that fires off an email or Slack message when the threshold’s crossed. Let me know what platform you’re using and I can sketch out the code for you.

I’d just use the built‑in w1‑therm kernel support and a tiny Python script. Enable the 1‑wire interface in raspi‑config, then in Python use the w1thermsensor package to read the DS18B20. For the POST just import requests and send a JSON payload. Something like: ```python from w1thermsensor import W1ThermSensor import requests, time sensor = W1ThermSensor() threshold = 30.0 # degrees C url = 'https://your‑server/alert' while True: temp = sensor.get_temperature() if temp > threshold: payload = {'temp': temp, 'time': time.time()} try: requests.post(url, json=payload, timeout=5) except requests.RequestException: pass # maybe log the failure time.sleep(60) ``` That’s it—no heavy frameworks needed, just the two libs. If you want more resilience you can add a small retry loop or log to a file. Let me know if you need the server side too.

Sure thing. Here’s a minimal Flask route that pulls the temp, logs it, and sends an email with smtplib. If the send fails it retries a couple of times. Adjust the host/port/password for your SMTP server. ```python from flask import Flask, request, jsonify import smtplib from email.message import EmailMessage import time app = Flask(__name__) SMTP_HOST = 'smtp.example.com' SMTP_PORT = 587 SMTP_USER = 'user@example.com' SMTP_PASS = 'secret' ALERT_TO = 'alert-recipient@example.com' def send_mail(subject, body): msg = EmailMessage() msg['From'] = SMTP_USER msg['To'] = ALERT_TO msg['Subject'] = subject msg.set_content(body) for attempt in range(3): try: with smtplib.SMTP(SMTP_HOST, SMTP_PORT) as s: s.starttls() s.login(SMTP_USER, SMTP_PASS) s.send_message(msg) return True except Exception as e: if attempt < 2: time.sleep(5) # small back‑off else: print('Failed to send email:', e) return False @app.route('/alert', methods=['POST']) def alert(): data = request.get_json() temp = data.get('temp') ts = data.get('time') subject = f'Temperature alert: {temp:.1f}°C' body = f'Alert triggered at {time.ctime(ts)} with reading {temp:.1f}°C.' send_mail(subject, body) return jsonify({'status': 'sent'}), 200 if __name__ == '__main__': app.run(host='0.0.0.0', port=5000) ``` That should get you up and running. Let me know if you hit any snags.

Add a standard Python logger and wrap the JSON parsing in a try/except. Something like: ```python import logging logging.basicConfig(filename='alert.log', level=logging.INFO, format='%(asctime)s %(levelname)s: %(message)s') @app.route('/alert', methods=['POST']) def alert(): try: data = request.get_json(force=True) except Exception as e: logging.warning('Malformed payload received') return jsonify({'error': 'invalid json'}), 400 temp = data.get('temp') ts = data.get('time') if temp is None or ts is None: logging.warning('Missing fields in payload') return jsonify({'error': 'missing data'}), 400 # …send mail, log success logging.info(f'Alert processed: {temp}°C at {ts}') return jsonify({'status': 'sent'}), 200 ``` That keeps the server tidy and gives you a history of every hit. Let me know if you need more tweaks.