📦 Open Source

ESP32S3 SMS Alerts: No GSM, Just Wi-Fi Smarts

Basement door cracks open. Your phone buzzes instantly—no SIM, no bulk. ESP32S3 makes smart alerts stupidly simple.

theAIcatchup Apr 09, 2026 4 min read
Seeed Studio XIAO ESP32S3 wired to HC-SR04 ultrasonic sensor for motion-triggered SMS alerts

⚡ Key Takeaways

  • Ditch GSM: Wi-Fi + cloud API sends SMS worldwide, free tier. 𝕏
  • 15-min build with XIAO ESP32S3 ultrasonic sensor—no bloat. 𝕏
  • Swappable sensors expand to tanks, doors, farms; anti-spam logic built-in. 𝕏
Published by

theAIcatchup

Ship faster. Build smarter.

#ESP32 Motion Sensor #ESP32 security #HC-SR04 sensor #IoT projects #SMS Alert System #SMS alerts #XIAO ESP32 S3 #XIAO ESP32S3 #motion sensor SMS

Worth sharing?

Get the best Developer Tools stories of the week in your inbox — no noise, no spam.

Originally reported by dev.to

Related Stories

📬

Stay in the loop

The week's most important stories from theAIcatchup, delivered once a week.

No spam. Unsubscribe any time.