[Don] wanted to bring his alarm system into the modern age ... Once the Arduino detects a signal, it uses an ESP8266 WiFi module to send an email. The address [Don] used is the email-to-SMS ...

The ESP8266 WiFi module is the latest, made interesting because it pretty much doesn’t exist outside China. Why is it cool? It’s a WiFi module with an SOC, making it somewhat similar to TI ...