A notch filter to detect a smoke alarm

Here’s another class project from this past spring semester, this time from Introduction to Circuit Analysis class. Background: There are already devices that detect a smoke detector beeping and do something with it. These range from inexpensive (Life+Gear Fire Safety Night Light, $8) to capitalize-on-the-disabled expensive (SafeAwake Fire Alarm Aid with Bed Shaker, $250), and all rely on a similar …

Adding WiFi to an alarm clock for the hearing impaired

Introduction: The ClearSounds SW200 (motto: “shakeup to wakeup”) is an $80 alarm clock designed for those of us with hearing loss. It has hearing impairment-friendly features such as the ability to flash lights, an adjustable-frequency tone, and a bed shaker. I’ve found the bed shaker is really effective – even when I had perfect hearing, the loudest screeching alarm sometimes …

ESP8266 Arduino SMTP Server part 2

This is a continuation of the first miserable attempt at having an ESP8266 receive a signal from a DVR. Click here for part 1. This is continued in part 3. Goal: Have a CK-PA9604 H.264 CCTV DVR send a signal on motion detected, to an arduino-programmed ESP8266 Wifi SMTP server, to sound a chime in a separate location. Background: This …