Circuit Cellar 426 January 2026 (PDF)

Issue #426
January 2026
Wearable Devices

4: Build a Miniature Greenhouse for Hydroponic and Potted Plants 
Automated Monitoring with a Raspberry Pi 4B
By Evan Leong and Vidhi Srivastava

12: Build a Smart Energy Meter to Track Home Power Usage
Using an ESP32 Dev Kit and PZEM-004T Energy Sensor Module
By Maheshwaran Sadasivam

20: Designing Analog Electronics
Part 3: Filters for AC Circuits
By Andrew Levido

28: TECHNOLOGY FEATURE
The Pulse of Innovation - Introduction: The Rise of Wearable Technology
By Curtis Franklin

38: DATASHEET
Power Quality Monitoring
Watching the Peaks and Valleys Systems for Monitoring Power Quality for Homes and Industry
By Curtis Franklin

42: Picking Up Mixed Signals
IR Images Come to Your Cellphone
By Brian Millier

52: Embedded System Essentials
Hands-On Buffer Overflow Experimenting with Embedded System Vulnerabilities 
By Colin O’Flynn

63: TECH THE FUTURE
The Future of Edge AI
Ultra-Low Power Edge AI The Case for Intelligence at the Source
By Adinor Puplampu