Case study
Firmware Lab Notes
Loose experiments around DHT, ultrasonic, LED/buzzer control — documented as I learn.
Status: experiment
FirmwareDHT11HC-SR04
Problem
Hardware learning is scattered unless you keep a public trail.
Idea
Treat the live site as a lab notebook for firmware + bridge work.
Hardware
ESP32, DHT11 (GPIO4), HC-SR04 (Trig18/Echo19), LEDs, buzzer.
Software
ESP-IDF sketches, serial bridge, site sensor store.
Architecture
Firmware logs → serial bridge → JSON API → dashboard widgets.