Reference
ESP32 DevKit V1 pinout — safe pins, strapping pins and what to avoid
Which ESP32 pins are safe to use, which are input-only, which break the boot and why ADC2 stops working the moment Wi-Fi starts. Keep this tab open.
Topic
Sensors & measurement
Reading the physical world honestly — calibration, noise, pull-ups, sample rates, and knowing when a sensor is lying to you.
Shop sensors parts3 articles
3 min readTutorial
Rain Sensing Wiper using Arduino Nano with OLED
Build a rain-sensing wiper with an Arduino Nano, a rain sensor, an SG90 servo and a 0.96in OLED — wiring table, full sketch and the failures to expect.
3 min readTutorial
Arduino Automatic Plant Watering System with a Soil Moisture Sensor
Wire a soil moisture sensor, a relay and a mini pump to an Arduino so your plants water themselves — with the calibration step most guides skip.