← Back to BlogBeginner Arduino ESP32 course — IoT from Blink to SmartNode · Part 7 / 8
ESP32 programming (7/8): WebServer — browser relay control
Built-in WebServer, /on /off routes, minimal HTML, opto-isolated relay.
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Beginner Arduino ESP32 course — IoT from Blink to SmartNode · Part 7/8▼
Part 7/8 ·
WebServeron port 80, routes for relay ON/OFF. Check active-LOW vs active-HIGH on your module.
Frequently asked questions
Safe relay module?
Opto-isolated relay board; separate 5 V for coil; respect AC safety rules.
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ESP32 programming (1/8): Board intro, Arduino IDE setup & Blink
Free ESP32 Arduino course — part 1: DevKit, esp32 board package, Blink sketch, Serial Monitor. Roadmap: learn-arduino-esp32-from-scratch
Read more →ESP32 programming (2/8): Digital GPIO, buttons & debounce
ESP32 GPIO: digital I/O, internal pull-up, LED toggle, software debounce.
Read more →ESP32 programming (3/8): PWM — LED fade & SG90 servo
ESP32 LEDC PWM, smooth LED fade, ESP32Servo library for 0–180° control.
Read more →Does your startup need a tech partner?
Free chat about MVP, timeline, and the right profit-sharing approach.