a simple project IoT use ESP32 with dimmer AC lamp to control brightness lamp. Dimmer AC lamp use zerocross pin to detect 0 VAC and PWM pin to make PWM signal with dutycycle. in ESP32 progamming, ESP32 use external interrupt to detect 0 VAC and timer interrupt used to generate PWM signal. to connecting on firebase, this project use library <ArduinoJson.h> and <FirebaseESP32.h>.

• 1 x Robotdyn AC Dimmer Module, 1 Channel, 3.3V
• 1 x ESP32 dev doit
• 1 x fitting E27
• 1 x dimmable lamp 3 watt
• 4 x female-female jumper
• 1 x cable 2x0.75 sqmm
• 1 x power cable with electric plug