Projects using this component
ESP32 Night Light with LDR
Night light where the LED automatically turns on in the dark and off in the light. The D0 (digital out) pin of the LDR Sensor Module is used - the dark threshold is set with the small potentiometer on the module, the module itself generates the HIGH/LOW output. ESP32 just reads this signal with digitalRead(), the code is very simple.
ESP32 RGB LED Control
Unlimited color generation with a single RGB LED instead of 3 separate LEDs. As in Arduino, we make a rainbow transition by setting the R/G/B values with analogWrite(). Color theory (such as red+green=yellow) is seen practically.
ESP32 LED Fade with PWM
Smoothly changing the brightness of the LED from 0 to max, from max to 0. We control PWM with analogWrite() as in Arduino - the same syntax as ESP32 Arduino Core 3.0+ works without problems. Pin definition + pinMode + analogWrite is enough.
ESP32 Police Strobe Light Effect
Simulate the strobe lights of a police car by rapidly flashing red and blue LED groups. Using 2 LEDs in each group makes the effect more dramatic. A classic example of fast toggle pattern and group control.
ESP32 Knight Rider LED
6 LEDs moving sequentially from left to right and right to left (Knight Rider style). A basic example of using for loops and arrays. Teaches the logic of direction change.
Reading Light Intensity with the ESP32 LDR Module
Real-time monitoring of the light value measured by the LDR module in the Serial Monitor + approximate lux value. Teaches the module’s calibration logic. It is ideal to complete this before Project 10, as it is used to determine the threshold value.
ESP32 Melody Playback with Buzzer
Playing a simple melody (Twinkle Twinkle Little Star) with a passive buzzer. We play notes with tone() and noTone() functions like in Arduino - ESP32 works with the same syntax as Arduino Core 3.0+. Passive buzzer must be used (active buzzer does not play melody).
ESP32 Motion Alarm System (PIR + Buzzer + LED + Telegram)
A smart security alarm system that activates the buzzer and LED when the PIR sensor detects motion, while simultaneously sending an instant notification to the owner via Telegram. It includes a 30-second cooldown to prevent false alarms. Suitable for home security, garage monitoring, warehouses, or workrooms. With ESP32-CAM, photo notifications can be added; with the classic ESP32 DevKit V1, text notifications are sent.
ESP32 LED Brightness Control with a Potentiometer (Analog → PWM)
In this project, we control the brightness of an LED analogically using a potentiometer. The ESP32's ADC pin reads the 0-3.3V voltage from the potentiometer, and this value is then converted into a PWM (Pulse Width Modulation) signal and sent to the LED. As a result, as you turn the potentiometer, the LED gradually brightens and dims. With Arduino Core 3.0+, `analogWrite()` can be used directly; on the ESP32-S2/S3, the ADC resolution is fixed at 12-bit.
ESP32 HC-SR04 Ultrasonic Distance Sensor
The HC-SR04 ultrasonic sensor calculates distance by measuring the time it takes for the sound wave it emits to bounce off an object and return (Time of Flight). In this project, we will send a 10-microsecond pulse to the TRIG pin of the ESP32 and read the echo duration from the ECHO pin using `pulseIn()`. We will display the calculated distance in centimeters on the Serial Monitor. Since the HC-SR04 operates at 5V, a **voltage divider** is required on the ECHO pin—otherwise, the ESP32’s 3.3V GP
ESP32 DHT22 Temperature and Humidity (with LCD Display)
This project measures ambient temperature and humidity using a DHT22 sensor and displays the data in real time on a 16x2 I2C LCD. Data is read from the sensor using the one-wire protocol via the Adafruit DHT library. This project serves as the foundation for IoT weather stations, smart home automation, or environmental monitoring systems in greenhouses. Communication with the DHT22 is established via the ESP32's GPIO 4 pin.
LED Blink with ESP32
Teaches basic GPIO output usage with ESP32. We achieve a blinking effect by turning an LED on and off from a digital pin. ESP32 version of the classic blink project on Arduino UNO; the pin map and syntax remain the same, the only difference is in the pin numbers.