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Detect touch on metal surface.
Toggle LED on/off with momentary push button.
Control DC motors using L293D or L298N motor driver.
Control RGB LED strip using Adafruit NeoPixel library.
Log LDR readings to ThingSpeak cloud with NodeMCU.
Detect motion using PIR sensor.
Play siren sound with passive buzzer.
Detect vibration or knock using piezoelectric sensor.
Control LED blink rate with potentiometer.
Read RFID cards using MFRC522 (RC522) module.
Receive wireless data with RF 433MHz receiver.
Send wireless data with RF 433MHz transmitter.
Detect rain or water droplets.
Control relay with PIR motion sensor trigger.
Display numbers on 7-segment single-digit display.
Detect smoke or gas with MQ-series sensor.
Measure soil moisture level.
Detect sound with digital sound sensor.
Record and play audio with sound recorder module.
Control LED brightness based on sound intensity.
Display numbers on TM1637 4-digit 7-segment module.
Detect tilt or orientation with tilt sensor.
Detect touch with capacitive touch sensor.
Measure distance with HC-SR04 ultrasonic sensor.