… that contains an Arduino Leonardo board (microcontroller) and a number of outputs and inputs. There are a colored LED and a buzzer as outputs. And there is a light sensor, four buttons, a joystick, a microphone, an accelerometer, and a temperature sensor as …
… walkthrough gates at every entrance so that any person with the forbidden material when passes through the gate, the alarming buzzer automatically switched on. This happened because the walkthrough gates have the Metal Detector circuit in them that works …
… that limit, an LED will be turned on to show the there is something wrong. You can also attach a buzzer with the Arduino. When the fire will be detected buzzer will be turned on automatically. First if all I would like to share the complete source code for …
… a PIR sensor and a buzzer, as in our blind stick project. Intruder alarm: a PIR sensor and reed switches on the doors, with a SIM800L that sends an SMS alert. Parking assistant: a VL53L0X or an ultrasonic sensor with a buzzer that beeps faster as the car gets …