Using the getElementsByClassName() method in JavaScript
The getElementsByClassName() method returns an array of elements in a document that have a class name of a value we specify when using the method. It can be used to manipulate more than one …
Latest Tutorials
Measuring soil moisture with an Arduino
In this activity, we will use a soil moisture sensor to keep track of the amount of water in the soil surrounding plants so we can know when the soil …
Controlling a servo motor with an Arduino
Servo motors are motors that can be used to rotate parts of machines with precision. Small servo motors can be directly connected to an Arduino microcontroller board to control the position of …
Adjusting the brightness of an LED
LEDs can be switched between HIGH (on) and LOW (off) states when they are connected to the Arduino’s digital pins. However, digital output can only be in either of two …
Using an ultrasonic sensor with Arduino
In this tutorial, you will learn how to connect an ultrasonic sensor (HC-SR04) to an Arduino. An Ultrasonic Sensor is used to measure distance. It emits ultrasound at 40,000 Hz (40kHz) which travels through the …