Arduino Tutorial

I believe what makes Arduino popular is how it makes microcontrollers easier to use. I remember the time when I have to spent hours coding a project and then spend money on programming hardware. Arduino has its limitations, but the platform helps create tons of electronic projects even for non-engineers. …

If you've been using Arduino, you might have used or have heard about the ultrasonic sensor. Most of us use it for level/distance measurement while some use it to detect an obstacle in front. What most of us don’t know is that there is an underlying flaw with the ultrasonic …

The MQ-135 “air quality” sensor is part of the MQ series of gas sensors that uses a chemical sensitive element. The resistance of such element varies when exposed to certain gases. The MQ-135 is sensitive to multiple gases including Benzene, Acetone, Alcohol and Ammonium.

Ever since I wrote about timer interrupts, a number of readers have asked me on how to generate a 16-bit pulse width modulation (PWM) signal with Arduino. Well, here it is.

Current sensors can have different applications: power supplies, over-current protection, and motor control to name a few. In this Arduino current sensor tutorial, we will look at how to read current using the ACS712 sensor.

An Arduino magnetic sensor has several uses: for reading the speed of a rotating object, for door alarms and for navigation. In this tutorial, we will build a simple magnet detector using a hall effect sensor.

Relays in electronics are useful for controlling a high-power load using a smaller-power circuit. For example, an Arduino or PIC running on 5V, controlling a 240VAC light bulb, etc. This is what we shown in our Arduino relay tutorial. But did you know that there are different types of relay? …

Wouldn’t it be cool if you could control something by just waving your hands? Well, this is what the grove gesture sensor does. In this post, I will show you how to use this sensor with an Arduino and create a simple gesture control project.

With the 8 x 8 LEDs in a dot matrix, you can create quite several different characters and graphics. Imagine what you can do if you have a MAX7219 cascaded dot matrix module.

The ADXL345 is an integrated circuit that measures acceleration in 3 axes. Like most sensors, this device comes with an easy-to-use breakout board and is usable through SPI or I2C. This tutorial aims to show how you can interface this accelerometer with an Arduino.