Arduino Tutorial

The DHT22 temperature and humidity sensor is a common sensor; in fact, there are tons of tutorials out there teaching you how to use it with your Arduino, Raspberry Pi or other microcontrollers. What prompted me to write about this sensor is my curiosity on how it gives out two …

I recently got my hands on a 3D gesture sensor from DFRobot and honestly, my brain is ringing with the possible projects I can do with it. Basically, it is a device which can sense hand movements in different directions. Imagine controlling anything just by waving your hands! Let's get …

In control systems, a controller corrects the output of a particular system to a desired input in the presence of errors and disturbances. The most popular type of controller is PID which is an acronym for Proportional, Integral and Derivative. In this Arduino PID control tutorial, I will show you …

RFID technology has been around for quite a while. But it was only recently that hobbyist and makers was able to utilize this technology through the Mifare RC522 RFID module. In this article, I will show you how you can easily use cards as keys for anything, from attendance systems, …

Using a keypad is an upgrade over using buttons for input on your Arduino project. Actually, a keypad is a set of 12 or 16 buttons wired so that the pin usage is reduced. In this tutorial, I will explain how a keypad matrix works and how to use it …

The ESP8266 has been a blessing to makers who need to connect their Arduino to the Internet on the cheap. In fact, boards like the NodeMCU and WeMos which feature the ESP module has become overly popular.  This is unsurprising given that these boards can replace the Arduino without a …

Electronics projects like movement and obstacle detection, drones, and robots require a camera for capturing images. I personally recommend using a Raspberry Pi or BeagleBone Black for these kind of projects because the Arduino doesn’t have enough juice to handle the complexities of pictures and, more so, videos. However, if …

I’ve already covered the basics of how a PIR motion sensor work on my previous tutorial. DFRobot was kind enough to send me a free sample of their PIR motion sensor. So naturally, I got to play with and write about it today. Two of a Kind It turns out, …

On my previous Arduino Interrupt tutorial, I showed how to use the external and pin change interrupts for the ATMega328p-based Arduinos. There, I showed an example where pressing a button halts the normal program execution any time and serves another routine (called ISR). In this article, we’ll look at how …

An interrupt, in microcontroller context, is a signal that temporarily stops what the CPU is currently working at. Programming using interrupts is very different from the usual top-to-bottom sequence in an Arduino program and thus can be confusing for some. This article aims to introduce how an interrupt works and …