Tutorials

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.

In the previous tutorial, we set up a soil moisture sensor and have its data readable via WiFi. However, that data is only accessible if the NodeMCU ESP8266 and the client (smartphone, PC, etc.) is in the same network. In this tutorial, we will use a service that allows us …

Plants need enough water to survive. But what if you forgot to water the plants? This multi-part ESP8266 tutorial aims to provide a simple soil moisture sensor that reminds you, via WiFi, that your flora needs a shower.

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 have shown in our Arduino relay tutorial. But did you know that there are different types of …

Last time, I featured the 0.96” OLED display and how to use with an Arduino microcontroller. If that screen was too small, you can try upgrading to a slightly larger 1.3” display. This tutorial aims to guide you on how to use the 1.3” OLED with popular microcontroller boards such …

The WeMos D1 Mini is a compact ESP8266 development board with 11 digital I/O pins, one analog input, and built-in WiFi. This guide covers the complete WeMos D1 Mini pinout, including the D0–D8 to ESP8266 GPIO mapping, I2C, SPI, UART, ADC, power and boot pins. After the pinout reference, we'll …

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 several different characters and graphics. Imagine what you can do if you have a MAX7219 cascaded dot matrix module.

Programming a microcontroller in assembly languages takes time and to reduce that time, embedded systems engineers often have tricks up their sleeves. One of those tricks is the use of lookup tables. In this post, I will share how I use lookup tables in assembly language for the PIC16F84A microcontroller.

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.