Global Positioning System (GPS) has been around since the 80's and is still one of the most important features you can add to any electronic system. The idea of tracking something (or someone) is cool enough but doing so without a telephone or an internet connection is much cooler.  In …

If somehow a 16x2 LCD or a Nokia 3310/5110 LCD is too large for your project, then there's a 0.96" display you can add to your arsenal. This display is OLED (organic LED) instead of LCD - which means the backlight is unnecessary. In this tutorial, we will look at …

Bluetooth is the most popular way of connecting an Arduino to a smartphone wirelessly. In this tutorial, we will create an Arduino-bluetooth interface and send messages from an Arduino to a smartphone and Arduino to a personal computer.

So far, we've been using HTTP in our NodeMCU web servers and while it works, the protocol is not really the best way for sending and receiving small-sized data for IoT applications. In this tutorial, I will introduce you to MQTT using ESP8266.

Last time we managed to display sensor data to a NodeMCU web server. The problem with that code is that we need to refresh the page manually in order to update the sensor value. A better method is to use Ajax (asynchronous javascript and XML) so that we can request …

Using the Beaglebone Black's PWM Bonescript also includes an analogWrite function which utilizes the 8 PWM pins of the Beaglebone Black. As you might already know, PWM allows us to control a servo motor. The analogWrite function accepts the pin name, duty cycle, frequency, and callback function as parameters. The …

Using the Beaglebone Black ADC One of the advantages of the Beaglebone Black over the Raspberry Pi is the presence of an analog-to-digital converter. There are 7 analog inputs, all at P9: To process analog signals, we’ll be using the analogRead() function. Note that the analog pins can only read …

Using a Button As you’ve noticed, the functions in bonescript are similar to Arduino’s. If we are to use an input device such as a button, switch, etc, we only need to change the direction using pinMode: var b = require('bonescript'); b.pinMode("P9_12", b.INPUT);   The script below reads the state …

There are instances when digital systems need to interface with devices that produce analog signals, such as sensors and radio equipment. In such cases, the digital system, such as a microcontroller, needs an analog-to-digital converter (ADC) to handle the analog signal.

Blinking On-board LEDs The simplest bonescript we can create right now is to blink one of the four user LEDs. The user LEDs are those four blue LEDs just above the miniUSB port: On Cloud9 IDE (192.168.7.2:3000), open a new file (click the + tab) and then paste the following …