ESP8266: Controlling a buzzer
The objective of this post is to explain how to control a passive buzzer module using an ESP8266.
Electronics
Real Time Clock: DS3231
The objective of this post is to describe the main functionalities of the DS3231, a very accurate real time clock from Maxim.
Buying cheap electronics at Ebay: Part 1
This post lists some components to create a basic electronics prototyping kit, which can be bought for very low prices at eBay.
Laws of electronics: KCL
This post describes one of the basic laws of circuit analysis, more precisely KCL (Kirchhoff’s Current Law), which states that the the sum of the currents leaving and entering a node is zero.
Using a ULN2803A to control a DC motor
This post explains how to use the ULN2803A IC to control a DC motor, using an Arduino board.
Shorting a voltage source conceptual error
This post describes some conceptual errors with voltage sources, that arise from the definition of voltage source and short circuit.
Toggling a LED with Arduino and HC-06
Following the previous post describing the HC-06 module, this one shows how to use it to build a simple program to toggle the debugging LED of an Arduino board, using Bluetooth. This tutorial assumes the use of the HC-06 integrated in the baseboard described in the previous post.
Arduino Bluetooth with HC-06
This post describes the HC-06 Bluetooth module and shows a simple app to turn on and off a lamp with an Arduino board.
Resistors calculations and voltage divider
This post explains some basic calculations with resistors and voltage dividers.
Cheap power supplies
This post lists some cheap options for power supplies to use in electronic and embedded systems projects.