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. Voltage sources and short circuits As explained in this post, a voltage source imposes a voltage difference across two points, as shown in figure 1. This means that, between points A and B, there is …
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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. HC-06 HC-06 is a cheap Bluetooth module that supports SPP (Serial Port Profile), which allows the establishment of an emulated serial connection using Bluetooth. This connections is transparent for the microcontroller, since the module handles all …
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.
Voltage sources and resistors
This post explains some very basic principles about electronics, namely DC voltage sources and resistors.
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