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Today we will build a circuit that uses an LED in a curious way - to detect brightness. We all know that LEDs have a certain color but some of these LEDs can also detect light. Obviously they do not have …
Today we will build two circuits to calculate the value of a resistor. The principle used in these circuits is the voltage division. The measurement is made with an analog port of a micro-controller. Hoje iremos construir dois circuitos para …
In the circuit of this article we will build a voltage comparator using an integrated chip called LM393. The LM393 is a dual difference comparator. This means that you have two independent voltage comparators. The circuit compares the input voltages …
In today’s circuit we will build an infrared detector. Additionally we will build a circuit to detect the type of frequency and to which manufacturer the codes belong. The latter uses an Arduino and a library to obtain this …
Increasingly, when designing a circuit, we find components that operate at different voltages than the microcontroller. This requires that, to work with them, it is necessary to implement a level shifter, that is, to ensure that there is a transition …
The circuits presented today allow the control of a LCD display that has a very common chip to be controlled by a micro-controller HD44780 or one that is compatible with this one. There are several formats for this LCD, however …
The circuit presented is a very popular circuit based on two IC 555’s. It produces a set of audible sounds that can be changed using the two potentiometers. The original circuit was published by Forrest Mims in a book …
Today will be presented a circuit to test bipolar PNP and NPN transistors . It is a circuit based on the 555. This circuit lets you check the type of transistor we have and if it is working properly or not …
Today’s circuit aims to control quite a few LEDs with few pins and without using other integrated chips. The technique used is called charlieplexing and was proposed in 1994 by Charlie Allen of Maxim, having nevertheless been the subject …
We will present several ways to use buttons as inputs for a circuit. The state of a button is the most basic form of binary logic it is open or closed, however when assembling a circuit you have to keep …