L298N: motor control module for Arduino


There are many modules for Arduino or for use in DIY projects by makers. In the case of the L298N it is a module for motor control. With them you can use simple codes to program our Arduino board and be able to control DC motors in a simple and controlled way. Generally, this type of module is used more in robotics or in actuators using motors, although it can be used for many applications.

We have already introduced everything necessary about the ESP module, with ESP8266 chip, a module that allows to extend the capacities of the Arduino boards and other projects to have WiFi connectivity. These modules can not only be used alone, the good thing is that they can be combined. For example, we can use an ESP8266 for our prototype and the L298N, which would give us an engine that can be controlled over the Internet or wireless.

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LM35: complete information about this temperature sensor



Sensors are devices widely used in a multitude of circuits. There are temperature, humidity, smoke, light, and a long etc. They are elements that allow to measure some magnitude and to transform it into a voltage response. The analogical output signal can be easily transformed to digital, so that this type of sensor can be used with digital circuits, LCD screens, an Arduino board, etc.

LM35 is one of the most popular and used sensors of all, as it is a temperature sensor. It comes packaged in a similar package to the transistors we discuss in this blog, such as the 2N2222 and BC547. What it does is measure the ambient temperature and depending on whether it is higher or lower, it will have one or another voltage at its output.

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LM317: all about the adjustable linear voltage regulator


A voltage regulator or voltage regulator is a small electronic device to make the voltage constant in a circuit. It is often seen on components such as power supplies and power adapters. In this case, the LM317 is a small adjustable linear voltage regulator encapsulated in a shield similar to the one we saw in the case of transistors.

Many electronics or makers often use the LM317 for some projects where you need to work with a stable voltage or href=”https://www.oshardware.net/arduino-modulo-rele/”> where it transforms from one type of voltage to another, etc. In these cases, the destabilized voltage signal or the effects on the signal when switching from alternating to direct current is not suitable for feeding into direct current circuits if it is not previously treated with this type of device.

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Transistor 2N2222: all you need to know

transistor 2n2222

The transistor 2N2222 or PN2222 is another of the most used transistors together with BC548. So, if you like DIY and you are a maker, surely at some point you have needed one of these devices. In this case, the PN2222 is a low power silicon transistor and designed for linear amplification and switching applications.

The reason it is so in demand is that it is good at amplifying small currents and small to medium voltages, as well as being able to work at medium high frequencies. That means that it has a general use and is quite popular among radio amateurs. Those who are will know that it is one of the transistors used for the construction of the BITX transceiver, or that it allowed the Norcal Amateur Radio Club to launch in 1999 a challenge to build a radio transceiver with only 22 such transistors without any additional ICs.

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Transistor BC547: all you need to know

Transistor BC547

If you are a maker, you like DIY and electronics, you have probably ever needed to use a BC547 transistor. This is a bipolar junction transistor that was originally developed by Philips and Mullard between 1963 and 1966. Initially it was named BC108 and had a metal housing type TO-18 (Transistor Outline package – case style 18). This package was much more expensive than the plastic equivalent TO-92, but the heat dissipation was better in the first package.

Later it would have a new plastic package and renamed with the code BC148. And it was evolving from BC108, BC238, to what we know today as BC548 with a cheaper TO-92, package and from here the variants like BC547 emerged. The differences between the series were basically the packages, being equal inside them. Furthermore, by its acronym BC it shows that it is a Common Base topology, achieving a high voltage gain in its output without inverting the output signal. Unlike EC (Common Transmitter), which is the only one to achieve both voltage and current gains, and CC (Common Collector) very useful to adapt stages with very different impedances respectively.

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