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Archives for Arduino Projects

Simple Microcontroller 5V DC Regulated Power Supply

In any electronic products or projects there is always a source of power for the system to work. This is called a power supply. The source of this power can come from different sources like the mains AC voltage, a battery or even from a renewable power source like a solar panel wind turbine or fuel cell to name just a few. The most common source of power is usually the mains AC, with this power, we need a transformer to convert the 220V 50Hz mains or the 120V 60Hz if you are living in the United States of America to a lower voltage required by the electronic circuit, this can be typically between 6V and 12V when 5V regulated DC is needed. In this article we are going to design a simple 5V DC power supply that can be used to power your Microcontroler projects using the 7805 voltage regulator.

Digital Thermometer using Arduino and LM35 Temperature Sensor

Temperature sensors are very important in many projects especially in temperature logging devices and alarms. In this article we are going to design a digital thermometer using Arduino Uno. This digital thermometer is built around the LM35 which is a precision integrated-circuit temperature sensor whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. Its output changes by 10 mV per °C so there is no need for calibration. It can measure a wide range of temperature from −55 to +150°C

Breadboard Regulated Power Supply 5V/3.3V

In any electronic product or project there is always a need for a source of power for the system to work. This is called a power supply. To get power hassle-free to the power lines of a breadboard can be a challenge, you will need a convenient and safe way to get either a regulated 5V DC or 3.3V DC depending on your application  on your breadboard power rails. In this project we are going to design step by step a simple  Breadboard power supply that takes power from a 6 to 15V DC power supply and outputs a selectable 5V or 3.3V regulated voltage using a switch. This board can be easily inserted into a breadboard using a .1" (0.254 cm) headers mounted on the bottom of the PCB. Pins labeled VCC and GND plug directly into the power lines of a breadboard.