Archive for 'Electronics'

Working with the Comparator Circuit

March 15, 2010 by , under Electronics.

Sometimes in the embedded system world we need to process the analog world and sending the signal to the microcontroller when the analog signal exceed some predetermine limit we’ve set. Some example of this situation is to send the interrupt signal to the microcontroller operation when the temperature is already exceeds certain limit or the light intensity exceeds certain bright level. This is when the comparator circuit becomes handy as it’s designed specially for this purpose. (more…)


Make your own Microcontroller Printed Circuit Board (PCB) using the Toner Transfer Method

January 3, 2010 by , under Electronics.

As the electronics hobbyist one of knowledge that we have to be familiar with is how to make our own printed circuit board (PCB). Making our own simple single side PCB actually is not require a sophisticated technique and technology as you might think, instead most of the required materials is already available at your home. I’ve started make my first single side through-hole PCB for a simple two transistors astable multivibrator project using just a water proof marker and draw the PCB layout directly on the PCB copper surface. (more…)


Powering Your Microcontroller’s Base Project

February 28, 2009 by , under Electronics.

A good power supply is an essential subject to the microcontroller’s base project; it’s like a heart that gives a life to our microcontroller. Sometimes we take it for granted the important of having an adequate power supply to our microcontroller project and this can lead to the unexpected result or behavior from the circuit. (more…)


Using Transistor as a Switch

December 23, 2008 by , under Electronics.

Most of microcontrollers work within 5 volt environment and the I/O port can only handle current up to 20mA; therefore if we want to attach the microcontroller’s I/O port to different voltage level circuit or to drive devices with more than 20mA; we need to use the interface circuit. One of the popular method is to use the Bipolar Junction Transistor (BJT) or we just called it transistor in this tutorial. (more…)


Basic Resistor Circuit

November 19, 2008 by , under Electronics.

Resistor basically is used as a current limiter or current/voltage divider in electronics circuit. Resistor value is measured in Ohm (Ω) name after George Simon Ohm who first to lay down the fundamental relationship among Resistance, Current and Voltage. (more…)

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How to read the Resistor value

November 12, 2008 by , under Electronics.

Resistor is one of the electronic component that used in electronic design for controlling the flow of electric current. The more it resists the small the electric current will flow and vice verse. The resistance value is measured in ohm which is named after Georg Simon Ohm who first define the well known Ohm law, the fundamental relationship among Resistance, Current and Voltage. The symbol of resistance is the Greek letter omega (Ω). (more…)

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