Tips and Tricks | Embedded Lab

Category Archives: Tips and Tricks

How to measure capacitance with a microcontroller?

Posted on February 15, 2011 by R-B 2 comments

Microcontrollers are widely used in measuring various physical variables. The techniques involved in the measurements could be different for individual variable type and are mostly based on the characteristics of the variables to be measured. This tutorial describes some methods for measuring the capacitance of a capacitor using microcontrollers. The techniques use the characteristics of the capacitor itself and are therefore universal and can be easily implemented with any microcontrollers.

Where do I buy my electronics components from?

Posted on February 14, 2011 by R-B 4 comments

I have been living in Southern Virginia for past 3 years and I haven’t seen any retail store to shop for electronics components that are needed for my projects, except the Radioshack stores. I don’t prefer to go to Radioshack as the prices are much higher than my budget. A few years ago, I discovered an online store named Futurlec. I was surprised with their prices, their stuffs were really cheap and of good quality. I made 4 orders in the first year, and I was very happy with what I got. The only problem was they shipped their items

Theory of Matrix Keypad

Posted on February 13, 2011 by R-B One comment

Tact switches are widely used as digital input devices. Normally one tact switch requires one digital I/P pin of a microcontroller but if you want to interface a matrix of such switches (say a 16 digit keypad), assigning a digital I/O pin for each key won’t be a good idea. You need to think about the way to minimize the required number of digital I/O pins of microcontroller. A very popular method is a keypad matrix where the keys are arranged into rows and columns so that a 4×4 (16) tact switches can be interfaced to a microcontroller using only

MikroC Pro for PIC : Installation and Setup

Posted on February 12, 2011 by R-B 5 comments

My PIC tutorials and projects use MikroC compiler for firmware development. But I don’t think I ever posted anything on its installation and setup. Today, I am going to show how to install MikroC Pro for PIC (v4.60) on a Windows PC. First of all, download the zipped installation file from here, unzip it and run the setup program. Installation is straightforward. When you first start the MikroC compiler, it opens a LED blinking example project. You can close this project by clicking on ‘Close Project’ under Project menu.

Why pay for Serial LCDs when you can make your own?

Posted on October 2, 2010 by R-B 20 comments

HD44780 based LCD displays are very popular for embedded projects because they are cheap, easy to interface, can display characters, consume power lot less than seven-segment displays, and most of the present day compilers have in-built library routines for them. However, the only disadvantage is that they require at least 6 I/O pins of microcontroller. Well, you may ask, isn’t that less than what seven-segment displays require? Yes, that’s true but there are circumstances where you don’t have left enough pins for LCD display. For example, if you are going to design a temperature sensor based on a PIC12F683 microcontroller,