Megapixel

When we buy a digital camera, we have always offered a camera with a variety of species, by stating how many megapixels they own.This is a common trait that is often mentioned digital camera manufacturers. From 3 to 12 megapixels or more, it seems that with each generation of digital cameras, there is a higher resolution image.
But what we need that megapixel? A mega pixel is represented by 1000000 (one million pixels).
So, if the maximum resolution digital camera provides an image 3000 pixels wide and 2300 pixels high, this camera has a resolution of 3000 x 2300 = 6900000 / 1000000 = 6.9 megapixels.
Speaking about the megapixels, the question arises: whether the high-megapixel camera with necessary? because high-megapixel cameras with more expensive.
If you intend to use the images on the Internet you will find that the maximum resolution of 1600 x 1200 will be sufficient. That means buy a 1.92 megapixel camera!
If you want to print pictures, you should consider the requirements of pixels per inch. 300 pixels per inch is standard in the printing of each image.It simply means that all you need to do to find the maximum width of printed images is to divide the width in pixels by 300.
3000 pixels / 300 = 10 inches maximum.
so it is recommended in selecting a digital camera tailored to the needs. it helps you prioritize the quality of optical zoom.

Book review Asuro Robot of Raffaello Bonghi

Asuro is a small programmabile robot in C with a microcontroller ATMEL ATMEGA8L. Been born like didactic robot, this is optimal for the first experimentations in the world of the robotics. The robot is reached in a box it of dimensions 20 x 17 x 7 cm Inside of the box it they were present: CD with handbook Card of the Asuro robot Card of the emitter Infrared Electronic and mechanical parts Material miscellaneous and a little ball from ping-pong. The robot appears without a doubt for a public young person, even if during the assembly a short guide is need of a sure preparation for being able to correctly knit the robot (inside of the handbook is present who explains the corrected use of the saldatore). After to have mounted the robot and the card for the seriale programming the robot turns out already operating thanks to a program already loaded inside with the PIC that verification the motors and the sensors of the robot. But now we begin to analyze to the card of the robot and all the fundamental characteristics, leaving from the microcontroller who it adopts.