## Linear Mapping of Input Range to Output Range

Whenever you mix sensor input values and electronics, you always get a situation where the data read from the sensor needs to be interpreted or changed or scaled to be used by your control software.

Mapping or scaling a linear range of input values to a linear range of output values is as easy as: $y=mx+c$

## Bio-metric Attendance

Attendance is part of any learning environment. If you do not attend the lectures or practical sessions, your chances of failure increases.

For years I took attendance either by making a class list available for the students to sign or by calling out each student's name. But this was only part of the process! The other part involved entering the attendance onto either a spreadsheet or web based system in order to gather some statistics. For small classes this might not be an issue, but for large classes... It becomes a mess!!

Since I love automation, I decided to design a bio-metric attendance solution using a fingerprint scanner, an Arduino Mega and an ITDB3.2 inch TFT LCD.

# So I broke my touch screen ...

I've been busy with a new project where I use the 3.2" TFT Touch screen from ITEAD Studio. While testing the application I noticed that the back-light's brightness change every time I push a button on the screen. AHAA!! - Bad connection! So I started pressing on the edges of the screen, to find out where this is coming from...

SNAP!!!

The screen broke...