nokia 5110 LCD display AVR

Now i will write about nokia 5110 display.

Working with LCD display on HD44780 AVR

If you need only ready to use library, you can get it here.

Datasheet

I ordered display from ebay, 2 lines by 16 symbols.

How to work with Sharp Infrared sensor

I already wrote how to work with ADC In this article.

( In the simplest case ) Infrared Proximity Sensor - Sharp has 3 output pins: Vcc - Power, GND - Ground and Vo - Data. Depending on the distance varies the voltage at the output Vo, all that left is transform that data to digital information.

AVR Tutorial - ADC (Analog to Digital Converter)

ADC as you can guess converts analog voltage to digital number, so we could work with it in microcontroller. We can build simple ADC with comparator, it's a device which compares 2 signals (1 of them is some constant reference voltage) gives one otput if 1 signal is bigger and other if smaller.

ADC accuracy depends on it's resolution. e.g. if we have reference voltage = 5 V and our ADC is 10-bit, then on every bit we have 5 / ( 2^10 - 1 ) = 0.00489 or 5 mV, so we can't measure changes less than 5 mV.

Playing music on AVR with PWM

At first I tried to write code myself, but I failed many times.

So i searched for a working project and found it, AVR is using PWM and simple Piezo Buzzer.

Code taken from aquaticus.info
Sources on Github

LED matrix

I decided to play a little bit with LED matrix, so i will write what i found out.