Arduino Introduction

I recently started developing with Arduino. In the old days we had to develop everything from the scratch. Arduino and other DIY kits makes it lot easier. If you are in two minds whether to buy Arduino or `Raspberry Pi`. I would simply say, If your project is something to do with hardware Arduino is most suitable. If your project is something to do with software more then `Raspberry Pi` would be a better choice. But notice that you need to think other factors as well.

I ordered chineese Ardunio UNO R3 version board. Almost every functionality as original UNO and few things more. major difference is CH340 chip for USB-Serial instead of ATmega16U2.So it won't be automatically detect and install drivers for you. You need to install CH340 drivers first. Main programmable chip is same ATMega328P.

this is how Arduino UNO clone look likes
But never trust, a chinese... received a malfunctioning ATMEGA328P microcontroller. So I went pettah market(Sri Lanka), ATMega328P microcontroller costs 390 LKR only. Finally seller agreed to refund 5 USD.

However i bought another Arduino UNO from here SL, costed me around 1600 LKR. Atleast it is more look like genuine.

this is another Arduino UNO more or less look like genuine
Following are the specifications of Arduino UNO R3;

Clock Speed16MHz (but ATMega328P supports 20MHz)
Flash Memory32K (ATMega328P) 0.5KB used by bootloader
SRAM2K (ATMega328P)
Digital I/O Pins14(in which 6 PWM output supported)
Analog Output Pins6
DC current per I/O pin40mA
DC current per 3.3V pin50mA
Operating Voltage5V
Input Voltage6-20V but 7-12V recommended

Arduino UNO R3 Pinout diagram


Rasika Perera

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