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from Instructables.com

Robot "Cheaper"

Minimalist 2-wheeled robot, built for MakeThings event in Vienna. It uses Arduino Uno and 2 servo motors, powered up by 4 AA batteries and senses world with infrared distance sensor.

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from Gizmodo

The 8 Cheapest Computers in the World

The 8 Cheapest Computers in the World highlight on the Raspberry Pi with a custom case.

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Adruino Board for robotics. http://arduino.cc/en/Main/ArduinoBoardUno

from Instructables.com

Simplest and Cheapest Arduino

Use a ATTiny85 (can be ATTiny45, ATTiny44) to make an Arduino just for US3.00 and name it as Tiny Arduino. Tiny Arduino have only eight pins as shown in figure above, Pin4 is ground (Gnd), Pin8 is 5V (Vcc), Pin1 is Reset, Pin2 and Pin3 originally used to connecting the Crystal. In order to utilize all the IO, the internal oscillator (RC Oscillator) is used to replace the external clock which require a crystal. Therefore the Tiny Arduino is now come with five IO. Below shows the Arduino IO functions. 1. There are five IO, each IO can be Input or Output 2. Among the five IO, two of the IO can perform as PWM 3. Among the five IO, three of the IO can perform as Analog Input I2C may require to extend the features of Tiny Arduino.

from Instructables.com

Simplest and Cheapest Arduino

Picture of Simplest and Cheapest Arduino

from Scoop.it

Simplest and Cheapest Arduino

Use a ATTiny85 (can be ATTiny45, ATTiny44) to make an Arduino just for US3.00 and name it as Tiny Arduino.Tiny Arduino have only eight pins as shown in figure above, Pin4 is ground (Gnd), Pin8 is 5V (Vcc), Pin1 is Reset, Pin2 and Pin3 originally used to connecting the Crystal. In order to utilize all the IO, the internal oscillator (RC Oscillator) is used to replace the external clock which require a crystal. Therefore the Tiny Arduino is now come with five IO. Below shows the Arduino IO functions.1. There are five IO, each IO can be Input or Output2. Among the five IO, two of the IO can perform as PWM3. Among the five IO, three of the IO can perform as Analog InputI2C may require to extend the features of Tiny Arduino. | Arduino progz

Arduino Nano for only $13 + FREE shipping! Goto: http://worldclassoffers.com/?p=1804

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from Instructables.com

The cheapest and simplest method to control arduino through ethernet

A video on how to control arduino through ethernet. Full two way communication both sending and reciving! Shows the overview, wiring instructions, arduino sketch, testing as well as an extra part on creating an android app that communicates with the server on the ethernet module. arduino sketch below, just copy and paste // A simple web server that shows temperature and controlls an LED #include "etherShield.h" #include "ETHER_28J60.h" #include OneWire  ds(A3);  // on pin A3 int celsius,celsiusF; int outputPin = 3; //the LED pin static uint8_t mac[6] = {   0x54, 0x55, 0x58, 0x10, 0x00, 0x24};   // this just needs to be unique for your network, // so unless you have more than one of these boards // connected, you should be fine with this value. static uint8_t ip[4] = {   192, 168, 1, 15};                       // the IP address for your board. Check your home hub // to find ...

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This video covers the basics of diodes, bridge rectifiers, and how to build simple unregulated AC to DC power supplies than can handle a few mA up to several...

Perhaps the cheapest Arduino you can get. USB Nano V3.0 ATmega328P 5V/16M Microcontroller CH340G.