This window is called the Serial Monitor and it is part of the Arduino IDE software. Its job is to allow you to both send messages from your computer to an Arduino board (over USB) and also to receive messages from the Arduino. The message “Enter LED Number 0 to 9 or 'x' to clear” has been sent by the Arduino, and it is telling us what commands we can send to the Arduino which is either to send the 'x' (to turn all the LEDs off) or the number of the LED you want to turn on (where 0 is the bottom LED, 1 is the next one up right up to 7 for the top LED). Try typing the following commands, into the top area of the Serial Monitor that is level with the 'Send' button. Press 'Send', after typing each of these characters: x 0 3 5 Typing x, will have no effect, if the LEDs are already all off, but as you enter each number, the corresponding LED should light and you will get a confirmation message from the Arduino board, so that the Serial Monitor will appear as shown below.
There's also a wider breadth of hobbyist software. To take a number of TTL. Go buy a Trinket from Adafruit and load this code into it and it will. Adafruit Industries, Unique & fun DIY electronics and kits Adafruit Trinket - Mini Microcontroller - 5V Logic ID: 1501 - As of October 9th, 2015 the 5V Trinket comes.
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Serial transmission at 9600 bauds is possible with the Trinket ATtiny85 (5Volts, 8Mhz) from Adafruit. The analog value (0~1023) presented at the analog pin 1 is.
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I rather like the new board but since we're talking low-cost alternatives one thing to consider is buying Arduino-compatible boards directly from China. My personal experience with boards roughly the size of the Trinket has been as follows: I have purchased a Pro Micro [1] compatible with an ATmega32U4 chip and an on-board MicroUSB port from a Chinese seller on eBay for under $9 as well as two no-name Arduino Pro Mini variants with ATmega328 chips from two different eBay sellers for around $4 each, all fully working. At their price point the latter can compete with ATtiny85 chips directly despite being noticeably more powerful and more convenient to use in many cases. Atheros Driver Module here. I can't say much about the long-term reliability of those boards (my guess is that if you buy enough of them you'll notice that on average it isn't that great compared to that of boards with officially sourced MCUs) but the ones I got for myself and acquaintances (different models, six total) work as specified for now. The oldest one is over a year old and has been used in several different projects including one that ran continuously for 160+ hours. [1] An Arduino-compatible board designed by Sparkfun, [2].
While it can't use an external xtal, it still has an internal crystal oscillator which can clock it at some MHz, up 16 MHz I think. It's not as accurate but cheaper and more flexible. Brotherhood Codex Edition Unlocker Challenge.
I did a port of the Contiki OS to the Launchpad, which now comes with the msp430g2452 (16kB flash/256 B RAM) and the 'g2553 (16/512). At home I have them using cc2500-radios (2$ modules from aliexpress) and a radio duty cycling protocol I wrote, with plenty of flash space left for user applications. You can find the port at and a write-up at and with lots of measurements and other crowd pleasers. Well the interesting things probably involve using the SPI port to talk to some memory expansion.
At Google, Henner Zeller built a circuit pretty much like this that drove an RGB LED and was used for Test status 'orbs'. Basically with a bit of code your orb would turn red if your tests started failing in the continuous build. I used one to add a foot 'key' to my setup when playing World of Warcraft (it was my push to talk switch) but it could have been anything, it pretended to be a USB keyboard with one key:-). I've seen them used to pretend to be a mouse and move the mouse around (a 'jiggler') so that a machine wouldn't kick in the screen saver. All various sorts of things you might want to do with a bit of compute. Compared to an Arduino, this is smaller, consumes less power and has a 'standard' layout and costs about 1/3rd of an 'official' Arduino.