Raise your Arduino off of your workbench! Avoid shorts with solder balls, snipped wires, pennies... etc. 
Product Details...

Red LED, 5mm, clear
Warning, warning, the Red LED is on! 
Product Details...

Ultraviolet LED that glows purple. 
Product Details...

Photoresistor/Light Sensor
This little sensor detects light intensity. More light allows more current to flow. Use this sensor to turn something on/off when it is day/night, follow a light source, etc. 
Product Details...

Reed Switch
This is a non-contact magnetic switch. Put a magnet near it and the switch closes, and current flows. Take the magnet away, and the switch opens. Perfect for detecting doors opening, etc. 
Product Details...

This little magnet is crazy strong. Seriously, put 2 of them together and it is difficult to separate them! Perfect for reed switches. 
Product Details...

Is it hot in here? This digital temperature sensor will tell you, with 9 to 12 bit resolution! Uses only 1 wire to the microcontroller for communication. Simple to use and highly accurate. See our tutorial section for instructions and Arduino software. 
Product Details...

10k Linear Trimming Potentiometer, breadboardable (see photo). Good for analog to digital converter input. Use this to set a variable input for control. 
Product Details...

Piezo Buzzer, a loud one. Plug this directly into an Arduino/microcontroller IO pin and use it to signal events. With no resistor, this thing is LOUD. But you can tone it down as low as needed with a resistor or potentiometer. 
Product Details...

This pack includes an LCD module of your choice, and everything else you need to connect it to your Arduino. See our Tutorial section for step by step instructions. Soldering is required, but the male header pins are included. 
Product Details...

We are now shipping the newest Arduino Mega R3 board with the Mega 2560 chip, Rev 3! Arduino Mega board, fully assembled, with free 6' USB 2.0 cable. Click through for the specs. 
Product Details...

Now shipping the newest Arduino Mega R3 board with the Mega 2560 chip! Arduino Mega board, fully assembled, solderless breadboard, wire jumpers, resistors, LEDs, etc. 
Product Details...

Solderless Breadboards with split power rails on each side. Measuring 2.13" X 6.5". 
Product Details...

The countdown display you have seen in all of the spy movies, except this one is better, its blue! 1 1/8 x 3/4 x 5/8 inches 27.7 x 20 x 10 mm 
Product Details...

Hello World indeed! Let your Arduino talk to the whole world via the Internet! This fully assembled Ethernet shield fits on top of the Mega/Duemilanove/Uno and is easy to program. This newest version includes a micro SD memory card slot. 
Product Details...

Arduino Motor Driver Shield Kit. This item is discontinued, see the Adafruit motor driver shield for something better. 
Product Details...

The countdown display you have seen in all of the spy movies. 1 1/8 x 3/4 x 5/8 inches 27.7 x 20 x 10 mm 
Product Details...

This Arduino kit is perfect for learning about interfacing with Arduino. It comes with an Arduino Uno board, and several different kinds of sensors to learn and play with. 
Product Details...

USB to Serial device that is breadboardable. 
Product Details...

16 x 2 LCD, 5 volt, based on the popular HD44780. This LCD comes in evil red, with back light. 2 rows, 16 characters per row. The red coloring of this LCD makes it great for indoor, darker environments. Check out our tutorial section for instructions. 
Product Details...