ADJ. INTERVAL TIMER KITVelleman # MK111. For intermittent operation of circuits and equip-ment. Use for blinking light control, slide projector control etc. Pulse time adjustable between 0.5 and 5 seconds. Pause time adjustable between 2.5 and 60 seconds. 3 Amp output relay.Power supply 12-15 Vdc @ 100 mA (not included).CAT# MK-111 $9.95 each

ELECTRONIC CRICKET KIT Automatically comes on when it gets dark. Adjustable chirp rate, light sensitivity and tone. 9V operation. Battery not included.CAT# MK-104 $8.95 each

IR LIGHT BARRIER, KITAnnounce visitors, warn against burglars, set boundaries, for science projects, with audible (85dB) and visible (LED) alert. Range: 3.3ft to 13ft. Power supply: transmitter: 9V DC / 50mA max. Receiver: 9V DC / 20mA max. 9V battery holderand adapter jack included. Transmitter: 2.2" x 1.6". Receiver: 3.9" x 2.0" CAT# MK-120 $10.75 each

BRAIN GAME - FOLLOW THE LIGHTSSimple DIY kit. Use the four pushbuttons to repeat a randomly generated pattern shown on the 4 LEDs. The pattern is played both visually & audible or visually only (selectable). 4 difficulty levels. Replay speed gradually increases. CAT# MK-112 $9.95 each

FAST FRIENDLY SERVICE90

LOGIC LEVEL CONVERTER, BI-DIRECTIONALBi-directional logic level converter safely steps down 5V signals to 3.3V and steps up 3.3V to 5V at the same time. This levelconverter also works with 2.8V and 1.8V devices.0.63 x 0.52" (16.05 x 13.33mm). CAT# LLC-46 $2.95 each

ARDUINO PROTOSHIELD KITThe ProtoShield mates with the Arduino USB board and gives the user a small soldering area, two general LEDs, access to a BlueSMiRF socket, a general pushbutton switch, and most important of all - the Arduino reset switch is brought to the top level.CAT# APS-14 $9.95 ea. • 10 for $8.95 ea.

ARDUINO PRO MINI 328For users that understand the limitations of system voltage (3.3 or 5V), lack of connectors, and USB off board. Not populated with connectors so you can solder any connector or wire with any orientation you need. We recommend first timeusers start with the Uno R3 (CAT# ARD-21 above).3.3V / 8MHZ Pro Mini 328 CAT# ARD-14$9.95 each • 10 for $8.95 each5V / 16MHZ Pro Mini 328 CAT # ARD-18$9.95 each • 10 for $8.95 each

ARDUINO PROGRAMMINGSTARTER KITThe SparkFun Inventor's Kit is a great way to get started with programming and hardware interaction with the Arduino programming language. Includes everything you need to complete 15 circuits that will teach you how to readsensors, display information on an LCD, drive mo-tors, and more. You don't need any previous pro-gramming or electronics experience to use this kit.CAT# SFA-22 $99.95 each10 for $89.96 each

ATMEGA328 W/ ARDUINO OPTIBOOT (UNO), DIP Pre-loaded with the Arduino Optiboot (Uno 16MHz)Bootloader, to use Arduino code in a custom em-bedded project w/o using an actual Arduino board.CAT# ARD-24 $5.50 ea. • 10 for $4.95 ea.

UNO R3Everything needed to support the onboard ATmega328 microcontroller; connect to a computer with a USB cable or power it with a AC-to-DC adapter or battery. It has 14 digital input/outputpins (6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB con-nection, a power jack, an ICSP header, and a resetbutton. This version of the board has a socketed /replaceable ATmega328 chip (see CAT# ARD-24).Recommended operating voltage, 7-12 Vdc.CAT# ARD-21 $24.20 each

Arduino is an open-source physical computingplatform based on a simple i/o board and a devel-opment environment that implements the Process-ing/ Wiring language. Arduino can be used todevelop stand-alone interactive objects or can beconnected to software on your computer (e.g.Flash, Processing, MaxMSP). The open-sourceIDE can be downloaded for free (currently for MacOS X, Windows, and Linux).We carry Arduino microprocessors and relatedproducts. See our online store for full descriptions.

ARDUINO PRODUCTS

SPARKFUN "REDBOARD" WITH ARDUINOSparkfun # 12757. An economical alternative to the Arduino Uno, has most of the features of the Uno with the added benefit of an ISP header & FTDI interface.The RedBoard can be programmed over a USBMini-B cable using the Arduino IDE: Plug in theboard, select "Arduino UNO" from the board menuand you're ready to upload code. SDA, SCL andIOREF pins will be compatible with future shields.This version adds an SMD ISP header for use withshields. You can power the RedBoard over USB orthrough the barrel jack. The on-board power regu-lator can handle anything from 7-15 Vdc.CAT# ARD-22 $19.95 each