This semiconductor gas sensor detects the presence of alcohol gas at concentrations from 0.04 mg/L to 4 mg/L, a range suitable for making a breathalyser. The sensor’s simple analog voltage interface requires only one analog input pin...

This is a super-high intensity Luxeon Rebel LED, warm white in color. These LEDs provide optimized light quality and efficiency to address a number of project needs, including LED illumination. These LEDs can be blindingly bright and...

This is a rippled wide lens from Carlco Optics. Combine this lens with our Luxeon Rebel LEDs to control where the light is going and how bright it is. This lens produces a rippled beam with a 24° beam angle. It has a diameter of 20mm....

The TTS256 is an 8-bit microprocessor programmed with letter-to-sound rules. This built-in algorithm allows for the automatic real-time translation of English ASCII characters into allophone addresses compatible with the Magnevation...

The uLog is a tiny analog datalogger. Central to the logger is an ATtiny24 mated with an AT45DB161D 16Mbit flash IC. Sampling at 50Hz, it’ll log 3 channels of 10-bit ADC for about 2 hours before the memory fills up. Very stripped down...

This tiny audio amplifier is based on the Texas Instruments TPA2005D1. Its efficient class-D operation means low heat and long battery life. It can drive an 8-Ohm speaker at up to 1.4 Watts; it won’t shake a stadium, but it will provide...

The Cellular Shield for Arduino includes all the parts needed to interface your Arduino with an SM5100B cellular module. This allows you to easily add SMS, GSM/GPRS, and TCP/IP functionalities to your Arduino-based project. All you need...

These were really nice safety glasses. Then we decided to completely ruin them and slap the geek logo on there. Don't worry, it doesn't impair your vision... dangerously. Here our photographer, Juan, is helping our receiving guru, TJ,...

The EasyDriver is a simple to use stepper motor driver, compatible with anything that can output a digital 0 to 5V pulse (or 0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). EasyDriver requires a 7V to 30V supply to power the...

These headers are made to work with the Arduino Uno R3, Leonardo and new Arduino boards going forward. They are the perfect height for clearing the USB-B connector and great for stacking multiple shields. This kit includes 4 headers (2...

Here is a real time clock based on the DS3234 Real Time Clock IC. The DS3234 is a low-cost, extremely accurate SPI bus real-time clock with an integrated temperature-compensated crystal oscillator and crystal. The RTC maintains seconds,...

These small steppers are a great way to get things moving, especially when positioning and repeatability is a concern. When using a current limiting driver such as the Easydriver or Big Easydriver, a 12 volt power supply can be used as...