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A nice, compact 5mW green laser. Fun, but don't point in anyone's eyes.
Give your project a voice, and more than just pre-recorded messages on loop! The EMIC 2 takes a serial string and turns it into synthesized voice.
This is the basic laser card module with circuitry built in so that it can be turned on/off with a TTL signal.
Here's the official Arduino Ethernet Shield With PoE Module
This is a speed sensor, designed to check the rate of a motor.
Compact, inexpensive, and LASER. Enough said.
OLEDs are simply the next step up in display technology. Sure, a regular LCD may work, but you should use OLEDs when you need a much brighter display, much better viewing angle and lower current consumption!
Think of this as a audio robotic digestive system. It'll eat 20 whole seconds of sound before barking it back at you with beautiful clarity, maybe not exactly as you remember it but pretty close!
This 20 character by 2 line LCD, comes with an easy to use serial communication interface and has the capability to connect up to a 5 by 5 matrix style keypad.
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