Adafruit

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US$53.82
Rather than spending weeks or months fiddling with algorithms of varying accuracy and complexity, you can have meaningful sensor data in minutes thanks to the BNO055 - a smart 9-DOF sensor that does the sensor fusion all on its own!  You can read the data right over I2C and Bob's yer uncle.
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US$49.95
This breakout has a 2.7" tri-color (red, black, and white) display. It has 264x176 black and red ink pixels and a white-ish background. Using our CircuitPython or Arduino libraries, you can create a 'frame buffer' with what pixels you want to have activated and then write that out to the display. Most simple breakouts leave it at that. But if you do the math, 264 x 176 pixels x 2 colors = 11.5 KBytes. Which won't fit into many microcontroller memories. Heck, even if you do have 32KB of RAM, why waste 12KB?
Delivery within 2-3 weeks
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US$44.10
Easy e-paper finally comes to microcontrollers, with this breakout that's designed to make it a breeze to add a tri-color eInk display. Chances are you've seen one of those new-fangled 'e-readers' like the Kindle or Nook. They have gigantic electronic paper 'static' displays - that means the image stays on the display even when power is completely disconnected. The image is also high contrast and very daylight readable. It really does look just like printed paper!
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US$21.61
This lovely little display breakout is the best way to add a small, colorful and very bright display to any project. Since the display uses 4-wire SPI to communicate and has its own pixel-addressable frame buffer, it can be used with every kind of microcontroller. Even a very small one with low memory and few pins available! The 1.14" display has 240x135 16-bit full color pixels and is an IPS display, so the color looks great up to 80 degrees off axis in any direction.
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US$12.17
Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening project. There are two 1/2" (Nominal NPS) outlets.
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US$38.50
Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening, aquarium, or pool project. There are two 1/2" (Nominal NPT) outlets.
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US$5.17
This adapter will let you plug into a US 2-prong power adapter in the following locations: Bahrain, Bangladesh, Belize, Bhutan, Channel Islands, China, Cyprus, Dominica, Falkland Islands, Gambia, Ghana, Gibraltar, Grenada, Guatemala, Guyana, Hong Kong, Indonesia, Iraq, Ireland, Isle of Man, Jordan, Kenya, Kuwait, Lebanon, Macau, Malawi, Malaysia, Maldives, Malta, Mauritius, Myanmar, Nigeria, Oman, Qatar, St. Kitts and Nevis, St. Lucia, St. Vincent, Saudi Arabia, Seychelles, Sierra Leone, Singapore, Tanzania, Uganda, United Arab Emirates, United Kingdom, Vietnam, Yemen, Zambia, Zimbabwe.
Delivery within 2-3 weeks
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US$5.17
This little dongle will let you connect one of our 5V 2Amp or 5V 10Amp adapters to something that expects to connect to USB. The premise is simple - one end has a USB A female jack and the other has a 'standard' 5.5mm OD/2.1mm ID barrel jack with center positive polarity. 
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US$26.17

This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC.

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US$10.42
This panel mount extension cable will allow you to extend an HDMI connection and secure it to an enclosure. Perfect for placing your Raspberry Pi in a secure box. Two M3 screws are used to attach the female socket end, 1"/25.4mm apart. Two hex-screws are included and the hex nuts are embedded inside the molded end. 
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US$1.32
977 Adafruit TO-220 Clip-On Heatsink Get the most out of your regulators, transistors and other TO-220 packaged chips by clipping on a heat-sink. Your...
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US$6.92
Useful when you want to attach a 'bulky' USB device without blocking a secondary port.
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US$3.42
Stretch out your servo connections with this flexible servo extension cord. It has a 3 pin shrouded "male" connection to plug your servo into and then, 30cm later, a 3 pin female connection. It even keeps the common red/black/white color coding.
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US$22.67

This GPS antenna draws about 10mA and will give you an additional 28 dB of gain. It's got a 5 meter long cable so it will easily reach wherever you need it to. The antenna is magnetic so it will stick to the top of a car or truck (or any other steel structure).

Delivery within 2-3 weeks
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US$9.05
Miniature 8x8 Blue LED Matrix, Common Cathode   You will squeal with delight when you hold this adorable miniature LED matrix. 0.8" square, its got...
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