Adafruit

US$9.54
Quick connector wire sets will make wiring up our arcade-style or metal waterproof buttons quicky-quick. Each wire comes as a 'pair' with two 0.11" quick-connects pre-crimped onto 20cm long wires.
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US$8.67
These are half the width of classic 6mm tactile switches so they line up better on a breadboard, just plug them into every-other row. These work best in a PCB but can be used on a solderless breadboard. The two pins are normally open (disconnected) and when the button is pressed they are momentarily closed.
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US$4.75
One cable per order. The ribbon cable is 0.06mm/0.025" pitch and the connector is a 1.27mm (0.05") pitch 2x5 box. These are not for use with programming most AVRs or other large devices that have 0.1" pitch connectors so be aware which you need!
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US$4.38
This 4" / 100mm long flexible uFL 2.4GHz antenna has approx 4DBi gain and a 50Ω impedance so it will work fantastically with just about any 2.4-2.5GHz wireless receiver/transmitter such as the Adafruit CC3000s! Antenna comes with a uFL (a.k.a u.FL / IPX / IPEX) connector, so no more need for additional adapters to get your IoT cloud flying high!
Delivery within 2-3 weeks
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US$2.23
As an addition to our other USB DIY shells, we have a 'micro B female' in a panel-mount-like connector. This isn't true panel mount but you could glue the black plastic shell into your project and then press-fit in the micro B connector. The 5-pins are much easier to solder than a surface mount connector.
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US$27.92
Inside each segment is 3 red/green/blue LEDs, for 21 LEDs total. The anodes are all connected together and then there are 21 cathodes to control. 
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US$2.23
Make your own USB connections without slicing apart a USB cable and soldering those thin wires inside. This is the 'slim' version of the DIY USB-A Male connector. It's a little more elegant because instead of snapping two pieces together the connector press-fits into the overmolding for a modern look.
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US$26.95

This is specifically designed for people who want to program Atmega328P's to turn them into Arduino bootloader chips using an AVR-ISP sketch, but it can also be used to make a 'standalone' AVR ISP programmer - so that you can program blank chips without a computer!

Delivery within 2-3 weeks
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US$6.92
When soldering small surface-mount (SMD/SMT) components, one thing you'll need is a good pair of tweezers. These are a great pair of every-day tweezers. They're anti-static, anti-magnetic and made of hard stainless steel.
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US$1.74
This is the matching connector for our 40-pin GPIO Cable (1988-ADA). By soldering this onto perf board you can run a GPIO cable from your Pi A+ or B+ to the socket.
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US$8.67
Each strand comes with 12 LEDs, approximately 5cm/2 inches apart for a 2 foot long strand of wire. At one end of the magnet wire, a double stranded-core wire is soldered on and heat-shrinked to protect it. 
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US$26.17
The Terminal Block Breakout FeatherWing kit is like the Golden Eagle of prototyping FeatherWings (eg. majestic, powerful, good-looking). To start, you get a nice prototyping area underneath your Feather, with extra pads for ground, 3.3V and SDA/SCL. Not one to stop there, we expanded the PCB out to 2" x 2.5" with 3.5mm pitch terminal blocks down each side. There's also four mounting holes so you can attach the breakout to your enclosure or project.
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US$17.42
Measure liquid/water flow for your solar, computer cooling, or gardening project using this handy basic flow meter.
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US$5.17
If you want to have a nice clean board (or maybe you're doing some repair) you can use this stiff-bristled brush without worries. Some people like to drip a little rubbing alcohol on their PCBs after soldering and then scrubbing to remove rosin/flux. Finally, you have the right tool for the job. About 7" long from end to end, scrubby part is 1.5" x 0.5" with 0.5" bristles.
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US$17.42

The product kit comes with: A fully tested and assembled LED backpack. Ultra-bright 4-digit 0.56" tall red seven-segment display. 4-pin header. A bit of soldering is required to attach the matrix onto the backpack but its very easy to do and only takes about 5 minutes. 

Delivery within 2-3 weeks
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