Adafruit

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US$57.83
This Feather microcontroller comes with Bluetooth Low Energy and native USB support featuring the nRF52840! This Feather is an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB plus battery charging. With native USB it works great with CircuitPython, too.
Delivery within 2-3 weeks
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US$36.35
This chip has twice the flash, and four times the SRAM of its earlier sibling, the nRF52832 - 1 MB of FLASH and 256KB of SRAM. Compared to the nRF51, this board has 4-8 times more of everything. For this chip, we've added Arduino IDE support - you can program the nRF52840 chip directly to take full advantage of the Cortex-M4 processor, and then calling into the Nordic SoftDevice radio stack when you need to communicate over BLE. Since the underlying API and peripherals are the same for the '832 and '840, you can supercharge your older nRF52832 projects with the same exact code, with a single recompile!
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US$59.10
Get a CLUE here at Adafruit by picking up this sensor-packed development board. We wanted to build some projects that have a small screen and a lot of sensors. To make it compatible with existing projects, we made it the same shape and size as the BBC micro:bit and with the same edge-connector on the bottom with 5 big pads so it will fit into your existing robot kit or 'bit add-on.
Delivery within 2-3 weeks
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US$4.54
Unlike the 'classic' Raspberry Pi computers, you can't really stick a HAT, bonnet, pHAT or other accessory/add-on on top...what to do? Give up!? NO! Use this cable, which will act as an extender for all 40 pins to give you a stretch of about 150mm / 6 inches. Simply plug the socket side into the Raspberry Pi with the white mark next to the Pin 1 label. Then on the other side, plug the hat down onto the plug side.
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US$3.17
Give yourself a lift with this 2x20 female socket header that has slightly longer than usual pins. You can plug this into your Raspberry Pi GPIO port and then plug a HAT or Bonnet or Phat on top. Especially useful for Bonnets that have slim headers on the bottom, but you want them to clear some of the components on the Pi, or fit into a case nicer.
Delivery within 2-3 weeks
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US$9.05
This little buck converter based on the MPM3610 is a marvel, taking up to 21V input and providing a 5V output with up to 1.2A current. It's great for supplying power to popular 5V voltage circuits from a range of battery or power options.  This chip provides up to 1.2 Amp load current across the entire input voltage range of 6V to 21V. The high voltage range is what sets this buck converter apart from most!
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US$1.80
Both ends have a JST PH 2mm pitch 2-pin plug. Between the two, 100mm of color coded wire - red for power, black for ground. No more soldering two pig-tails together!
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US$17.17
The LIS331HH is capable of measuring ±6g/±12g/±24g on each of its three axes! Compare that with most other accelerometers such as the LIS3DH, which can only handle ±2g/±4g/±8g/16g.
Delivery within 2-3 weeks
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US$10.45
This absolute pressure sensor, ST LPS22HB (a.k.a LPS22) can quickly and easily measure this air pressure, useful when you want to know about the weather (are we in a low-pressure or high-pressure system?) or to determine altitude, as the air thins out the higher we get above sea level.
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US$57.95
Add motion, direction and orientation sensing to your project with this all-in-one 9-DOF sensor that is STEMMA QT ready for easy plug-n-play usage. Inside the chip are three sensors, one is a classic 3-axis accelerometer, which can tell you which direction is down towards the Earth (by measuring gravity) or how fast the board is accelerating in 3D space.
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US$10.45
Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. And finally, we have some that have a true I2C interface for easy reading. The SHTC3 sensor has an excellent ±2% relative humidity and ±0.2 °C accuracy for most uses. Unlike some earlier SHT sensors, this sensor has a true I2C interface on address 0x70.
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US$27.25
This fully-assembled pan-tilt kit is the perfect way to give your project full range motion with two micro servos. The pan-tilt can rotate roughly 180° from side-to-side and can tilt up&downwards around 150°. It also comes fully assembled with two Micro Servos (SG-90 or SG-92 type) included and a 38mm x 36mm space to mount a camera or sensor or whatever you like.
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US$7.49

Compatible with both male and female wires, these fully customizable wire housings bring DIY to a new level, giving you near limitless options when using jumper wires in your project. This is a pack of small, dual row housings. This pack includes: 5 x 2x2 housing, 5 x 2x3 housing, 5 x 2x4 housing, 5 x 2x5 housing, 5 x 2x6 housing. 

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US$5.75
Comes with a USB A socket on one end and a USB A plug on the other. In between is an in-line switch that is rated for 2 Amps. The data lines are not connected through - this is a ground/5V power switch only! The switch is on the positive 5V line.
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US$5.99
For the easiest way possible to measure twists, turn to this STEMMA potentiometer breakout (ha!). This plug-n-play pot comes with a JST-PH 2mm connector and a matching  JST PH 3-Pin to Male Header Cables - 200mm, so wiring up is a cinch.
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