Adafruit

US$8.75
It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data.
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US$36.35
This feather is powered by our new favorite chip, the ATSAMD51J19 - with its 120MHz Cortex M4 with floating point support and 512KB Flash and 192KB RAM. Your code will zig and zag and zoom, and with a bunch of extra peripherals for support, this will for sure be your favorite new chipset.
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US$21.88
It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data.
Delivery within 2-3 weeks
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US$7.00
This socket is designed for DIP chips of up to 40 pins and up to 0.6" wide. So really, its good for any size chip you'll find. What's nice about it is it can snap into an existing circuit board or socket that is designed for a 40-pin 0.6" chip so you may not have to redesign the board! This socket is gold plated so it will last a long time.
Delivery within 2-3 weeks
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US$5.25
This is a 28 pin ZIF socket designed for programming DIP packages of integrated circuit of up to 28 pins and 0.3" wide chips.
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US$17.42
This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. While the sensor is good up to 125°C the cable is jacketed in PVC so we suggest keeping it under 100°C.
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US$7.43
This rotary encoder is the best of the best. It is a high quality 24-pulse encoder, with detents and a nice feel. It is panel mountable for placement in a box, or you can plug it into a breadboard (just cut/bend the two mechanical side tabs.) We also include a nice soft-touch knob with an arrow in it, fits perfectly and looks great.
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US$7.00
These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter.
Delivery within 2-3 weeks
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US$1.67
This power jack is designed to fit 2.1mm power plugs snugly and securely. Perfect for adding a power connector to your project. We went for the more expensive "thin pin" type which snap into breadboards or perfboards.
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US$3.50
Connect this to that with an IDC cable! This cable has 6 pins (2x3) in 0.1"x0.1" spacing. Often used for programming AVRs. 6" long with two sockets crimped onto either side, they're quite sturdy!
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US$30.95
Breathe easy with the SGP30 Multi-Pixel Gas Sensor, a fully integrated MOX gas sensor. This is a very fine air quality sensor from the sensor experts at Sensirion, with I2C interfacing and fully calibrated output signals with a typical accuracy of 15% within measured values. The SGP combines multiple metal-oxide sensing elements on one chip to provide more detailed air quality signals. This is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) and H2 and is intended for indoor air quality monitoring. When connected to your microcontroller (running our library code) it will return a Total Volatile Organic Compound (TVOC) reading and an equivalent carbon dioxide reading (eCO2) over I2C.
Delivery within 2-3 weeks
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US$3.50
Connect this to that with an IDC cable! This cable has 10 pins (2x5) in 0.1"x0.1" spacing. Often used for programming AVRs. 6" long with two sockets crimped onto either side, they're quite sturdy!
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US$2.49
If you need to connect a battery pack or wired power supply to a board that has a DC jack - this adapter will come in very handy! There is a 2.1mm DC plug on one end, and a screw terminal block on the other.
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US$2.49
If you need to connect a DC power wall wart to a board that doesn't have a DC jack - this adapter will come in very handy! There is a 2.1mm DC jack on one end, and a screw terminal block on the other.
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US$3.85
The pins are normally open (disconnected) and when the button is pressed they are momentarily closed. They come in a pack of 20, they're pretty handy so you'll want to keep them around.
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