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2011-ADA Lithium Ion Battery - 3.7v 2000mAh
US$21.88
Lithium ion polymer batteries are thin, light and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 2000mAh. If you need a larger (or smaller!) battery, we have a full range of LiPoly batteries.
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3141-ADA Premium Female/Female Raw Custom Jumper Wires - 40 x 6" (150mm)
US$5.17
Our Raw F/F Jumper Wires are perfect for making custom jumper wire sets for wire harnesses or jumpering between headers on PCB's. These premium jumpers are a little over 6" (150mm) long and come in a 'strip' of 40 (4 pieces of each of the ten colors).
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1782-ADA MCP9808 High Accuracy I2C Temperature Sensor Breakout Board
1782-ADA MCP9808 High Accuracy I2C Temperature Sensor Breakout Board
US$7.63
This I2C digital temperature sensor is one of the more accurate/precise we've ever seen, with a typical accuracy of ±0.25°C over the sensor's -40°C to +125°C range and precision of +0.0625°C.
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3290-ADA Platinum RTD Sensor - PT100 - 3 Wire 1 meter long
US$22.67
For precision temperature sensing, nothing beats a Platinum RTD. Resistance temperature detectors (RTDs) are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor. In this sensor, the resistor is actually a small strip of Platinum with a resistance of 100 ohms at 0°C, thus the name PT100. Compared to most NTC/PTC thermistors, the PT type of RTD is much most stable and precise (but also more expensive) PT100's have been used for many years to measure temperature in laboratory and industrial processes, and have developed a reputation for accuracy (better than thermocouples), repeatability, and stability.
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419 Membrane Matrix Keypad 3x4
419 Membrane Matrix Keypad 3x4
US$6.92
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad.
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1899-ADA Adafruit HTU21D-F Temperature & Humidity Sensor Breakout Board
1899-ADA Adafruit HTU21D-F Temperature & Humidity Sensor Breakout Board
US$26.17
It's summer and you're sweating and your hair's all frizzy and all you really want to know is why the weatherman said this morning that today's relative humidity would max out at a perfectly reasonable 52% when it feels more like 77%. Enter the HTU21D-F Temperature + Humidity Sensor - the best way to prove the weatherman wrong! 
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1335-ADA Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A
1335-ADA Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A
US$61.17
The 12V Peltier module is mounted onto a 12V heatsink and fan assembly with thermal paste and an aluminum clamp. Simply connect to 12V 5A+ power supply and you will see frost appear on the aluminum plate within a minute.
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2465-ADA PowerBoost 1000 Charger - Rechargeable 5V Lipo USB Boost @ 1A - 1000C
US$34.92
PowerBoost 1000C is the perfect power supply for your portable project! With a built-in load-sharing battery charger circuit, you'll be able to keep your power-hungry project running even while recharging the battery! This little DC/DC boost converter module can be powered by any 3.7V LiIon/LiPoly battery, and convert the battery output to 5.2V DC for running your 5V projects.
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746-ADA Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates - Version 3
US$61.52
It's got everything you want and more: -165 dBm sensitivity, 10 Hz updates, 66 channels. 5V friendly design and only 20mA current draw. Breadboard friendly + two mounting holes. RTC battery-compatible. Built-in datalogging. PPS output on fix. Internal patch antenna + u.FL connector for external active antenna. Fix status LED. New! Version 3 comes with the latest module which has external antenna support and Pulse-Per-Second output.
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1063 Electret Microphone Amplifier - MAX4466 with Adjustable Gain
1063 Electret Microphone Amplifier - MAX4466 with Adjustable Gain
US$12.17
Add an ear to your project with this well-designed electret microphone amplifier. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on.
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1762-ADA 5050 LED breakout PCB - 10 pack!
1762-ADA 5050 LED breakout PCB - 10 pack!
US$8.67
Each item comes with ten PCBs and each PCB is identical. PCB is .8mm/.03" thick, with ~10mm/0.4" spacing between the two rows.
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374-ADA DS18B20 Digital temperature sensor + extras
374-ADA DS18B20 Digital temperature sensor + extras
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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270-ADA Thermocouple Type-K Glass Braid Insulated - K
270-ADA Thermocouple Type-K Glass Braid Insulated - K
US$15.33
Features: K type thermocouple with glass over-braiding. Good up to 500 °C (900 °F)! Color-coded wires. 1 meter long (a little more than 3 feet). Best used with a thermocouple amplifier such as the MAX6675 or MAX31855. 
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385 DHT22 temperature-humidity sensor + extras
385 DHT22 temperature-humidity sensor + extras
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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1893-ADA MPL3115A2 - I2C Barometric Pressure/Altitude/Temperature Sensor
1893-ADA MPL3115A2 - I2C Barometric Pressure/Altitude/Temperature Sensor
US$15.45
This pressure sensor from Freescale is a great low-cost sensing solution for precision measurement of barometric pressure and altitude. The MPL3115A2 has a typical 1.5 Pascal resolution, which can resolve altitude at 0.3 meters (compare to the BMP180 which can do 0.17m).
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