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Oh so adorable, this is the tiniest little lipo charger, so handy you can keep it any project box! Its also easy to use. Simply plug in the gold plated contacts into any USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. There are two LEDs - one red and one green. While charging, the red LED is lit. When the battery is fully charged and ready for use, the green LED turns on. Seriously, it could not get more easy.

Charging is performed in three stages: first a preconditioning charge, then a constant-current fast charge and finally a constant-voltage trickle charge to keep the battery topped-up. The charge current is 100mA by default, so it will work with any size battery and USB port. If you want you can easily change it over to 500mA mode by soldering closed the jumper on the back, for when you'll only be charging batteries with 500mAh size or larger.

Intel Curie TinyTILE Dress: Accelerometer + Optical Fibers
Intermediate
  • 379
  • 10

Full instructions

A dress using Intel Curie accelerometer on TinyTILE and its small form factor to control colors of the optical fibers with arm movements.

Arduino-Powered Water Bottle
Intermediate
  • 3,694
  • 24

Full instructions

A water bottle that can keep track of your water intake and reminds you to drink enough water.

Simple FM Radio
Easy
  • 10,974
  • 11

Full instructions

Simple FM radio based on RDA5807M module and Arduino pro-mini 3.3V.

Adafruit Trinket Color/Mode
Intermediate
  • 650
  • 10

Full instructions

This simple build will help to add some LED color to any project.

RGB LED Nightlight
Easy
  • 410
  • 7

Full instructions

Motion sensing, battery powered, pulsing RGB LED nightlight without a microcontroller

eNVIRO sense: wireless temperature & humidity sensor
Advanced
  • 2,066
  • 14

Work in progress

Professional quality wireless weather station.

Touched by Time – Cyborgism
Advanced
  • 1,680
  • 16

I have no “sense" of time - can I develop one? Tempo is a wearable device that feeds time data to my skin through vibration patterns.

Baby Room Starscape Projector
Easy
  • 449
  • 6

Thanks to the FastLED library and a USB-powered Arduino-LED board this project transforms a $10 toy into endless entertainment!

Knock To Open Treasure Chest
Intermediate
  • 875
  • 4

Treasure chest to store your most valuable things. You can only open it when you know the secret knock code.

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