Description The LilyPad Arduino USB is the perfect board for e-textiles and wearables projects. It can be sewn to fabric and to power supplies, sensors and actuators with conductive thread. You can attach this board directly to your computer using only a micro USB cable. The LilyPad Arduino USB can be powered via the micro USB connection or with a 3.7V LiPo battery (connected to the JST connector on the board). Either power source is regulated down to the operating voltage (3.3V) by the on-board MIC5219. The board can be turned on and off with the on-board switch. With the switch in the ON position, the microcontroller receives power and the board runs. With the switch in the “CHG” position, the microcontroller doesn’t receive power. (This is true whether the board is powered via USB or a battery.) The board contains a MCP73831 LiPo battery charging chip. If the board is connected to both USB and a battery, the USB power will charge the battery. This is true regardless of the position of the switch. The LED above the word “CHG” lights up while the battery is being charged. The charging will stop automatically when the battery is fully charged. The power pins are as follows: The regulated 3.3V power supply used to power the microcontroller and other components on the board. This can come either from the USB connection or a battery, both via the on-board regulator. This pin is only powered when the on-board switch is in the ON position. – Ground pin. Features On Board Battery Charger and Battery connector for 3.7V rechargeable Lithium battery Power ON/OFF Slide switch Standard USB micro connector for programming and debugging 3.3v operating voltage and 3.3V IO level 8MHz Clock Pre-burned Arduino booloader LED on digital pin 13 I2C/TWI (SDA, SCL) inerface External Interrupt (on digital pins: 2, 3), interface PWM outputs (on digital pins: 9, 10, 11, and 13) Analog Inputs (on analog pins: A2, A3, A4) 1K EEPROM, 32KB Flash ROM and 2.5KB RAM Technical Specifications Warning: Lilypad USB has 3.3V IO level. Intrefacing with 5V devices will require level translator Microcontroller ATmega32u4 Operating Voltage 3.3V Input Voltage 3.8V-5V Digital I/O Pins 9 PWM Channels 4 Analog Input Channels 4 DC Current per I/O Pin 40 mA Flash Memory 32 KB (ATmega32u4) of which 4 KB used by bootloader SRAM 2.5 KB (ATmega32u4) EEPROM 1 KB (ATmega32u4) Clock Speed 8 MHz Document and Downloads EAGLE files: arduino-lilypad-usb-reference-design.zip Schematic: Arduino-Lilypad-USB-schematic.pdf Arduino Lilypad USB Product support page Package Includes 1x Arduino Lilypad USB- Atmega32U4 3.3V 8MHz
