The LilyPad SimpleSnap is a new, easy way to create e-textiles projects with LilyPad that are modular and can be disassembled or broken down. The SimpleSnap includes a built-in rechargeable Lithium Polymer battery and female snap connectors.
Overview
The LilyPad Arduino SimpleSnap was designed and developed by Leah Buechley and SparkFun Electronics.
Technical Specs
| Microcontroller | ATmega328 |
| Operating Voltage | 2.7-5.5 V |
| Input Voltage | 2.7-5.5 V |
| Digital I/O Pins | 9 |
| PWM Channels | 5 |
| Analog Input Channels | 4 |
| DC Current per I/O Pin | 40 mA |
| Flash Memory | 32 KB (of which 2 KB used by bootloader) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Clock Speed | 8 MHz |
| Radius | 18 mm |
Documentation
The board can be turned on and off with the on-board switch. When the board is unplugged from an FTDI adapter and powered via its on-board battery, the switch turns the board on and off; with the switch in the ON position, the microcontroller receives power and the board runs and with the switch in the OFF position, the microcontroller doesn’t receive power. When the board is powered via an FTDI adapter, the board remains on all of the time; with the switch in the ON position, the microcontroller receives power from the battery and with the switch in the OFF position, the microcontroller receives power from the FTDI adapter.
The LilyPad SimpleSnap has fewer inputs and outputs than the LilyPad Arduino Main Board. There are a total of 9 I/O pins on the SimpleSnap board, one exposed pin for +5VDC, and one pin for ground.
- PWM: 5, 6, 9, 10, 11 Provide 8-bit PWM output with the analogWrite() function.
- Analog Inputs: A2-A5. The LilyPad Arduino SimpleSnap has 4 analog inputs, labeled A2 through A5, all of which can also be used as digital I/O. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using theanalogReference() function.
Rather than requiring a physical press of the reset button before an upload, the LilyPad SimpleSnap Arduino is designed in a way that allows it to be reset by software running on a connected computer. The bootloader can also be initiated by pressing the reset button on the LilyPad Arduino SimpleSnap.
The LilyPad Arduino SimpleSnap is a circle, approximately 50mm (2″) in diameter. The PCB is .8mm (1/32″) thick (approximately 3mm (1/8″) where electronics are attached).
Because of the built in battery, you cannot wash the LilyPad Arduino SimpleSnap. It will ruin the board and battery if you do. Instead, you should detach the LilyPad before carefully hand-washing the rest of your project.