Lilypad Arduino

In addition to the sensors, other electronic elements are necessary for pregnancy monitoring. These include low-power amplifiers, processing units, and radios to transmit the data to a personal device. Nowadays, these are stiU hard elements soldered to printed circuit boards (PCBs), which can be sewn into the garment. An example is the Lilypad Arduino (Arduino, 2007), which is a microcontroller board designed especially for use with wearables. The board connection pins are holes that can be sewn... 

Buechley, L., LilyPad Arduino. LilyPad Arduino. Available at http //lilypadarduino.org/ (accessed 10.05.13). 

The LilyPad Arduino microcontroller board is used. The LUyPad Arduino has a circle shape, approximately 50 mm in diameter. The thickness of the board itself is 0.8 mm, and with the attached electronics it is approximately 3 mm. The LilyPad Arduino can be powered via USB connection or with an external power supply. In smart shirt circuit design, it is powered with a 4.8 V NiMH flat battery. The board is based on ATmega328 [8]. The schematic diagram of the board is shown in Fig. 3.7. 

In the smart shirt system, the Lilypad Arduino microcontroller board is used. The board is based on ATmega328 (20 MHz, 6-channel 10-bit ADC, 14-channel programmable input/output lines) for which the instruction set and technical specifications of the chip are given in the ATMEL Technical Data Manual [14], In order to program the microcontroller, Arduino developed a C-based software. Thus, in this study Arduino s own software is preferred against assembly language due to easy programming. 

Figure 3.7 Schematic diagram of LilyPad Main Board microcontroiier. http //arduino.cc/en/uploads/Main/LilyPad schematic vl8.pdf, (accessed on February 2011).

Adafruit s GEMMA miniature wearable PCB Lilypad XBEE radio transceiver for wireless wearables Arduino generic PCBs for Bluetooth, Zigby, and RF applications Inventables offers preprogrammed LED drivers with standard routines Mouser offers the Winbond, PIC chip, and other microprocessors. 

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