Smart shirt microcontroller

The whole smart shirt electrical circuit is designed mainly considering multiconnection of ultrasonic sensors as discussed in Section 3.3.1.4. Therefore, the schematic circuit concept of vibration motors, ultrasonic sensor, and microcontroller will first be introduced and then the schematic diagram of the whole smart shirt circuit will be given in detail. 

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. 

Finally, a smart shirt with its removable parts is shown in Fig. 3.13. Sensors are positioned in front of the garment under the breast zone. Vibration motors are positioned over the wrist and hip bone area of the garment. Microcontroller and batteries are positioned along the vertical centerline of the garment. 

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. 

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