In this post I finish the presentation of components of used equipments.
Compared to the other Arduino boards, the Arduino Micro was the best choice for the smart clothes. It is based on the 8-bit ATmega32u4 microcontroller with 16 MHz clock speed. It has 12 analog inputs and 20 digital input/output pins of which 7 can be used for pulse-width modulation (PWM) outputs. After the filtering, the PWM output can be operated as analog output. The amount of available memory is 32 KB. It is a well-equipped devices with tiny size: 17,8 · 48,3 mm.
Because of the sustainable development and green aspects, I decided to use rechargeable batteries for the power supply. Types of AA and PP3 were used.
The Ag/AgCl electrodes with foam tape has been selected for the ECG measurement.
The light emitting diodes (LEDs) are based of the active lighting system. The features of the applied items have varying luminous intensity (1-23,5 cd), almost the same forward voltage (1,85-2,1 V) and identical forward current (20 mA).
To detect the ambient light to change, the light dependent resistors (LDRs) has been selected. The resistance are between 5 kΩ and 20 MΩ.
JY-MCU Bluetooth module are the selected device for the wireless communication between the developed system and smart phone.