It's another DIY smart watch project. I use STM32F103CB microcontroller which is an ARM Cortex M3 with 72mHz clockspeed, 128k flash, RTC and a lot of pins. Over SPI, an ST7735 lcd is connected which has 128x128 resolution in 1.44' lcd size. HM-11 is the bluetooth module to connect a mobile device. It is planned to use 250 mAh Lipo battery with charging circuit.