a proof of concept STERZO imitation based on a nrf51822 smart watch

to get going:

• modify variant.h to suit the pin layout of your smartwatch, in particular I2C for the accelerometer, and Serial TX for the Serial.prints to work
• install Arduino NRF51 board package & BLEPeripheral library
• select the device settings corresponding with the smartwatch : ram/flash (xxaa), oscillator(RC)
• hookup a ST-LINK for programming
• flash a Nordic SoftDevice (S110 works for me)
• program arduino sketch

Have a look at my repo https://github.com/stefaandesmet2003/nrf51 for more details