Android app download bluetooth 404kb
STM32F411RE - High-performance access line, ARM Cortex-M4 core with DSP and FPU, 512 Kbytes Flash, 100 MHz CPU, ART Accelerator, STM32F411RET6TR, STM32F411RET7, STM32F411RET6, STMicroelectronics This project will help you to hack your doorbell to send Push notification and an email with an attached picture when somebody’s at the door.