BLE Moisture Sensor FW

Description

This repo contains the code for my BLE moisture sensor, based on the SPBTLE-1S device.

• Link to the HW repo

It's basicaly a BLE emitting beacon containing the raw value of a capacitive sensor

Build

IDE

• The project is build in Keil V5 ( License is free for Cortex-M0 devices )
• The software pack used is : Keil.STBlueNRG-1_DFP.1.2.0

Feature

• Pushbutton to power on the device with self maintained circuit
• Shutdown pin from the MCU to turn off the device
• Button input to to actions
  • Keep the device from sleeping
  • Actions TBD
• Device is always sleeping and should wakeup when timer elapsed
• Will burst advertising beacon when awake ( 100ms )

Advertising packet

• 0x02
  • Instruction is 2 bytes
  • 0x01
    • AD_TYPE_FLAGS, // Next byte will contain flags
  • 0x06
    • FLAG_BIT_LE_GENERAL_DISCOVERABLE_MODE | FLAG_BIT_BR_EDR_NOT_SUPPORTED,
• 0x07
  • Next instruction is 7 bytes
  • 0x08
    • AD_TYPE_SHORTENED_LOCAL_NAME, // Local name
  • [ 6 Bytes for the name]
    • Exemple : 'S', 'B', 'M', 'S', '0', '0',
• 0x12,
  • manufacturer specific data will contain 18 bytes

    • 0xFF

      • AD_TYPE_MANUFACTURER_SPECIFIC_DATA

    • 0xFFFF

      • Company identifier code (
        • Default is 0x0030 for STMicroelectronics
        • FFFF = No identifier

    • [ 4 bytes ]

      • Sys voltage ( mV )

    • [ 4 bytes ]

      • Sensor Value

    • [ 4 bytes ]

      • SPARE

    • [ 3 bytes ]

      • Flags ( todo )

The advertising packet should look like : 02 01 06 07 08 xx xx xx xx xx xx 12 FF FF FF xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx

MAC Address

uint8_t address[6] = { 0x00,0x00,0x00,0xE1,0x80,0x02 };
                         ^^------This is the sensor number