BBMagic MAGNETO where wires dont go

BBMagic MAGNETO is a wireless, ultra low power, BBMagic module with Bluetooth Low Energy (BLE) communication.
If near magnetic field appears or disappears BBMagic MAGNETO detects the change with dry reed switch and sends an information about it. Additionally the madule can measure light level and two analog signals and even read four digital pin state.

How to receive data from BBMagic MAGNETO?

Raspberry Pi zero W and Raspberry Pi 3 can receive data from BBMagic modules using bbmagic_lib library. You can get it from Download section.

Make some helpful variables and buffer for data
unsigned char bbm_buf[100] ;
int len, ret ;

Open communication
ret = bbm_bt_open(0) ;
if(ret) exit(1) ;

Check if data has been received
len = bbm_bt_read(bbm_buf) ;
If so start processing
if(len > 0)
if(bbm_buf[BBMAGIC_DEVICE_TYPE] == BBMAGIC_M_MAGNETO)
{
if(bbm_buf[BBM_MAGNETO_FLAGS] & BBM_MAGNETO_MAGNET_MASK)
printf("DOORS ARE CLOSED") ;
else printf("DOORS ARE OPEN") ;
}

Library header file (bbmagic_lib.h) defines types of data sending by BBMagic MAGNETO

Get source code of bbm_scanner application from Download section and learn how to receive and process data from all BBMagic modules !!

Pinout

How BBMagic MAGNETO works?

Every time magnetic field appears or disappears near the BBMagic reed switch it sends information through Bluetooth Smart radio link.
If there is no magnetic field change BBMagic MAGNETO sends ‘ALIVE’ message. ‘ALIVE’ messages sending period can be configured at module startup – read below how can you do that.

BBMagic MAGNETO modes of operation

How to set/change working mode

• turn off the power of the module
• push configuration button
• turn on BBMagic power holding the button pressed
• hold the button pressed while LED flashing: 1 flash – work mode = 1, 2 flashes – work mode = 2, etc.
• release the button
• LED turns off for about 2 seconds and then flashes few times, depending on configured work mode: 1 flash – configured mode = 1, 2 flashes – configured mode = 2, etc.

Every time you turn BBMagic MAGNETO power on onboard LED flashes:

• 1 time – the module works mode is 1 – ‘ALIVE’ message period is 30 seconds
• 2 times – the module work mode is 2 – ‘ALIVE’ message period is 1 minute
• 3 times – the module work mode is 3 – ‘ALIVE’ message period is 3 minutes
• 4 times – the module work mode is 4 – ‘ALIVE’ message period is 5 minutes

Additional BBMagic MAGNETO functions

• Light level measurement – with 10k photoresistor – value range: 0 to 255
• Two ADC channels with range from 0 to 1,8V
• Four GND-active digital inputs – pulled up to power supply 10ms before sampling
• Battery monitoring – continuous supply voltage measurement
• Chip temperature measurement – After callibration can be interpreted as low accuracy ambient temperature
• Data transfer LED indication – pin 2 configurable

Wireless Bluetooth Smart

• Bluetooth Smart also called as Bluetooth Low Energy
• Transferring data is encrypted and signed with AES-128
• Direct communication with Raspberry Pi Zero W and Raspberry Pi 3 (both have Bluetooth Low Energy onboard chip)
• Library for easy programming

Powering

• 3V CR2032 battery – onboard pads for battery holder: 21 (+) and 22 (-)
• 2 x 1,5V AA or AAA batteries – onboard pins for wires soldering: 7 (+) and 8 (-)
• 2 x 1,2V NiCd or NiMH rechargeables – onboard pins for wires soldering: 7 (+) and 8 (-)
• any source you want within 1,8V to 3,6V – connect to pins 7 (+) and 8 (-)
• with voltage regulator – connect ‘+’ to 10, and ‘-‘ to 22, 23 or 24. Onboard pads 7,8,9 for TO-92 voltage regulator (ex. L78L33, TS2950CT-3.3, LP2950CZ-3.3RAG, MCP1702-3302E, LM2936Z-3.3, LT1121CZ-3.3). Learn more about voltage reg here: Power it easy: BBMagic METEO Bluetooth Low Energy module