BBMagic MOTION is ultra low power PIR sensor with Bluetooth Low Energy (BLE) – Bluetooth Smart. It can be powered from little coin battery only.
Passive Infra Red (PIR) technology allows detecting radiation from all objects with temperature above absolute zero.
BBMagic MOTION functions
- PIR motion detection ; angle: 120 degree ; range: 4-5m
- Light level measurement – pads for 10k photoresistor – values range: 0 to 255
- Two ADC 0 to 1,8V channels with 1mV resolution
- Battery monitoring by continuous supply voltage measurement
- Motion detection LED indication – pin 2 configurable
- Communication: encrypted and digital signed Bluetooth Smart messages
How to do objects detection using BBMagic MOTION
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.
Its very easy:
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[BBM_MOTION_FLAGS] & BBM_MOTION_ALERT_MASK)
{
printf(" OBJECT DETECTED !!") ;
}
Library header file (bbmagic_lib.h) defines types of data sending by BBMagic MOTION
| bbm_buf[BBMAGIC_DEVICE_TYPE] | module type ; here is BBMAGIC_M_MOTION |
| bbm_buf[BBM_MOTION_FLAGS] | most significant bit is motion detection flag – BBM_MOTION_ALERT_MASK |
| bbm_buf[BBM_MOTION_V_SUP] | supply voltage ; divide this value by 71 (BBMAGIC_VCC_DIVIDER) to have power supply voltage in volts |
| bbm_buf[BBM_MOTION_CHIP_TEMP] | BBMagic chip temperature in Celsius (U2 encoded) – After callibration this value can be interpreted as low accuracy ambient temperature |
| bbm_buf[BBM_MOTION_LIGHT] | light level ; from 0 to 255 |
| bbm_buf[BBM_MOTION_ADC_1_MSB] bbm_buf[BBM_MOTION_ADC_1_LSB] | voltage level on ADC_1 input in mV |
| bbm_buf[BBM_MOTION_ADC_2_MSB] bbm_buf[BBM_MOTION_ADC_2_LSB] | voltage level on ADC_2 input in mV |
| bbm_buf[BBM_MOTION_WORKTIME_0] | amount of time from module power up – in seconds ; byte 0 – LSB |
| bbm_buf[BBM_MOTION_WORKTIME_1] | amount of time from module power up – in seconds ; byte 1 |
| bbm_buf[BBM_MOTION_WORKTIME_2] | amount of time from module power up – in seconds ; byte 2 |
| bbm_buf[BBM_MOTION_WORKTIME_3] | amount of time from module power up – in seconds ; byte 3 – MSB |
| bbm_buf[BBM_MOTION_FIRM_0] | module firmware version LSB |
| bbm_buf[BBM_MOTION_FIRM_1] | module firmware version MSB |
| bbm_buf[BBMAGIC_DEVICE_ADDR_0] | module address byte 0 – LSB |
| bbm_buf[BBMAGIC_DEVICE_ADDR_1] | module address byte 1 |
| bbm_buf[BBMAGIC_DEVICE_ADDR_2] | module address byte 2 |
| bbm_buf[BBMAGIC_DEVICE_ADDR_3] | module address byte 3 |
| bbm_buf[BBMAGIC_DEVICE_ADDR_4] | module address byte 4 |
| bbm_buf[BBMAGIC_DEVICE_ADDR_5] | module address byte 5 – MSB |
| bbm_buf[BBMAGIC_DEVICE_RSSI] | radio signal strength indicator in dBm |
Pinout
| Pin number | Description |
|---|---|
| 1,8,20,22,23,24 | GND – power and signal ground |
| 2 | Configuration of object detection indication:
Consider that switching LED indication on causes more power need. |
| 5-6 | Pads for alternative LED with series resistor. Pad 6 – LED anode with resistor, Pad 5 – LED cathode |
| 7,21 | Supply voltage 2,7V – 3,3V |
| 21,22 | Pads for CR2032 battery holder: 21 (+) i 22 (-) |
| 7,8,9 | Pads for voltage regulator if you decide to power BBMagic MOTION this way. Its identical like BBMagic METEO described here: Power it easy: BBMagic METEO Bluetooth Low Energy module |
| 10 | Supply voltage input for voltage regulator. Its identical like BBMagic METEO described here: Power it easy: BBMagic METEO Bluetooth Low Energy module |
| 11,12 | 10k photoresistor pads |
| 13,14 | Inputs of analog to digital converter ADC_1 and ADC_2. Available voltage range: 0V-1,8V ; Resolution: 1mV |
| 18,19 | Tx and Rx UART lines. Available voltage range: 0V-5V |
How does BBMagic MOTION work?
When object appears in its field of view BBMagic MOTION sends message immediately via Bluetooth Low Energy radio link.
Then there is no object detection through 10 seconds after which detection starts again.
Wireless communication
- Bluetooth Low Energy also called as Bluetooth Smart
- Transferring data is encrypted and signed with AES-128
- You can collect and process data with Raspberry Pi, Arduino, etc.
- 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 (-)
- any source you want within 2,7V to 3,3V – 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
