Measurements without miles of wires? BBMagic METEO Bluetooth LE

When the Raspberry Pi wants to measure temperature, humidity and light level:

…but is it possible to simplify something ? ? ? Like this:

Lets use Bluettoth Low Energy technology. Lets make things simpler and wireless:

1. What will we need?
• Raspberry Pi zero W or Raspberry Pi 3 (both have Bluetooth Low Energy chip onboard) with the operating system installed. Want to know how to instal OS easy? Go: Quick system installation on Raspberry Pi
• BBMagic METEO
• CR2032 battery with holder
• 10k photoresistor



• And a tasty little cookie 🙂



2. Lets prepare hardware and software
• Solder battery holder and photoresistor, install CR2032 battery and the hardware is ready.



• Download bbm_logger_1.0 software from Download section. In text mode simply write: wget http://bbmagic.net/download/bin/bbm_logger_1.0
• Change bbm_logger_1.0 file permissions: chmod 755 bbm_logger_1.0
• To get more info about soft type: ./bbm_logger_1.0 h
• Congratulation !! Work almost done !! Eat your cookie 🙂



3. Lets launch bbm_logger
• If launched: sudo ./bbm_logger_1.0 – it will only display received data
• If launched: sudo ./bbm_logger_1.0 f – received data will be log to files too
• If launched: sudo ./bbm_logger_1.0 l26 – it will switch on LED indication on pin 26 of Raspberry Pi. LED will blink during Bluetooth transmission

It is possible to use both ‘f’ and ‘lxx’ flags.
To exit bbm_logger press ‘ctrl+c’.


4. Log file names from BBMagic METEO
Example file name is: ‘bbmeteo_CBFD786BAA68_18-01-03_133259.txt’
• CBFD786BAA68 – BBMagic module address
• 18-01-03 – log starting date: year, month, day
• 133259 – log starting time: hour, minute, second



5. Processing data
Data in log files are separate with commas. From left we have:
• day of the week – from Raspberry Pi settings
• date – from Raspberry Pi settings
• time – from Raspberry Pi settings
• temperature in Celsius – received from BBMagic METEO
• relative humidity in %RH – received from BBMagic METEO
• light level from 0 to 255 – received from BBMagic METEO
• ADC1 input voltage in Volts – received from BBMagic METEO
• ADC2 input voltage in Volts – received from BBMagic METEO
• digital inputs state – hex four bits – received from BBMagic METEO
• BBMagic METEO power supply in Volts – received from BBMagic METEO
• Bluetooth Radio Signal Strength Indicator in dBm – from Raspberry Pi
• BBMagic METEO work time from power up in seconds – received from BBMagic METEO



6. Drawing the charts