Using Python to store data from many BLE devices


Erich Styger has written an article describing a technique he used to collect and store data from several BLE devices with Raspberry Pi and Python scripting:

BLE (Bluetooth Low Energy) sensor devices like the Hexiwear are great, but they cannot store a large amount of data. For a research project I have to collect data from many BLE devices for later processing. What I’m using is a Python script running on the Raspberry Pi which collects the data and stores it on a file

More details at

Things to avoid when sending PCBs to the fab house


Sjaak shared some tips when sending PCBs to the fab house:

I usually collect a few PCB designs before sending them off to the PCB fabhouse. I prefer to use as I know Ian from for a long time and think he provides good quality, and fast turn around time for your money. Also tend to be loyal to my suppliers so a better alternative may exist. The main reason I wait before sending them off is that I want my PCBs returned quickly. DirtyPCBs provide fast DHL shipping (about 2-3 days to .nl) but it is quite expensive (about 30 USD) compared to the manufacturing the PCBs. Luckily the PCBs don’t weight a ton, and adding more designs will not add much additional shipping costs.

More details at site.