It is a very simple device for about $15. The main SoC is GX6605S. There is some limited info about this chip on C-SKY page and some technical docs at their tools repo. It communicates with a Bluetooth module TLSR8266 using UART. There is also 4MB SPI flash holding the whole bootloader called GxLoader, Linux kernel and filesystem with the main app. The last important chip is RDA5815M which handles the RF to I/Q conversion. In the future I plan to add an USB-to-Ethernet adapter and repurpose it as an cheap opensource SAT>IP server.Continue reading Hellobox B1 satellite finder teardown
Seed Studio offered me a sample device (see specs) for exchange for an article on my blog and I accepted. The device came a few weeks ago so I am fulfilling my part.
When it came, I went to their page and searched for some example code to test and I picked GitHub Stats example. The documentation is pretty good but it describes the usage with original Arduino IDE which is not my weapon of choice. Some time ago I noticed PlatformIO added support for this device so I wanted to use it.Continue reading Wio Terminal in PlatformIO
Recently I saw an interesting video about chip decapping using only hot air.
It looked quite easy so I gave it a try and indeed I managed to extract three dies without breaking them or any other problems so it was 100% successful on first try.
You can see die pictures below. From left to right: GD32F103C8T6 main die, it’s flash and MAX7219Continue reading Chip decapping using hot air
I was thinking how to automatically generate PDF schematics for my public KiCad repos without committing it to the repo itself. I managed to make Travis CI do this for me and put the output to Github Releases.
If you are interested, read on.Continue reading Using Travis CI for KiCad PDF schematic generation
My wife owns a Samsung NX-300 camera and I wanted to use it for longer periods without needing to charge batteries round and round. Unfortunately, this camera can use its microUSB port only for charging – it doesn’t work without a battery and doesn’t charge when powered on. So I had to create a dummy battery.Continue reading Adapter powered NX-300 camera
You may think this is an easy task but let’s find out. One would expect such functionality in a web interface …
… but no, it’s not there. So what’s next? Let’s hack it!Continue reading About adding a static route to my DOCSIS modem
Short guide how to recover from completely wiped eMMC in case you have full eMMC backup and a bootlog from working device.Continue reading Zidoo X8 recovery
I’m planning to use FM24CL16 EEPROMs in some projects. These are simple I2C EEPROMs but based on FRAM technology so they should last 10^14 of writes while typical 24Cxx chips only last one million. They are much cheaper on aliexpress than at my local distributor so I ordered 5pcs from this seller for about 40 cents each. Since my local distributor sells them 5 times more expensive I was a little bit suspicious if these are legit parts so I decided to test them.Continue reading Testing chinese FRAMs
I got inspired by comma.ai – it’s a HW device which will drive your car, pretty much like Tesla does but for a fraction of it’s price. For this, it needs to connect to CAN bus of your car. My current car cannot be driven by wire but it has some simple CAN buses so I decided to have a little play with one of them, just to explore the technology. Continue reading Playing with CAN bus