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Rooting the Xiaomi STYJ02YM (viomi-v7) Vacuum Robot

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microUSB port Opening the battery case My motivation to get root access is to have a talking and blinking robot that can move through my flat and is independent of any cloud. Whatever your reasons, so far it’s not supported by dustcloud, although I already added support to python-miio which allows to remote control most functionality through a python cli. Luckily, it turns out not to be too hard to get root access (all this is with the 3. Read More...

Programming the EPM240 devboard on Linux

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The supposedly simple task of programming a simple Altera CPLD took me a few days to resolve. Here’s what I learned. There’s no Open Source toolchain for Altera. So you must download the multi-GB Quartus Lite software. After installation, I followed the My First FPGA tutorial which mostly worked ok (apart from the ‘Megawizard Plug-in Manager’ thing). Pin mappings are of course different, but I found the schematic for the EPM240 minimal development board. Read More...

Verkehrsprojekt Deutsche Einheit Nr. 8: So ändern sich die Reisezeiten

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Reisezeitänderungen von München Dass die Verbindung München-Berlin schneller wird, haben alle mitbekommen, aber was heißt das für den Rest? Der Vergleich der alten mit den neuen Reisezeiten von München aus, macht einem sofort klar, dass das Verkehrsprojekt Deutsche Einheit seinem Namen alle Ehre macht. Praktisch jede Reise die in den neuen Bundesländern beginnt oder endet profitiert von schnelleren Verbindungen. Im folgenden eine interaktive Karte. Im Menü lässt sich einer von 8 Startbahnhöfen auswählen. Read More...

Reducing NodeMCU power consumption

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The ESP8266 is supposed to consume only 20μA in deep sleep mode, making it totally awesome for sensor projects that sleep most of the time and then upload their data using wifi. I use the NodeMCU v3 (Lolin) for prototyping, but when I want to attach it to a battery it quickly drains. After some experimentation (and reading a related blogpost about battery powering the NodeMCU v2) I found two reasons: Read More...

esp-stlink: free SWIM implementation for the ESP8266

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STM8S chips are probably the cheapest microcontrollers that you can get. A single chip from ~20¢, or on a board with pins, a button and LED ~60¢. Can’t really beat that. There’s an OK toolchain for development on Linux consisting of the small devices c-compiler (sdcc) and stm8flash, a free driver to work with the proprietary stlink devices which you needed until now to be able to flash STM8S MCUs. Read More...

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