This year in local Hackerspace in Gdańsk there was a series of meetups about Open Source related topics. I participated in one of them - IoT workshop about The Things Network and LoRaWAN by Inżynier Domu.
To be short: LoRaWAN is an open network for IoT devices which provides possibility to communicate eg. with a server side application. Interesting standard, but unfortunately not so popular in Poland yet (only one gateway in hs range - at Gdansk University of Technology).
Links to remember:
http://www.inzynierdomu.pl/lora-i-lorawan-czesc-1/
http://www.inzynierdomu.pl/lora-i-lorawan-czesc-2/
Photos from: https://www.facebook.com/pg/hackerspacetrojmiasto/posts
Pokazywanie postów oznaczonych etykietą embedded systems. Pokaż wszystkie posty
Pokazywanie postów oznaczonych etykietą embedded systems. Pokaż wszystkie posty
czwartek, 5 września 2019
czwartek, 15 lutego 2018
Nixie clock #3 - NodeMCU & auto time update
Previous post: Nixie clock #2
Recently I finished my clock (electronics). All the code is uploaded on my github profile: clock repo.
I added automatic time update done by NodeMCU which connects to my predefined WiFi Access Point and after receiving the time, sends it over UART to the atmega microcontroller.
Spaghetti for testing and results:
Now I should design a case for this device...
Recently I finished my clock (electronics). All the code is uploaded on my github profile: clock repo.
I added automatic time update done by NodeMCU which connects to my predefined WiFi Access Point and after receiving the time, sends it over UART to the atmega microcontroller.
Spaghetti for testing and results:
Now I should design a case for this device...
wtorek, 2 stycznia 2018
Connect to the bluetooth serial port in linux
From time to time I use my bluetoth module HC-05 to communicate with microcontroller. Every time I have the same problem because I don't remember how to do that. Short receipe working for me (at least for openSUSE):
/dev/rfcomm0 is ready to use now.
source
sudo bluetoothctl
power on
agent on
scan on
pair <MAC>
sudo killall rfcomm
sudo rfcomm connect /dev/rfcomm0 <MAC> 1
/dev/rfcomm0 is ready to use now.
source
poniedziałek, 10 kwietnia 2017
SeniorITy Code powered by Sii - Embedded
Two weeks ago I participated in meeting where shortly were preseted different security aspects of the embedded systems.
First talk was a introducion into C++11 for beginners. Next two were about safety and security of embeddes systems. Part about safety was focused on developing standards for increase of a quality of the final system (eg. restrictions in memory management).
Last part was the most interesting in my opinion. Many methods of systems analysis were metioned - including copying of the architecture techniques. It is a real problem when it is that simple to reconstruct the net list from photos of a circuit using tools like degate. To watch how the device is working there are methods called side channel attacks. Attacker can observe properties such as power usage, processing time, temperature or electro magnetic emissions to get knowledge about computations inside a chip. Other kind of attacks are state modifications. Using laser beam it is possible to change memory registers (but not single bit) which can be used to introduce changes in the code execution. Other methods are: overheating what leads to skiping instructions in some processors or changing voltage level to change signal interpretation (high/low state).
Links:
Sri Parameswaran, Tilman Wolf - Embedded systems security—an overview
First talk was a introducion into C++11 for beginners. Next two were about safety and security of embeddes systems. Part about safety was focused on developing standards for increase of a quality of the final system (eg. restrictions in memory management).
Last part was the most interesting in my opinion. Many methods of systems analysis were metioned - including copying of the architecture techniques. It is a real problem when it is that simple to reconstruct the net list from photos of a circuit using tools like degate. To watch how the device is working there are methods called side channel attacks. Attacker can observe properties such as power usage, processing time, temperature or electro magnetic emissions to get knowledge about computations inside a chip. Other kind of attacks are state modifications. Using laser beam it is possible to change memory registers (but not single bit) which can be used to introduce changes in the code execution. Other methods are: overheating what leads to skiping instructions in some processors or changing voltage level to change signal interpretation (high/low state).
Links:
Sri Parameswaran, Tilman Wolf - Embedded systems security—an overview
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