HOWTOs

HOWTOs

Crypto Wallet Recovery

Crypto Wallet Recovery

Thousands of BITCOINS, ETHER and Tokens are lost in wallets all around the globe. There can happen a lot of things which lead to not be able to access your funds. But, in some cases it is still possible to recover these dead wallets!

Don't use any kind of information provided on this page for illegal activities!

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137 MHz BP Filter and Noise Source analysed with RTL-SDR Dongle

 I need a 137 MHz bandpass filter for my little NOAA weather satellite receiver, so like anything else, you can find what you want on the internet. So there is no need for another copy of a copy of an article, but I like to keep thoughts and information buzzing around in my head together at some place.

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How to switch on and off your 3d printer with your Raspberry Pi

There are several methods of how to switch your printer on and off with your Raspberry Pi. I picked out 3 of them.

  • 433MHz transmitter connected to one GPIO pin to control wireless power sockets
  • Relay module connected to GPIO pins, for each relay one GPIO pin, self-made main voltage wiring
  • TCP/IP based power switch sockets

 A simple solution is to use a 433Mhz transmitter to control these cheap wireless power sockets. You don't have to handle around with main voltage wires and other dangerous things. You can just connect the small module to your RPi and download a ready to build tool which does all the work for you. But in this situation, it can be possible that your neighbor or some script-kiddies switch on or off your printer and may cause damage to your printer, your flat/house or your life.

 This will not happen if you use a relay module which is directly connected to your RPi. But therefore you have to do all of the connections for the main voltage by yourself and that should only be done by people who know what they are doing! You will risk your life and also your insurance coverage!

 The safest way will be to use a TCP/IP based wireless power socket. You don't have to do any wiring and don't have to be afraid of neighbors or script-kiddies. But I don't own one of these so you will find no more information about these kind of sockets in this article.

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After years of developing the install- and build-processes in ROS have changed a bit. So here I want to explain how you can easily install Ubuntu and ROS on your Raspberry PI 3+. If you want to use a desktop on your RPi it is necessary to use a swap file to extend the 1GB memory. This will increase the aging process of your SD-card in a significant way!

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Setting up OctoPrint on a Raspberry Pi for multiple printers

OctoPrint for multiple printers and webcams

In this article, I will describe how to setup OctoPrint based on OctoPi on a Raspberry Pi 3 for multiple printers. For every printer, a separate OctoPrint instance with a different port must be started. If you want to use more than one webcam, you also have to start separate instances of MJPG-Streamer for each webcam. I have also added a link to another article where I give a short overview of how you can switch on and off your printers with the use of an n-channel relay module. First, we set up OctoPrint for just one printer and after that works, for multiple printers and webcams.

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